Researchers Examine How Potassium in Biomass Feedstocks Poisons a Catalyst

 By Lynn L. Bergeson and Carla N. Hutton
 
The U.S. Department of Energy’s (DOE) Bioenergy Technologies Office (BETO) announced on August 11, 2022, that a research team from Pacific Northwest National Laboratory investigated how potassium in biomass feedstocks poisons a catalyst. The researchers focused their study on potassium, a common alkali metal found in biomass feedstocks, since previous analysis of deactivated catalysts after catalytic fast pyrolysis (CFP) of woody biomass feedstock revealed potassium accumulation on the catalysts’ surface.
 
The research team simulated catalyst poisoning at different potassium levels to trigger deactivation during industrial operations. They then analyzed the catalysts and conducted kinetic measurements to determine how the catalysts’ ability to catalyze chemical reaction changed with the introduction of potassium. According to BETO, the team found potassium poisoning could be substantially mitigated with a developed regeneration method — a water washing process — that can successfully remove most of the loaded potassium, restoring more than 90 percent of the catalytic activities.
 
BETO states that the results of these studies provide new insights for the bioenergy industry that will foster improved catalyst design and regeneration for longer lasting catalysts. The studies also created “a solid knowledge base for developers of biomass conversion technologies to continue to build upon, making new and innovative conversion technologies less risky to research and develop.” According to BETO, the work “also supports accelerated process development that can help industry convert biomass feedstocks commercially, leading to more effective and inexpensive production of biofuels.”