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Decoupling HZSM‐5 Catalyst Activity from Deactivation during Upgrading of Pyrolysis Oil Vapors
Author(s) -
Wan Shaolong,
Waters Christopher,
Stevens Adam,
Gumidyala Abhishek,
Jentoft Rolf,
Lobban Lance,
Resasco Daniel,
Mallinson Richard,
Crossley Steven
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402861
Subject(s) - catalysis , pyrolysis , zeolite , chemistry , chemical engineering , decoupling (probability) , inorganic chemistry , organic chemistry , control engineering , engineering
The independent evaluation of catalyst activity and stability during the catalytic pyrolysis of biomass is challenging because of the nature of the reaction system and rapid catalyst deactivation that force the use of excess catalyst. In this contribution we use a modified pyroprobe system in which pulses of pyrolysis vapors are converted over a series of HZSM‐5 catalysts in a separate fixed‐bed reactor controlled independently. Both the reactor‐bed temperature and the Si/Al ratio of the zeolite are varied to evaluate catalyst activity and deactivation rates independently both on a constant surface area and constant acid site basis. Results show that there is an optimum catalyst‐bed temperature for the production of aromatics, above which the production of light gases increases and that of aromatics decrease. Zeolites with lower Si/Al ratios give comparable initial rates for aromatics production, but far more rapid catalyst deactivation rates than those with higher Si/Al ratios.