291676 In Situ Temperature Programmed Spectroscopy During Pyrolysis of Model Biomass Compounds

Monday, October 29, 2012
Hall B (Convention Center )
Aaron Fink, Christopher Keturakis and Israel E. Wachs, Chemical Engineering, Lehigh University, Bethlehem, PA

Biofuel production via pyrolysis of biomass is an attractive option to help end the dependence on fossil fuels. The biomass literature has yet to examine the dynamic changes of the catalyst under pyrolysis reaction conditions. The objective of this investigation is to unravel molecular level details about the catalytic active sites and reaction mechanism during biomass pyrolysis by employing in situ Raman and IR spectroscopy techniques. The dehydrated structures of ZSM-5 catalysts (with varying Si/Al ratios) were analyzed by in situ Raman and IR spectroscopy. In situ temperature programmed IR (TP-IR) spectroscopy was utilized to monitor surface reactive species that formed during either furan or xylose pyrolysis (physical mixture of catalyst and reactant). These two model compounds were selected because they represent major reactants (xylose monomer in hemicelluloses) or intermediates (furan) during biomass pyrolysis. Insights into the mechanism of furan and xylose conversion by pyrolysis will be discussed based on in situ TP-IR experimental results.

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