Raymond L. Huhnke, Ph.D., P.E.

Director – Biobased Products and Energy Center
Professor – Biosystems and Agricultural Engineering
Office: 223 Agricultural Hall
Phone: 405.744.8417
Email: raymond.huhnke@okstate.edu 
 Links: Huhnke’s Biographical Sketch
Sun Grant Program-South Central Region
Oklahoma NSF EPSCoR


B.S. Agricultural Engineering, Purdue University, 1973
M.S. Agricultural Engineering, University of Illinois, 1974
Ph.D. Agricultural Engineering, Iowa State University, 1980


Huhnke has been a team leader on several multidisciplinary, multi-institutional projects in converting low-cost biomass into liquid fuel and other value-added products using a gasification-fermentation process. Currently, he supports research in feedstock logistics and thermochemical conversion of biomass. From 2008-2013, Huhnke was the research coordinator on a five-year NSF EPSCoR Research Infrastructure Improvement Plan entitled “Building Oklahoma’s Leadership Role in Cellulosic Bioenergy”.   According to Huhnke, “Some members of our society believe that biofuels compete with our petroleum resources. We must provide education to everyone – secondary education students through general public – about the benefits of biofuels and how we can use our biobased resources to develop alternative forms of energy to supplement our fossil fuels while reducing our dependence on foreign oil”.


Bhoi, P.R., R.L. Huhnke, A. Kumar, S. Thapa and N. Indrawan. 2018. Scale-up of a downdraft gasifier system for commercial scale mobile power generation. Renewable Energy 118:25-33; doi.org/10.1016/j.renene.2017.11.002.

Phillips, J.R., R.L. Huhnke and H.K. Atiyeh. 2017. Syngas Fermentation: A microbial conversion process of gaseous substrates to various products. Fermentation 3(2):28; doi:10.3390/fermentation3020028. IN: Special Issue “Biofuels and Biochemicals Production.”

Craige, C., M.D. Buser, R.S. Frazier, S.S. Hiziroglu, R.B. Holcomb and R.L. Huhnke. 2016. Conceptual design of a biofeedstock supply chain model for eastern redcedar. Computers and Electronics in Agriculture 121:12-24.

Kumar, A., Z. Yang, R.L. Huhnke, M. Buser and S. Capareda. 2016. Pyrolysis of eastern redcedar in PY-GC-MS and batch reactors. Journal of Analytical and Applied Pyrolysis 166:157-165.

Ramachandriya, K.D, D.K. Kundiyana, A.M. Sharma, A. Kumar, H.K. Atiyeh, R.L. Huhnke, and M.R. Wilkins. 2016. Critical factors affecting the integration of biomass gasification and syngas fermentation technology. AIMS Bioengineering 3:188-210.

Bhoi, P.R., R.L. Huhnke, A. Kumar, M.E. Payton, K.N. Patil and J.R. Whiteley. 2015. Vegetable oil as a solvent for removing producer gas tar compounds. Fuel Processing Technology 133:97–104.

Kumar, A., and R. Huhnke. 2014. Biomass thermochemical conversion technologies for production of fuels, power and chemicals. In: H. Luo, Y. Wu and C. Kole (eds.). Compendium of Bioenergy Plants – Switchgrass. CRC Press, Taylor & Francis Group, Boca Raton, FL.

Patil, K.N., R.L. Huhnke and D.D. Bellmer. 2014. Downdraft Gasifier with Internal Cyclonic Combustion Chamber, U.S. Patent 8,657,892 issued 02/25/2014.

Rownaghi, A.A. and R.L. Huhnke. 2013. Producing hydrogen-rich gases by steam reforming of syngas tar over CaO/MgO/NiO catalysts. ACS Sustainable Chem. Eng. 1:80-86.

Sharma, A. M., A. Kumar, K. N. Patil and R.L. Huhnke. 2013. Fluidization characteristics of a mixture of gasifier solid residues, switchgrass and inert material. Powder Technology. 235: 661-668.

Pasangulapati, V., K.D. Ramachandriya, A. Kumar, M.R. Wilkins, C.L. Jones and R.L. Huhnke. 2012. Effects of cellulose, hemicellulose and lignin on thermochemical conversion characteristics of the selected biomass. Bioresource Technology 114:663-669.

Kundiyana, D.K., R.L. Huhnke and M.R. Wilkins. 2011. Effect of nutrient limitation and two-stage continuous fermentor design on productivities during “Clostridium ragsdalei” syngas fermentation. Bioresource Technology 102:6058-6064.

Patil, K.N., P.R. Bhoi, R.L. Huhnke and D.D. Bellmer. 2011. Biomass downdraft biomass gasifier with internal cyclonic combustion chamber: Design, construction, and experimental results.  Bioresource Technology 102:6286-6290.

Huhnke, R.L., R.S. Lewis and R.S. Tanner. 2010. Isolation and characterization of novel Clostridial species, U.S. Patent 7,704,723 issued April 27, 2010.

Kundiyana, D.K., R.L. Huhnke, P. Maddipati, H.K. Atiyeh and M.R. Wilkins. 2010. Feasibility of incorporating cotton seed extract in Clostridium strain P11 fermentation medium during synthesis gas fermentation. Bioresource Technology 101(24): 9673–9680.

Kundiyana, D., R. Huhnke and M. Wilkins. 2010. Syngas fermentation in a 100 L pilot scale fermentor: design and process considerations. Journal of Bioscience and Bioengineering 109:492-498.

Ahmed, A., B.G. Cateni, R.L. Huhnke and R.S. Lewis. 2006. Effects of biomass-generated producer gas constituents on cell growth, product distribution and hydrogenase activity of Clostridium carboxidivorans P7. Biomass and Bioenergy 30(7):665-672.