David Heldebrant

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352
(509) 372-6359
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Biography

Dr. David J. Heldebrant is a Chief Scientist and Team Lead of the Separations Materials team under the Advanced Energy Systems Group in the Energy Processes and Materials Division at Pacific Northwest National Laboratory. Dr. Heldebrant joined PNNL as a post-doctoral research scientist in 2005.

Research Interests

Dr. Heldebrant's current research focuses on applying the principles of Green Chemistry to improve atom and energy efficiency and reduce toxicity of chemical processes and to make energy-related process more environmentally benign. Focus areas are on developing materials that can perform multiple tasks to reduce waste and improve energy efficiency in the fields of chemical separations and chemical conversions, applying these principles in areas of industrial gas separations, liquid/liquid separations and catalysis. The work focuses on the development of organic gas-separating liquids that can chemical remove CO₂, SO_x, and H₂S from combustion, gasification or natural gas streams through applied and fundamental studies of gas absorption kinetics, thermodynamics and mechanistic studies.

Education and Credentials

Ph.D., Organic Chemistry, University of California at Davis, 2005
B.S., Fiber and Polymer Science, University of California at Davis, 2001

Affiliations and Professional Service

Member of the American Chemical Society (ACS), 2005 – present.
Chair of the Richland, WA ACS Local Section, 2012.
Alternate Councilor of the Richland, WA ACS Local Section, 2017-present.
Chair of the ACS Energy and Fuels Division, to be served in 2019

Awards and Recognitions

Pacific Northwest National Laboratory’s Ronald L. Brodzinski Award for Early Career Exceptional Achievement (2011).
Undergraduate of the year (2001) by the American Association of Textile Colorists & Chemists
Innovation Magazine: "The Best and Brightest Innovators in The Energy Labs," April/May 2010.

PNNL Patents

U.S. Patent No. 11,745,137, September 5, 2023, "DIAMINE SOLVENT SYSTEM FOR CO2 CAPTURE (iEdison No. 0685901-18-0018)".
U.S. Patent No. 11,492,302, November 8, 2022, "INTEGRATED CAPTURE AND CONVERSION OF CO2 TO METHANE, METHANOL, OR METHANOL AND GLYCOL".
U.S. Patent No. 11,266,947, March 8, 2022, "DIAMINE SOLVENT SYSTEM FOR CO2 CAPTURE (iEdison No. 0685901-18-0018)".
U.S. Patent No. 11,168,275, November 9, 2021, "ON-BOARD SEPARATION OF OXYGENATES FROM FUELS".
U.S. Patent No. 10,961,173, March 30, 2021, "INTEGRATED CAPTURE AND CONVERSION OF CO2 TO METHANOL PROCESS TECHNOLOGY".
U.S. Patent No. 10,773,205, September 15, 2020, "CAPTURE AND RELEASE OF ACID GASSES USING TUNABLE ORGANIC SOLVENTS WITH AMINOPYRIDINE ".
U.S. Patent No. 10,722,837, July 28, 2020, "CAPTURE AND RELEASE OF ACID GASSES USING TUNABLE ORGANIC SOLVENTS WITH AMINOPYRIDINE ".
U.S. Patent No. 10,456,739, October 29, 2019, " CAPTURE AND RELEASE OF ACID GASSES USING TUNABLE ORGANIC SOLVENTS WITH BINDING ORGANIC LIQUIDS ".
U.S. Patent No. 10,434,460, October 8, 2019, "CAPTURE AND RELEASE OF ACID GASSES USING TUNABLE ORGANIC SOLVENTS WITH AMINOPYRIDINE ".
U.S. Patent No. 10,179,320, January 15, 2019, "PROCESS FOR MAKING CARBON-BASED NANO-RODS FROM SWITCHABLE IONIC LIQUIDS AND DEVICES AND PROCESSES INCORPORATING SAME".
U.S. Patent No. 10,130,907, November 20, 2018, "CAPTURE AND RELEASE OF ACID GASSES USING TUNABLE ORGANIC SOLVENTS WITH AMINOPYRIDINE ".
U.S. Patent No. 9,873,828, January 23, 2018, "Electrophilic acid gas-reactive fluid, proppant, and process for enhanced fracturing and recovery of energy producing materials".
U.S. Patent No. 9,707,508, July 18, 2017, "System and Process for Polarity Swing Assisted Regeneration of Gas-Selective Capture Liquids".
U.S. Patent No. 9,447,315, September 20, 2016, "ELECTROPHILIC ACID GAS-REACTIVE FLUID, PROPPANT, AND PROCESS FOR ENHANCED FRACTURING AND RECOVERY OF ENERGY PRODUCING MATERIALS".
U.S. Patent No. 9,433,892, September 6, 2016, "SYSTEM AND PROCESS FOR CAPTURE OF ACID GASSES AT ELEVATED PRESSURE FROM GASEOUS PROCESS STREAMS".
U.S. Patent No. 8,980,210, March 17, 2015, "Capture and Release of Acid-Gasses with Acid-Gas Binding Organic Compounds".
U.S. Patent No. 8,652,237, February 18, 2014, "System and process for capture of H2S from gaseous process streams and process for regeneration of the capture agent ".
U.S. Patent No. 7,897,129, March 1, 2011, "Process for Synthesis of Ammonia Borane for Bulk Hydrogen Storage".
U.S. Patent No. 7,799,299, September 21, 2010, "Capture and Release of Mixed Acid Gasses with Binding Organic Liquids".

PNNL Publications

2024

Leclaire J., D.J. Heldebrant, K. Grubel, J. Septavaux, M. Hennenbelle, E.D. Walter, and Y. Chen, et al. 2024. "Tetrameric self-assembling of water-lean solvents enables carbamate anhydride-based CO2 capture chemistry." Nature Chemistry 16, no. 7:1160 - 1168. PNNL-SA-186388. doi:10.1038/s41557-024-01495-z
Ravula S., Y. Chen, K.W. Wise, P.S. Shinde, E.D. Walter, A.J. Karkamkar, and D.J. Heldebrant, et al. 2024. "Precisely Segmented PEEK-Ionene + Ionic Liquid Composite Membranes for CO2 Separation." Journal of Materials Chemistry A 12, no. 4:2184-2199. PNNL-SA-194694. doi:10.1039/D3TA05223K
Strange L.E., D.J. Heldebrant, S. Ravula, P. Chen, Z. Zhu, J. Bara, and J. Yao. 2024. "In-house Synthesized Poly(ether ether ketone) Ionenes. I. ToF-SIMS spectra in the positive ion mode." Surface Science Spectra 31, no. 1:Art. No. 015001. PNNL-SA-184766. doi:10.1116/6.0003132
Strange L.E., S. Ravula, Z. Zhu, J. Bara, P. Chen, D.J. Heldebrant, and J. Yao. 2024. "In-house synthesized poly(ether ether ketone) ionenes. II. ToF-SIMS spectra in the negative ion mode." Surface Science Spectra 31, no. 1:Art. No. 015002. PNNL-SA-184767. doi:10.1116/6.0003133

2023

Jiang Y., P.M. Mathias, R.F. Zheng, C.J. Freeman, D. Barpaga, D. Malhotra, and P.K. Koech, et al. 2023. "Energy-effective and low-cost carbon capture from point-sources enabled by water-lean solvents." Journal of Cleaner Production 388. PNNL-SA-176711. doi:10.1016/j.jclepro.2022.135696
Kothandaraman J., D.J. Heldebrant, J. Saavedra Lopez, and R.A. Dagle. 2023. "Mechanistic Insights to Drive Catalytic Hydrogenation of Formamide Intermediates to Methanol via Deaminative Hydrogenation." Frontiers in Energy Research 11. PNNL-SA-181662. doi:10.3389/fenrg.2023.1158499

2022

Dagle R.A., J. Kothandaraman, and D.J. Heldebrant. 2022. Integrated Capture and Conversion of CO2 to Methanol (ICCCM) Process Technology - CRADA 449 (Final Report). PNNL-33642. Richland, WA: Pacific Northwest National Laboratory. Integrated Capture and Conversion of CO2 to Methanol (ICCCM) Process Technology - CRADA 449 (Final Report)
Gao J., Y. Zhang, J. Son, J. Bara, K.E. O'Harra, M.H. Engelhard, and D.J. Heldebrant, et al. 2022. "The interfacial compatibility between a potential CO2 separation membrane and capture solvents." Carbon Capture Science & Technology 2. PNNL-SA-168831. doi:10.1016/j.ccst.2022.100037

2021

Jiang Y., P.M. Mathias, C.J. Freeman, R.F. Zheng, G.A. Whyatt, D.J. Heldebrant, and J. Swisher. 2021. "Techno-Economic Comparison of Various Process Configurations for Post-Combustion Carbon Capture Using a Single-Component Water-Lean Solvent." International Journal of Greenhouse Gas Control 106. PNNL-SA-156565. doi:10.1016/j.ijggc.2021.103279
Nguyen M., K. Grubel, D. Zhang, P.K. Koech, D. Malhotra, S.I. Allec, and R.J. Rousseau, et al. 2021. "Amphiphilic Water-Lean Carbon Capture Solvent Wetting Behavior through Decomposition by Stainless-Steel Interfaces." ChemSusChem 14, no. 23:5283-5292. PNNL-SA-163590. doi:10.1002/cssc.202101350

2020

Banuelos J.L., M. Lee, M. Nguyen, D. Zhang, D. Malhotra, D. Cantu Cantu, and V. Glezakou, et al. 2020. "Subtle Changes in Hydrogen Bond Orientation Result in Glassification of Carbon Capture Solvents." Physical Chemistry Chemical Physics 22, no. 34:19009-19021. PNNL-SA-153262. doi:10.1039/D0CP03503C
Cantu Cantu D., D. Malhotra, M. Nguyen, P.K. Koech, D. Zhang, V. Glezakou, and R.J. Rousseau, et al. 2020. "Molecular-Level Overhaul of y-Aminopropyl Aminosilicone/Triethylene Glycol Post-Combustion CO2-Capture Solvents." ChemSusChem 13, no. 13:3429-3438. PNNL-SA-152126. doi:10.1002/cssc.202000724
Heldebrant D.J., and J. Kothandaraman. 2020. "Solvent-Based Absorption." In Carbon Capture and Storage: RSC Energy and Environment Series, edited by M. Bui and N MacDowell. 36-68. Cambridge:Royal Society of Chemistry. PNNL-SA-137049. doi:10.1039/9781788012744-00036
Kothandaraman J., and D.J. Heldebrant. 2020. "Towards environmentally benign capture and conversion: Heterogeneous metal catalyzed CO2 hydrogenation in CO2 capture solvents." Green Chemistry 22, no. 3:828-834. PNNL-SA-148329. doi:10.1039/C9GC03449H
Shen Y., Y. Fu, J. Yao, D.B. Lao, S.K. Nune, Z. Zhu, and D.J. Heldebrant, et al. 2020. "Revealing the structural evolution of green rust synthesized in ionic liquids by in situ molecular imaging." Advanced Materials Interfaces. PNNL-SA-151430. doi:10.1002/admi.202000452
Zheng R.F., D. Barpaga, P.M. Mathias, D. Malhotra, P.K. Koech, Y. Jiang, and M. Bhakta, et al. 2020. "A Single-Component Water-Lean Post-Combustion CO2 Capture Solvent with Exceptionally Low Operational Heat and Total Costs of Capture - Comprehensive Experimental and Theoretical Evaluation." Energy & Environmental Science 13, no. 11:4106-4113. PNNL-SA-153508. doi:10.1039/D0EE02585B

2019

Cabral R.P., D.J. Heldebrant, and N. Mac Dowell. 2019. "A techno-economic analysis of a novel solvent-based oxycombustion CO2 capture process." Industrial Engineering Chemistry Research 58, no. 16:6604-6612. PNNL-SA-148334. doi:10.1021/acs.iecr.9b00305
Grubel K., W. Chouyyok, D.J. Heldebrant, J.C. Linehan, and J.T. Bays. 2019. "Octane-On-Demand: Onboard Separation of Oxygenates from Gasoline." Energy and Fuels 33, no. 3:1869-1881. PNNL-SA-138442. doi:10.1021/acs.energyfuels.8b03781
Heldebrant D.J., Y. Shao, P.K. Koech, and L. Yan. 2019. Integrated Capture and Electrocatalytic Conversion of Carbon Dioxide to Alcohols. PNNL-29384. Richland, WA: Pacific Northwest National Laboratory. Integrated Capture and Electrocatalytic Conversion of Carbon Dioxide to Alcohols
Kothandaraman J., J. Zhang, V. Glezakou, M.T. Mock, and D.J. Heldebrant. 2019. "Chemical Transformations of Captured CO2 into Cyclic and Polymeric Carbonates." Journal of CO2 utilization 32. PNNL-SA-139496. doi:10.1016/j.jcou.2019.04.020
Malhotra D., D. Cantu Cantu, P.K. Koech, D.J. Heldebrant, A.J. Karkamkar, F. Zheng, and M.D. Bearden, et al. 2019. "Directed Hydrogen Bond Placement: Low Viscosity Amine Solvents for CO2 Capture." ACS Sustainable Chemistry & Engineering 7, no. 8:7535-7542. PNNL-SA-139613. doi:10.1021/acssuschemeng.8b05481
Mehta H.S., Y. Chen, J.A. Sears, E.D. Walter, M. Campos, J. Kothandaraman, and D.J. Heldebrant, et al. 2019. "A Novel High-Temperature MAS Probe with Optimized Temperature Gradient across Sample Rotor for In-situ Monitoring of High-Temperature High-Pressure Chemical Reactions." Solid State Nuclear Magnetic Resonance 102. PNNL-SA-143153. doi:10.1016/j.ssnmr.2019.06.003
Zheng J., X. Yu, M. Nguyen, D.B. Lao, Y. Zhu, F. Wang, and D.J. Heldebrant. 2019. "Assessing the Impacts of Dynamic Soft-Template Innate to Switchable Ionic Liquids on Nanoparticulate Green Rust Crystalline Structures." Chemical Communications 55, no. 75:11239-11242. PNNL-SA-144215. doi:10.1039/C9CC04581C

2018

Kothandaraman J., R.A. Dagle, V. Dagle, S.D. Davidson, E.D. Walter, S.D. Burton, and D.W. Hoyt, et al. 2018. "Condensed-Phase Low Temperature Heterogeneous Hydrogenation of CO2 to Methanol." Catalysis Science & Technology 8, no. 19:5098-5103. PNNL-SA-133245. doi:10.1039/C8CY00997J
Leclaire J., and D.J. Heldebrant. 2018. "A Call to (Green) Arms: A Rallying Cry for Green Chemistry and Engineering for CO2 Capture, Utilisation and Storage." Green Chemistry 20, no. 22:5058-5081. PNNL-SA-136095. doi:10.1039/C8GC01962B
Shao H., S. Kabilan, M.I. Childers, S.A. Stephens, N. Suresh, A.N. Beck, and T. Varga, et al. 2018. "Corrigendum to "Environmentally friendly, rheoreversible, hydraulic fracturing fluids for enhanced geothermal systems" [Geothermics 58 (2015) 22-31]." Geothermics 72. PNNL-SA-134510. doi:10.1016/j.geothermics.2017.12.002
Yu X., J. Yao, D.B. Lao, D.J. Heldebrant, Z. Zhu, D. Malhotra, and M. Nguyen, et al. 2018. "Mesoscopic Structure Facilitates Rapid CO2 Transport and Reactivity in CO2 Capture Solvents." The Journal of Physical Chemistry Letters 9, no. 19:5765-5771. PNNL-SA-129707. doi:10.1021/acs.jpclett.8b02231

2017

Cantu Cantu D., D. Malhotra, P.K. Koech, D.J. Heldebrant, F. Zheng, C.J. Freeman, and R.J. Rousseau, et al. 2017. "Integrated Solvent Design for CO2 Capture and Viscosity Tuning." Energy Procedia 114. PNNL-SA-121494. doi:10.1016/j.egypro.2017.03.1215
Davidson C.L., D.J. Heldebrant, M.D. Bearden, J.A. Horner, and C.J. Freeman. 2017. "Enabling CCS via low-temperature geothermal energy integration for fossil-fired power generation." Energy Procedia 114. PNNL-SA-126701. doi:10.1016/j.egypro.2017.03.1781
Heldebrant D.J., P.K. Koech, R.J. Rousseau, V. Glezakou, D. Cantu Cantu, D. Malhotra, and F. Zheng, et al. 2017. "Are Water-Lean Solvent Systems Viable for Post-Combustion CO2 Capture?." Energy Procedia 114. PNNL-SA-121489. doi:10.1016/j.egypro.2017.03.1218
Heldebrant D.J., P.K. Koech, V. Glezakou, R.J. Rousseau, D. Malhotra, and D. Cantu Cantu. 2017. "Water-Lean Solvents for Post-Combustion CO2 Capture: Fundamentals, Uncertainties, Opportunities and Outlook." Chemical Reviews 117, no. 14:9594-9624. PNNL-SA-122499. doi:10.1021/acs.chemrev.6b00768
Malhotra D., J.P. Page, M.E. Bowden, A.J. Karkamkar, D.J. Heldebrant, V. Glezakou, and R.J. Rousseau, et al. 2017. "Phase-Change Aminopyridines as Carbon Dioxide Capture Solvents." Industrial and Engineering Chemistry Research 56, no. 26:7534-7540. PNNL-SA-124645. doi:10.1021/acs.iecr.7b00874
Malhotra D., P.K. Koech, D.J. Heldebrant, D. Cantu Cantu, F. Zheng, V. Glezakou, and R.J. Rousseau. 2017. "Reinventing design principles for developing low-viscosity carbon dioxide-binding organic liquids for flue gas clean up." ChemSusChem 10, no. 3:636-642. PNNL-SA-121959. doi:10.1002/cssc.201601622
Whyatt G.A., A. Zwoster, F. Zheng, R.J. Perry, B.R. Wood, I. Spiry, and C.J. Freeman, et al. 2017. "Measuring CO2 and N2O Mass Transfer into GAP-1 CO2-Capture Solvents at Varied Water Loadings." Industrial Engineering Chemistry Research 56, no. 16:4830-4836. PNNL-SA-123483. doi:10.1021/acs.iecr.7b00193
Yao J., D. Lao, X. Sui, Y. Zhou, S.K. Nune, X. Ma, and T. Troy, et al. 2017. "Two Coexisting Liquid Phases in Switchable Ionic Liquids." Physical Chemistry Chemical Physics 19, no. 34:22627-22623. PNNL-SA-122167. doi:10.1039/C7CP03754F
Yao J., Y. Zhou, X. Sui, D. Lao, D.J. Heldebrant, Z. Zhu, and X. Yu. 2017. "Errata: Switchable 1, 8-diazabicycloundec-7-ene and 1-hexanol ionic liquid analyzed by liquid ToF-SIM." Surface Science Spectra 24, no. 1:018001. PNNL-SA-124584. doi:10.1116/1.4978877

2016

Cantu Cantu D., D. Malhotra, P.K. Koech, D.J. Heldebrant, F. Zheng, C.J. Freeman, and R.J. Rousseau, et al. 2016. "Structure-Property Reduced Order Model for Viscosity Prediction in Single-Component CO2- Binding Organic Liquids." Green Chemistry 18, no. 22:10.1039/C6GC02203K. PNNL-SA-119405. doi:10.1039/c6gc02203k
Cantu Cantu D., J. Lee, M. Lee, D.J. Heldebrant, P.K. Koech, C.J. Freeman, and R.J. Rousseau, et al. 2016. "Dynamic Acid/Base Equilibrium in Single Component Switchable Ionic Liquids and Consequences on Viscosity." The Journal of Physical Chemistry Letters 7, no. 9:1646-1652. PNNL-SA-114453. doi:10.1021/acs.jpclett.6b00395
Heldebrant D.J. 2016. Geothermal Power Generation and CO2 Capture Co-Production, Q1 FY15 Report. PNNL-24084. Richland, WA: Pacific Northwest National Laboratory. Geothermal Power Generation and CO2 Capture Co-Production, Q1 FY15 Report
Heldebrant D.J. 2016. Geothermal Power Generation and CO2 Capture Co-Production. PNNL-24279. Richland, WA: Pacific Northwest National Laboratory. Geothermal Power Generation and CO2 Capture Co-Production
Heldebrant D.J., P.K. Koech, R.J. Rousseau, and V.A. Glezakou. 2016. Accelerating the Development of “Transformational” Solvents for CO2 Separations, Quarterly Progress Report, Budget Period 1, Q3, 2014. PNNL-24285. Richland, WA: Pacific Northwest National Laboratory. Accelerating the Development of “Transformational” Solvents for CO2 Separations, Quarterly Progress Report, Budget Period 1, Q3, 2014
Heldebrant D.J., P.K. Koech, R.J. Rousseau, and V.A. Glezakou. 2016. Accelerating the Development of “Transformational” Solvents for CO2 Separations, Quarterly Progress Report, Budget Period 2, Q5, 2015. PNNL-24860. Richland, WA: Pacific Northwest National Laboratory. Accelerating the Development of “Transformational” Solvents for CO2 Separations, Quarterly Progress Report, Budget Period 2, Q5, 2015
Heldebrant D.J., P.K. Koech, R.J. Rousseau, and V.A. Glezakou. 2016. Accelerating the Development of “Transformational” Solvents for CO2 Separations. PNNL-24032. Richland, WA: Pacific Northwest National Laboratory. Accelerating the Development of “Transformational” Solvents for CO2 Separations
Heldebrant D.J., R.J. Rousseau, and V.A. Glezakou. 2016. Accelerating the Development of “Transformational” Solvents for CO2 Separations Quarterly Progress Report, Budget Period 1, Q4, 2015. PNNL-24530. Richland, WA: Pacific Northwest National Laboratory. Accelerating the Development of “Transformational” Solvents for CO2 Separations Quarterly Progress Report, Budget Period 1, Q4, 2015
Lao D., B.R. Galan, J.C. Linehan, and D.J. Heldebrant. 2016. "The steps of activating a prospective CO2 hydrogenation catalyst with combined CO2 capture and reduction." Green Chemistry 18, no. 18:4871-4874. PNNL-SA-119105. doi:10.1039/C6GC01800A
Lao D., R.K. Kukkadapu, L. Kovarik, B.W. Arey, D.J. Heldebrant, and S.K. Nune. 2016. "Switchable Ionic Liquids: An Environmentally-friendly Medium to Synthesize Nanoparticulate Green Rust." Current Inorganic Chemistry 6, no. 2:92-99. PNNL-SA-110524. doi:10.2174/1877944106999160317160621
Nune S.K., D. Lao, D.J. Heldebrant, J. Liu, M.J. Olszta, R.K. Kukkadapu, and L.M. Gordon, et al. 2016. "Anomalous Water Expulsion from Carbon-Based Rods at High Humidity." Nature Nanotechnology 11, no. 9:791-797. PNNL-SA-112991. doi:10.1038/nnano.2016.91
Whyatt G.A., C.J. Freeman, A. Zwoster, and D.J. Heldebrant. 2016. "Measuring Nitrous Oxide Mass Transfer into Non-Aqueous CO2BOL CO2 Capture Solvents." Industrial and Engineering Chemistry Research 55, no. 16:4720-4725. PNNL-SA-115599. doi:10.1021/acs.iecr.6b00390
Yao J., Y. Zhou, X. Sui, D. Lao, D.J. Heldebrant, Z. Zhu, and X. Yu. 2016. "Switchable 1,8-diazabicycloundec-7-ene and 1-hexanol ionic liquid analyzed by liquid ToF-SIMS." Surface Science Spectra 23, no. 1:9-28. PNNL-SA-114576. doi:10.1116/1.4948526
Zheng F., D.J. Heldebrant, P.M. Mathias, P.K. Koech, M. Bhakta, C.J. Freeman, and M.D. Bearden, et al. 2016. "Bench-Scale Testing and Process Performance Projections of CO2 Capture by CO2-Binding Organic Liquids (CO2BOLs) With and Without Polarity-Swing-Assisted Regeneration." Energy and Fuels 30, no. 2:1192-1203. PNNL-SA-113072. doi:10.1021/acs.energyfuels.5b02437
Zhou Y., J. Yao, Y. Ding, J. Yu, X. Hua, J.E. Evans, and X. Yu, et al. 2016. "Improving the Molecular Ion Signal Intensity for In Situ Liquid SIMS Analysis." Journal of the American Society for Mass Spectrometry 27, no. 12:2006-2013. PNNL-SA-118036. doi:10.1007/s13361-016-1478-x

2015

Jung H., K. Carroll, S. Kabilan, D.J. Heldebrant, D.W. Hoyt, L. Zhong, and T. Varga, et al. 2015. "Stimuli-Responsive/Rheoreversible Hydraulic Fracturing Fluids as a Greener Alternative to Support Geothermal and Fossil Energy Production." Green Chemistry 17, no. 5:2799-2812. PNNL-SA-106027. doi:10.1039/c4gc01917b
Koech P.K., D. Malhotra, D.J. Heldebrant, D. Cantu Cantu, V.A. Glezakou, and R.J. Rousseau. 2015. "Synthesis and characterization of low viscosity carbon dioxide binding organic liquids for flue gas clean up." In Energy & Fuels Preprints Presented at the 249th ACS National Meeting & Exposition, March 22-26, 2015, Denver, Colorado, 60, 628-630. Washington, District Of Columbia:American Chemical Society. PNNL-SA-106437.
Mathias P.M., F. Zheng, D.J. Heldebrant, A. Zwoster, G.A. Whyatt, C.J. Freeman, and M.D. Bearden, et al. 2015. "Measuring the Absorption Rate of CO2 in Nonaqueous CO2-Binding Organic Liquid Solvents with a Wetted-Wall Apparatus." ChemSusChem 8, no. 21:3617-3625. PNNL-SA-107295. doi:10.1002/cssc.201500288
Shao H., S. Kabilan, S.A. Stephens, N. Suresh, A. Beck, T. Varga, and P.F. Martin, et al. 2015. "Environmentally Friendly, Rheoreversible, Hydraulic-fracturing Fluids for Enhanced Geothermal Systems." Geothermics 58. PNNL-SA-105984. doi:10.1016/j.geothermics.2015.07.010

2014

Heldebrant D.J., V.A. Glezakou, P.K. Koech, P.M. Mathias, D. Cantu Cantu, R.J. Rousseau, and D. Malhotra, et al. 2014. "Evaluating transformational solvent systems for post-combustion CO2 separations." Energy Procedia 63. PNNL-SA-115535. doi:10.1016/j.egypro.2015.12.336
Yadav M., J.C. Linehan, A.J. Karkamkar, E.F. Van Der Eide, and D.J. Heldebrant. 2014. "Homogeneous Hydrogenation of CO2 to Methyl Formate Utilizing Switchable Ionic Liquids." Inorganic Chemistry 53, no. 18:9849-9854. PNNL-SA-99647. doi:10.1021/ic501378w

2013

Koech P.K., J. Zhang, I.V. Kutnyakov, L. Cosimbescu, S. Lee, M.E. Bowden, and T.D. Smurthwaite, et al. 2013. "Low viscosity alkanolguanidine and alkanolamidine liquids for CO2 capture." RSC Advances 3, no. 2:556 - 572. PNWD-SA-10043. doi:10.1039/C2RA22801G
Mathias P.M., K. Afshar, F. Zheng, M.D. Bearden, C.J. Freeman, T. Andrea, and P.K. Koech, et al. 2013. "Improving the Regeneration of CO2-Binding Organic Liquids with a Polarity Change." Energy and Environmental Science 6, no. 7:2233-2242. PNNL-SA-94359. doi:10.1039/C3EE41016A
Mathias P.M., L.V. Jasperson, D. VonNiederhausern, M.D. Bearden, P.K. Koech, C.J. Freeman, and D.J. Heldebrant. 2013. "Assessing Anhydrous Tertiary Alkanolamines for High-Pressure Gas Purifications." Industrial and Engineering Chemistry Research 52, no. 49:17562-17572. PNWD-SA-10164. doi:10.1021/ie4020974
Zhang J., I.V. Kutnyakov, P.K. Koech, A. Zwoster, C.J. Howard, F. Zheng, and C.J. Freeman, et al. 2013. "CO2-Binding-Organic-Liquids-Enhanced CO2 Capture using Polarity-Swing-Assisted Regeneration." Energy Procedia 37. PNNL-SA-91349. doi:10.1016/j.egypro.2013.05.113

2012

Jessop P.G., S. Mercer, and D.J. Heldebrant. 2012. "CO2-Triggered Switchable Solvents, Surfactants, and Other Materials." Energy & Environmental Science 5, no. 6:7240-7253. PNNL-SA-83537. doi:10.1039/C2EE02912J

2011

Heldebrant D.J., P.K. Koech, J.E. Rainbolt, and F. Zheng. 2011. "CO2-Binding Organic Liquids, an Integrated Acid Gas Capture System." Energy Procedia 4. PNNL-SA-74727. doi:10.1016/j.egypro.2011.01.044
Heldebrant D.J., P.K. Koech, J.E. Rainbolt, F. Zheng, T.D. Smurthwaite, C.J. Freeman, and M. Oss, et al. 2011. "Performance of Single-Component CO2-Binding Organic Liquids (CO2BOLs) For Post Combustion CO2 Capture." Chemical Engineering Journal 171, no. 3:794-800. PNNL-SA-73185. doi:10.1016/j.cej.2011.02.012
Koech P.K., D.J. Heldebrant, S. Lee, J.E. Rainbolt, and T.D. Smurthwaite. 2011. "Synthesis, characterization and application of alkanolamidines and alkanolguanidines in CO(2) capture." In 241st National Meeting and Exposition of the American Chemical Society, March 27-31, 2011, Anaheim, California, 241, 48-FUEL. Washington, Dc:American Chemical Society. PNNL-SA-76040.
Koech P.K., J.E. Rainbolt, M.D. Bearden, F. Zheng, and D.J. Heldebrant. 2011. "Chemically Selective Gas Sweetening Without Thermal-Swing Regeneration." Energy & Environmental Science 4, no. 4:1385-1390. PNWD-SA-9236. doi:10.1039/c0ee00839g

2010

Bowden M.E., D.J. Heldebrant, A.J. Karkamkar, T.E. Proffen, G.K. Schenter, and T. Autrey. 2010. "The diammoniate of diborane: Crystal structure and hydrogen release." Chemical Communications 46, no. 45:8564-8566. PNNL-SA-74582. doi:10.1039/C0CC03249B
Heldebrant D.J., P.K. Koech, and C.R. Yonker. 2010. "A reversible zwitterionic SO2-binding organic liquid." Energy & Environmental Science 3, no. 1:111-113. PNNL-SA-65189. doi:10.1039/B916550A
Heldebrant D.J., P.K. Koech, and C.R. Yonker. 2010. "A reversible zwitterionic SO2-binding organic liquid." Energy & Environmental Science 3, no. 1:111-113. PNNL-SA-65940. doi:10.1039/b916550a
Heldebrant D.J., P.K. Koech, C.R. Yonker, J.E. Rainbolt, and F. Zheng. 2010. "Reversible Acid Gas Capture Using CO2-Binding Organic Liquids." In Preprints of Symposia - American Chemical Society Fuel Chemistry Division, 55, 81-82. Washington Dc:American Chemical Society. PNNL-SA-69452.
Heldebrant D.J., P.K. Koech, J.E. Rainbolt, and F. Zheng. 2010. "Acid Gas Capture Using CO2-Binding Organic Liquids." In Proceedings of the 2010 Annual Meeting of the AIChE, November 7-12, 2010, Salt Lake City, Utah, Paper No. 334d. New York:American Institute of Chemical Engineers. PNNL-SA-65561.
Heldebrant D.J., P.K. Koech, T. Ang, C. Liang, J.E. Rainbolt, C.R. Yonker, and P.G. Jessop. 2010. "Reversible zwitterionic liquids, the reaction of alkanol guanidines, alkanol amidines, and diamines with CO2." Green Chemistry 12, no. 4:713-721. PNNL-SA-69761. doi:10.1039/b924790d
King D.L., L. Zhang, G. Xia, A.M. Karim, D.J. Heldebrant, X. Wang, and T.H. Peterson, et al. 2010. "Aqueous Phase Reforming of Glycerol for Hydrogen Production Over Pt-Re Supported on Carbon." Applied Catalysis. B, Environmental 99, no. 1-2:206-213. PNNL-SA-71141. doi:10.1016/j.apcatb.2010.06.021
Koech P.K., D.J. Heldebrant, J.E. Rainbolt, F. Zheng, and T.D. Smurthwaite. 2010. "Synthesis, characterization and performance of single-component CO2-binding organic liquids (CO2BOL) for post combustion CO2 capture." In Preprints of Symposia, American Chemical Society. Division of Fuel Chemistry, August 22-26, 2010, Boston, MA, 55, 553-554. Washington Dc:American Chemical Society. PNNL-SA-71880.
Rainbolt J.E., P.K. Koech, C.R. Yonker, F. Zheng, D. Main, M.L. Weaver, and J.C. Linehan, et al. 2010. "Anhydrous Tertiary Alkanolamines as Hybrid Chemical and Physical CO2 Capture Reagents with Pressure-Swing Regeneration." Energy & Environmental Science 4, no. 2:480-484. PNWD-SA-9112. doi:10.1039/C0EE00506A
Shaw W.J., M.E. Bowden, A.J. Karkamkar, C.J. Howard, D.J. Heldebrant, N.J. Hess, and J.C. Linehan, et al. 2010. "Characterization of a New Phase of Ammonia Borane." Energy & Environmental Science 3, no. 6:796-804. PNNL-SA-66903.

2009

Heldebrant D.J., C.R. Yonker, P.G. Jessop, and L. Phan. 2009. "CO2-binding organic liquids (CO2BOLs) for post-combustion CO2 capture." In Energy Procedia - Proceedings of the 9th International Conference on Greenhouse Gas Control Technologies (GHGT-9), 1, 1187-1195. Oxford:Elsevier. PNNL-SA-62806. doi:10.1016/j.egypro.2009.01.156
Heldebrant D.J., C.R. Yonker, P.G. Jessop, and L. Phan. 2009. "Reversible uptake of COS, CS2 and SO2; Ionic liquids with O-alkylxanthate, O-alkylthiocarbonate, and O-alkylsulfite anions." Chemistry - A European Journal 15, no. 31:7619-7627. PNNL-SA-62088.
Hess N.J., G.K. Schenter, M.R. Hartman, L.L. Daemen, T.E. Proffen, S.M. Kathmann, and C.J. Mundy, et al. 2009. "Neutron Powder Diffraction and Molecular Simulation Study of the Structural Evolution of Ammonia Borane from 15 to 340 K." Journal of Physical Chemistry A 113, no. 9:5723-5735. PNNL-SA-63995. doi:10.1021/jp900839c
Karkamkar A.J., S.M. Kathmann, G.K. Schenter, D.J. Heldebrant, N.J. Hess, M.S. Gutowski, and T. Autrey. 2009. "Thermodynamic and Structural Investigations of Ammonium Borohydride, a Solid with a Highest Content of Thermodynamically and Kinetically Accessible Hydrogen." Chemistry of Materials 21, no. 19:4356-4358. PNNL-SA-62087. doi:10.1021/cm902385c
Pons V., V. Pons, R. Baker, N.K. Szymczak, D.J. Heldebrant, J.C. Linehan, and M.H. Matus, et al. 2009. "Coordination of aminoborane, NH2BH2, dictates selectivity and extent of H2 release in metal-catalysed ammonia borane dehydrogenation." Chemical Communications 48. PNNL-SA-64217. doi:10.1039/b809190k

2008

Heldebrant D.J., A.J. Karkamkar, J.C. Linehan, and T. Autrey. 2008. "Synthesis of Ammonia Borane for Hydrogen Storage Applications." Energy & Environmental Science 1, no. 1:156-160. PNNL-SA-60960. doi:10.1039/b808865a
Heldebrant D.J., A.J. Karkamkar, J.C. Linehan, and T. Autrey. 2008. "Synthesis of Ammonia Borane for Hydrogen Storage Applications." Energy & Environmental Science 1, no. 1:156-160. PNNL-SA-61234.
Heldebrant D.J., A.J. Karkamkar, N.J. Hess, M.E. Bowden, S.D. Rassat, F. Zheng, and K.G. Rappe, et al. 2008. "The Effects of Chemical Additives on the Induction Phase in Solid-State Thermal Decomposition of Ammonia Borane." Chemistry of Materials 20, no. 16:5332-5336. PNNL-SA-60433. doi:10.1021/cm801253u
Heldebrant D.J., C.R. Yonker, P.G. Jessop, and L. Phan. 2008. "Organic Liquid CO2 Capture Agents With High Gravimetric CO2 Capacity." Energy & Environmental Science 1, no. 4:487-493. PNNL-SA-60661.
Hess N.J., M.R. Hartman, C. Brown, E. Mamontov, A.J. Karkamkar, D.J. Heldebrant, and L.L. Daemen, et al. 2008. "Quasielastic neutron scattering of -NH3 and -BH3 rotational dynamics in orthorhombic ammonia borane." Chemical Physics Letters 459, no. 1-6:85-88. PNNL-SA-58774. doi:10.1016/j.cplett.2008.04.130
Shaw W.J., J.C. Linehan, N.K. Szymczak, D.J. Heldebrant, C.R. Yonker, D.M. Camaioni, and R. Baker, et al. 2008. "In Situ Multinuclear NMR Spectroscopic Studies of the Thermal Decomposition of Ammonia Borane in Solution." Angewandte Chemie International Edition 47, no. 39:7493-7496. PNNL-SA-60317. doi:10.1002/anie.200802100
Zheng F., S.D. Rassat, D.J. Heldebrant, D.D. Caldwell, C.L. Aardahl, T. Autrey, and J.C. Linehan, et al. 2008. "Automated gas burette system for evolved hydrogen measurements." Review of Scientific Instruments 79, no. 8:Article no: 084103. PNNL-SA-60596. doi:10.1063/1.2968715

2007

Heldebrant D.J., J.C. Linehan, D.M. Camaioni, S.D. Rassat, F. Zheng, and T. Autrey. 2007. "EFFECT OF ADDITIVES ON THE THERMOLYSIS OF AMMONIA BORANE." In 234th American Chemical Society Conference Proceedings - Reprints of Symposia - Division of Fuel Chemistry., 52, 563-564. Washington Dc:American Chemical Society. PNNL-SA-55182.