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Energy and Environment Directorate

Kriston Brooks

Kriston Brooks

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352
(509) 372-4343


Kriston Brooks is the lead for the Process Engineering Team and a chief engineer with more than 25 years of experience in experimental design, computer modeling, and project management. He has a Master's degree in chemical engineering from Brigham Young University in the area of solid rocket propellant combustion. Mr. Brooks has performed simulations and radioactive experimental work in the field of radioactive tank waste separations in the areas of ion exchange, cross flow filtration, membranes, and settle/decant. He has done modeling and experimental work in the areas of heat transfer and reaction engineering for such applications as microchannel reactors for fuel processing and hydrogen storage for fuel cell vehicles. He has been a technical lead and project management in the area of plutonium disposition. The technical work included development of process drawings, throughput modeling, technical maturity assessments, and option studies. He has managed life cycle cost estimates, criticality analyses, and demonstrations.

Research Interests

  • Hydrogen storage materials testing and evaluation
  • Chemical reactor design, testing, and modeling
  • Discrete event throughput modeling
  • Chemical process modeling
  • Project management

Education and Credentials

  • M.S., Chemical Engineering, Brigham Young University, 1992
  • B.S., Chemical Engineering, Brigham Young University, 1990

Affiliations and Professional Service

  • American Institute of Chemical Engineers: Chair for Unconventional Technologies for CO2 Capture, Conversion and Utilization (2013-present)

Awards and Recognitions

  • DOE "Q" Clearance
  • 1999 R&D100 Award for Development of a Combustion-Fired MicroHeater
  • 2012 "Highly Stable and Active Catalyst for Sabatier Reactions" submitted for a Tech Brief Monetary Award by Johnson Space Center.
  • TeGrotenhuis, W. E., D. L. King, G. A. Whyatt, C. M. Fischer, R. S. Wegeng, and K. P. Brooks, "Microchannel Reactors With Temperature Control," U.S. Patent No. 7,297,324 issued on November 20, 2007.
  • Kriston P Brooks, David L King, Victoria S Stenkamp, Ward E Tegrotenhuis, Robert S Wegeng, and Greg A Whyatt, "Devices with Extended Area Structures for Mass Transfer Processing of Fluids." U.S. Patent No. 7,520,917 issued on April 21, 2009.
  • Kriston P Brooks, Jamie D Holladay, Kevin L Simmons, and Darrell R Herling, "Combined on-board hydride slurry storage and reactor system and process for hydrogen-powered vehicles and devices," U.S. Patent No. 8,889,097 issued on November 18, 2014.

PNNL Patents

PNNL Publications


  • Klymyshyn N.A., K.P. Brooks, and N.P. Barrett. 2024. "Methods for Estimating Hydrogen Fuel Tank Characteristics." Journal of Pressure Vessel Technology 146, no. 1:Art. No. 011501. PNNL-SA-183750. doi:10.1115/1.4063884


  • Mevawala C.R., K.P. Brooks, M.E. Bowden, H. Breunig, B.L. Tran, O.Y. Gutierrez-Tinoco, and S. Autrey, et al. 2023. "The ethanol - ethyl acetate system as a biogenic hydrogen carrier." Energy Technology 11, no. 1:Art. No. 2200892. PNNL-SA-169753. doi:10.1002/ente.202200892


  • Allendorf M.D., V. Stavila, J.L. Snider, M. Witman, M.E. Bowden, K.P. Brooks, and B.L. Tran, et al. 2022. "Challenges to developing materials for the transport and storage of hydrogen." Nature Chemistry 14, no. 11:1214-1223. PNNL-SA-156815. doi:10.1038/s41557-022-01056-2
  • Clelland D.T., D.R. Merkel, E.K. Nickerson, K.P. Brooks, V.V. Joshi, C.A. Lavender, and Z.F. Huber. 2022. "Forming Complex Nuclear Fuel Shapes in High-Loaded Silicide Surrogates." In Proceedings of the 42nd International Meeting on Reduced Enrichment for Research and Test Reactors (RERTR 2022), October 3-5, 2022, Vienna, Austria. Lemont, Illinois:Argonne National Laboratory. PNNL-SA-178118.
  • Huber Z.F., E.R. Conte, M.A. Rossiter, A. Soulami, K.P. Brooks, C.L. Painter, and V.V. Joshi, et al. 2022. "A Robust Processing Approach for Producing Highly Loaded Dispersion Fuels." In Proceedings of the 42nd International Meeting on Reduced Enrichment for Research and Test Reactors (RERTR 2022), October 3-5, 2022, Vienna, Austria, Paper No. S5-P2. Lemont, Illinois:Argonne National Laboratory. PNNL-SA-178158.
  • Mason C., K. Choi, A. Soulami, K.I. Johnson, K.P. Brooks, N.K. Karri, and V.V. Joshi. 2022. "Computational Modeling of Multi-Pass Rolling Parameters Effect on Resulting Fuel Foil Shape." In Proceedings of the ASME 2022 International Mechanical Engineering Congress and Exposition (IMECE 2022), October 30-November 3, 2022, Columbus, OH, IMECE2022-95081, V006T08A047. New York, New York:ASME. PNNL-SA-172583. doi:10.1115/IMECE2022-95081
  • Royer J.I., S. Shahrezaei, A. Soulami, K.P. Brooks, M.T. Athon, Z.F. Huber, and M.A. Rhodes, et al. 2022. Hot Forging Options for Thick Castings. PNNL-34151. Richland, WA: Pacific Northwest National Laboratory. Hot Forging Options for Thick Castings
  • Shimskey R.W., K.A. Adams, Z.F. Huber, S.H. Swenson, and K.P. Brooks. 2022. Electropolishing of a Full-Sized U-10Mo Plate. PNNL-34106. Richland, WA: Pacific Northwest National Laboratory. Electropolishing of a Full-Sized U-10Mo Plate


  • Tran B.L., S. Johnson, K.P. Brooks, and S. Autrey. 2021. "Ethanol as a Liquid Organic Hydrogen Carrier for Seasonal Microgrid Application: Catalysis, Theory, and Engineering Feasibility." ACS Sustainable Chemistry & Engineering 9, no. 20:7130-7138. PNNL-SA-160818. doi:10.1021/acssuschemeng.1c01513


  • Brooks K.P., S. Sprik, D. Tamburello, and M. Thornton. 2020. "Design Tool for Estimating Metal Hydride Storage System Characteristics for Light-Duty Hydrogen Fuel Cell Vehicles." International Journal of Hydrogen Energy 45, no. 46:24917-24927. PNNL-SA-150701. doi:10.1016/j.ijhydene.2020.05.159
  • Grubel K., J. Su, J. Kothandaraman, K.P. Brooks, G. Somorjai, and S. Autrey. 2020. "Research Requirements to Move the Bar forward Using Aqueous Formate Salts as H2 Carriers for Energy Storage Applications." Journal of Energy and Power Technology 2, no. 4:21. PNNL-SA-154330. doi:10.21926/jept.2004016


  • Barclay J.A., K.P. Brooks, J. Cui, J.D. Holladay, K.D. Meinhardt, E. Polikarpov, and E.C. Thomsen. 2019. "Propane Liquefaction with an Active Magnetic Regenerative Liquefier." Cryogenics 100. PNNL-SA-137298. doi:10.1016/j.cryogenics.2019.01.009


  • Brooks K.P., S. Sprik, D. Tamburello, and M. Thornton. 2018. "Design Tool for Estimating Chemical Hydrogen Storage System Characteristics for Light-Duty Fuel Cell Vehicles." International Journal of Hydrogen Energy 43, no. 18:8846-8858. PNNL-SA-131671. doi:10.1016/j.ijhydene.2018.03.090


  • Muller K.W., K.P. Brooks, and S. Autrey. 2017. "Hydrogen storage in formic acid: A comparison of process options." Energy and Fuels 31, no. 11:12603-12611. PNNL-SA-129670. doi:10.1021/acs.energyfuels.7b02997


  • Brooks K.P., M.E. Bowden, A.J. Karkamkar, A.Y. Houghton, and T. Autrey. 2016. "Coupling of Exothermic and Endothermic Hydrogen Storage Materials." Journal of Power Sources 324. PNNL-SA-113561. doi:10.1016/j.jpowsour.2016.05.067


  • 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
  • Semelsberger T., and K.P. Brooks. 2015. "Chemical hydrogen storage material property guidelines for automotive applications." Journal of Power Sources 279. PNNL-SA-110719. doi:10.1016/j.jpowsour.2015.01.040


  • Brooks K.P. 2014. "Fuel Cell Based Auxiliary Power Unit for Refrigerated Trucks." In 2014 Progress Report for the DOE Hydrogen and Fuel Cells Program. 26-29. Washington Dc:U.S. Department of Energy. PNNL-23496.
  • Brooks K.P., and A. Makhmalbaf. 2014. "Fuel Cell Combined Heat and Power Commercial Demonstration." In 2014 Progress Report for the DOE Hydrogen and Fuel Cells Program. 7-11. Washington Dc:U.S. Department of Energy. PNNL-23497.
  • Brooks K.P., K.L. Simmons, and M.R. Weimar. 2014. "Systems Engineering of Chemical Hydrogen Storage, Pressure Vessel and Balance of Plant for Onboard Hydrogen Storage." In 2014 Progress Report for the DOE Hydrogen and Fuel Cells Program. 30-35. Washington Dc:U.S. Department of Energy. PNNL-23498.
  • Brooks K.P., R.P. Pires, and K.L. Simmons. 2014. "Development and Validation of a Slurry Model for Chemical Hydrogen Storage in Fuel Cell Applications." Journal of Power Sources 271. PNNL-SA-103265. doi:10.1016/j.jpowsour.2014.07.186
  • Brooks K.P., T. Semelsberger, K.L. Simmons, and B.A. Van Hassel. 2014. "Slurry-Based Chemical Hydrogen Storage Systems for Automotive Fuel Cell Applications." Journal of Power Sources 268. PNNL-SA-102109. doi:10.1016/j.jpowsour.2014.05.145
  • Choi Y., E. Ronnebro, S.D. Rassat, A.J. Karkamkar, G.D. Maupin, J.D. Holladay, and K.L. Simmons, et al. 2014. "Kinetics Study of Solid Ammonia Borane Hydrogen Release - Modeling and Experimental Validation for Chemical Hydrogen Storage." Physical Chemistry Chemical Physics. PCCP 16, no. 17:7959-7968. PNNL-SA-93992. doi:10.1039/C3CP55280B
  • Makhmalbaf A., K.P. Brooks, V. Srivastava, S. Pilli, and N. Foster. 2014. "Lesson Learned from Technical and Economic Performance Assessment and Benefit Evaluation of CHP-FCS." In 2014 ACEEE Summer Study on Energy Efficiency in Buildings. The Next Generation: Reaching for High Energy Savings, August 17-22, 2014, Pacific Grove, California, 3-207 - 3-218. Washington Dc:American Council for an Energy-Efficient Economy. PNNL-SA-101459.


  • Devarakonda M.N., K.P. Brooks, E. Ronnebro, and S.D. Rassat. 2012. "Systems Modeling, Simulation and Material Operating Requirements for Chemical Hydride Based Hydrogen Storage." International Journal of Hydrogen Energy 37, no. 3:2779-2793. PNNL-SA-76656. doi:10.1016/j.ijhydene.2011.06.121
  • Devarakonda M.N., K.P. Brooks, E. Ronnebro, S.D. Rassat, and J.D. Holladay. 2012. "Chemical Hydrides for Hydrogen Storage in Fuel Cell Applications." In SAE World Congress and Exhibition, April 24-26, 2012, Detroit, Michigan, SAE Technical Paper 2012-01-1229. Warrendale, Pennsylvania:SAE International. PNNL-SA-83367. doi:10.4271/2012-01-1229


  • Brooks K.P., M.N. Devarakonda, S.D. Rassat, and J.D. Holladay. 2011. "Systems Modeling of Chemical Hydride Hydrogen Storage Materials for Fuel Cell Applications." Journal of Fuel Cell Science and Technology 8, no. 6:Article No. 061021. PNNL-SA-78538. doi:10.1115/1.4004477


  • Brooks K.P., M.N. Devarakonda, S.D. Rassat, D.A. King, and D.R. Herling. 2010. "SYSTEMS MODELING OF AMMONIA BORANE BEAD REACTOR FOR OFF-BOARD REGENERABLE HYDROGEN STORAGE IN PEM FUEL CELL APPLICATIONS." In Proceedings of the ASME 2010 Eighth International Fuel Cell Science, Engineering and Technology Conference (FuelCell2010), 1, 729-734. New York, New York:American Society of Mechanical Engineers. PNNL-SA-71490.
  • Devarakonda M.N., J.D. Holladay, K.P. Brooks, S.D. Rassat, and D.R. Herling. 2010. "Dynamic Modeling and Simulation Based Analysis of an Ammonia Borane (AB) Reactor System for Hydrogen Storage." ECS Transactions 33, no. 1:1959 - 1972. PNNL-SA-73748. doi:10.1149/1.3484687


  • Holladay J.D., K.P. Brooks, P.H. Humble, J. Hu, and T. Simon. 2008. "Compact Reverse Water-Gas-Shift Reactor for Extra-Terrestrial In-Situ Resource Utilization (ISRU)." Journal of Propulsion and power 24, no. 3:578-582. PNWD-SA-8043.


  • Brooks K.P., J. Hu, H. Zhu, and R. Kee. 2007. "Methanation of carbon dioxide by hydrogen reduction using the Sabatier process in microchannel reactors." Chemical Engineering Science 62, no. 4:1161-1170. PNWD-SA-7455. doi:10.1016/j.ces.2006.11.020
  • Hu J., K.P. Brooks, J.D. Holladay, D. Howe, and T.M. Simon. 2007. "Catalyst Development for Microchannel Reactors for Martian In Situ Propellant Production." Catalysis Today 125, no. 1-2:103-110. PNWD-SA-7581.
  • Palo D.R., V.S. Stenkamp, J.D. Holladay, P.H. Humble, R.A. Dagle, and K.P. Brooks. 2007. "Non-Reactor Micro-Component Development." In Micro-Instrumentation for High Throughput Experimentation and Process Intensification, edited by MV Koch, KM VandenBussche, R Chrisman. 131-180. Weinheim:Wiley-VHC. PNNL-SA-47051.


  • Brooks K.P., and W.E. TeGrotenhuis. 2006. "Radiator Performance Enhancement using a LiBr-H2O Absorption Cooler and Microchannel Technology: A Portable Life Support System Example." In 36th International Conference on Environmental Systems (ICES), July 17-20, 2006, Norfolk, VA, Paper No. 2006-01-2267. Warrendale, Pennsylvania:SAE International. PNNL-SA-49024. doi:10.4271/2006-01-2267
  • Brooks K.P., B.S. Augspurger, D.L. Blanchard, J.M. Cuta, S.K. Fiskum, and M.R. Thorson. 2006. "Hydraulic Testing of Ion Exchange Resins for Cesium Removal from Hanford Tank Waste." Separation Science and Technology 41, no. 11:2391-2408. PNWD-SA-7241.
  • Brooks K.P., S.D. Rassat, J. Hu, V.S. Stenkamp, S.N. Schlahta, J.R. Bontha, and J.D. Holladay, et al. 2006. "Development of a Microchannel In Situ Propellant Production System." In Space Technology and Applications International Forum--STAIF 2006, edited by MS El-Genk, 813, 111-1121. Melville, New York:American Institute of Physics. PNWD-SA-7376.


  • Brooks K.P., J.M. Davis, C.M. Fischer, D.L. King, L.R. Pederson, G.C. Rawlings, and V.S. Stenkamp, et al. 2005. "Fuel Reformation: Microchannel Reactor Design." In Microreactor Technology and Process Intensification : ACS Symposium Series, edited by Yong Wang and Jamelyn D. Holladay. 238-257. New York, New York:Oxford University Press. PNNL-SA-42332.
  • King D.L., K.P. Brooks, C.M. Fischer, L.R. Pederson, G.C. Rawlings, V.S. Stenkamp, and W.E. TeGrotenhuis, et al. 2005. "Fuel Reformation: Catalyst Requirements in Microchannel Architectures." In Microreactor Technology and Process Intensification, ACS Symposium Series, edited by Yong Wang and Jamelyn D. Holladay. 119-128. Washington, District Of Columbia:American Chemical Society. PNNL-SA-44437.


  • Hollenberg G.W., D.E. Kurath, and K.P. Brooks. 1999. "Ceramic Membranes for Separation of Sodium." Journal of the American Ceramic Society 92. PNNL-SA-29954.


Energy and Environment

Core Research Areas