(210a) Catalytic Upgrading of Pyrolysis Vapor at Bench Scale with Platinum on Titania
To this end, a bench-scale bubbling fluidized bed pyrolyzer was operated at 150 g/h feed rate of pine flour with a 100 g fixed-bed catalytic upgrader. A 0.5% Pt/TiO2 catalyst produced a lower oxygen (< 20%) liquid at 40% carbon efficiency at 400°C and biomass-to-catalyst ratio (B:C) of 3 for numerous cycles. The catalyst was regenerated and reused by oxidation with air and reduction with hydrogen. The oxidation and reduction times were reduced to 2 h and 1 h respectively without compromising performance or catalyst temperature control. Increasing the pyrolysis temperature from 500°C to 550°C allowed operation at B:C greater than 3 at comparable performance. Performance was generally similar to 2% Pt/TiO2 but at reduced catalyst cost. Projected costs are < $4/gallon of gasoline blendstock. Responses to other parameter changes and prospects for further improvements will be discussed.