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Energy and Environment Directorate

Charles Freeman

Charles Freeman

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352
(509) 375-6368


Charles Freeman is the Technical Group Manager for PNNL’s Hydrocarbon Processing group, a 45-person organization that represents the lab’s capabilities in applied catalysis, gas separations, and advanced process development.

Mr. Freeman also has a role in leading PNNL’s carbon capture technology program portfolio. In this capacity he works with engineers and scientists to identify new and promising capture technologies and technical capabilities that are relevant to the Department of Energy and industry.

Prior to joining PNNL in 2009 Mr. Freeman was the Process Technology Manager for Johns Manville, a global building products company. There he had technical responsibility for process development for more than 30 manufacturing facilities worldwide and more than $50M per year of capital equipment investments for higher efficiency and productivity.

Education and Credentials

  • 1989 Washington State University, B.S. in Chemical Engineer
  • 1991 Washington State University, M.S. in Chemical Engineer

PNNL Patents

PNNL Publications


  • 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


  • Liu J., J. Dempsey, S. Li, Y. Jiang, L.J. Snowden-Swan, W.L. Kubic, and E. Tan, et al. 2022. "Methodology for Assessing the Maximum Potential Impact of Separations Opportunities in Industrial Processes." Frontiers in Sustainability 3. PNNL-SA-178090. doi:10.3389/frsus.2022.1056580


  • 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



  • Cullinan V.I., L.A. Mahoney, T.M. Brouns, S.K. Nune, J.A. Bamberger, C.K. Clayton, and L.F. Pease, et al. 2019. BY-110 Headspace Sampling Comparison Test. PNNL-28801 Vol. 1. Richland, WA: Pacific Northwest National Laboratory. BY-110 Headspace Sampling Comparison Test


  • 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
  • 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


  • 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
  • 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
  • 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


  • Fernandez C.A., S.K. Nune, H.V. Annapureddy, L.X. Dang, B.P. McGrail, F. Zheng, and E. Polikarpov, et al. 2015. "Hydrophobic and moisture-stable metal-organic frameworks." Dalton Transactions 44, no. 30:13490 - 13497. PNNL-SA-106696. doi:10.1039/C5DT00606F
  • 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


  • 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


  • 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


  • McGrail B.P., C.J. Freeman, C.F. Brown, E.C. Sullivan, S.K. White, S. Reddy, and R. Garber, et al. 2012. "Overcoming Business Model Uncertainty in a Carbon Dioxide Capture and Sequestration Project: Case Study at the Boise White Paper Mill." International Journal of Greenhouse Gas Control 9. PNWD-SA-9733. doi:10.1016/j.ijggc.2012.03.009


  • Cabe J.E., D.A. King, and C.J. Freeman. 2011. "Post Combustion Test Bed Development." Carbon Capture Journal Nov/Dec, no. 24:Online. PNNL-SA-83361.
  • 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


  • Goles R.W., R.A. Merrill, C.J. Freeman, G.B. Josephson, G.A. Whyatt, D.K. Seiler, and D.A. Lamar. 1998. Engineering-Scale DC Arc Furnance Testing Summary. PNNL-11972. Richland, WA: Pacific Northwest National Laboratory. Engineering-Scale DC Arc Furnance Testing Summary

Energy and Environment

Core Research Areas