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Title: Role of Biopolymers in the Deactivation of ZSM-5 during Catalytic Fast Pyrolysis of Biomass

Rapid coking and catalyst deactivation are significant problems during catalytic fast pyrolysis of biomass. Cellulose and lignin were found to coke via different mechanisms, resulting in two distinct types of catalyst deactivation. Lignin pyrolysis vapors cause coke formation mainly by external surface coking without limiting access to the active acid sites in the microchannels. Lignin deactivates the surface cracking capability of ZSM-5, resulting in unreacted primary vapors passing through while maintaining aromatization reactions. Cellulose pyrolysis vapors generate coke mainly as an extension of the aromatization reactions on the acid sites, which leads to occlusion of the internal acid sites. This deactivates the upgrading reactions, resulting in decreased aromatics formation, generating oxygenated intermediates and increased alkylation of one-ring aromatics and reduced multi-ring aromatics selectivity. Furthermore, the results indicate that the decrease in aromatics formation observed during catalytic pyrolysis of biomass is primarily caused by the coke generated from the polysaccharide components.
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  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado State Univ., Fort Collins, CO (United States); Orbital ATK, Rocket Center, WV (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 2168-0485
Grant/Contract Number:
Accepted Manuscript
Journal Name:
ACS Sustainable Chemistry & Engineering
Additional Journal Information:
Journal Name: ACS Sustainable Chemistry & Engineering; Journal ID: ISSN 2168-0485
American Chemical Society (ACS)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
09 BIOMASS FUELS; catalytic pyrolysis; ZSM-5; deactivation; cellulose; lignin; coke
OSTI Identifier: