349017 Deactivation of Pyrolysis Vapor Phase Upgrading Catalysts

Monday, November 4, 2013
Grand Ballroom B (Hilton)
Madelyn Ball1, Alexander Stanton2,3 and Kristiina Iisa2, (1)University of New Hampshire, Durham, NH, (2)National Renewable Energy Laboratory, Golden, CO, (3)Colorado State University, Fort Collins, CO

The objective of this study was to identify conditions under which catalyst deactivation was delayed during the upgrading of pine pyrolysis vapors. The formation of coke on the catalyst significantly and quickly deactivates the catalyst during the upgrading process and by extending the catalyst life, the overall process feasibility can be improved. Three catalysts, a ZSM-5 type zeolite and ZSM-5 type zeolites with additions of Ni and Pt, were investigated under two pressures, 40 and 200 psi, and with two carrier gases, helium and hydrogen. Experiments were conducted by pyrolyzing pine biomass samples, passing the product vapors over the catalyst bed, and analyzing the products using GC/MS. At low pressure, deactivation was delayed under hydrogen for the metal substituted catalysts compared to the unsubstituted catalyst. At high pressure, the active life of the catalysts was much longer than at low pressure for both carrier gases. Although hydrogen did not appear to delay deactivation at low pressure compared to helium for the unsubstituted catalyst, at high pressure hydrogen did delay deactivation. The greatest delay in deactivation was observed for the Pt substituted catalyst at high pressure.

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