Aqueous Phase Reformation: New Pathway for Renewable Biomass to Offset Fossil Fuels

I’ve been leading a new area of research aimed at offsetting natural gas consumption with hydrogen produced from biomass-derived sugars or waste glycerol from biodiesel production. The process utilizes waste heat in the exhaust from internal-combustion-engine power plants to drive chemical reactions that produce hydrogen. The hydrogen can then be blended with the primary natural gas fuel in order to enhance combustion. Hydrogen-enriched combustion can increase efficiency by up to 20% and reduce emissions of NOx by more than 95%.

The current project is focused on understanding the use of catalysts in aqueous phase reformation (APR) processes to speed up chemical reactions so that medium-temperature waste heat can be used to reform a wide range of plant based feedstocks.

Mark Severy recently graduated with a M.S. in Environmental Resources Engineering from HSU.  His thesis modeled the waste heat resources available from large internal-combustion-engine power plants like the one at the Humboldt Bay Generating Station. His work demonstrates that, depending on engine type and operating conditions, there is sufficient waste heat to replace a significant portion of the natural gas with hydrogen produced from waste glycerol left over from biodiesel production.  His work also shows that water vaporization in APR can consume a significant portion of the recovered waste heat.  By raising the APR pressure, this water vaporization could be reduced. We are currently applying for grants to experimentally investigate high-pressure APR.

Waste heat from engine exhaust is used to convert the feedstock into hydrogen rich gas. The hydrogen produced in the reformer will be mixed with natural gas and air in the combustion engine to increase efficiency and reduce emissions.

Waste heat from engine exhaust is used to convert the feedstock into hydrogen rich gas. The hydrogen produced in the reformer will be mixed with natural gas and air in the combustion engine to increase efficiency and reduce emissions.