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Real‐Time Quantitative Operando Raman Spectroscopy of a CrO x /Al 2 O 3 Propane Dehydrogenation Catalyst in a Pilot‐Scale Reactor
Author(s) -
Sattler Jesper J. H. B.,
Mens Ad M.,
Weckhuysen Bert M.
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402649
Subject(s) - dehydrogenation , raman spectroscopy , catalysis , propane , coke , analytical chemistry (journal) , materials science , chemistry , organic chemistry , optics , physics
Combined operando UV/vis–Raman spectroscopy has been used to study the deactivation of CrO x /Al 2 O 3 catalyst extrudates in a pilot scale propane dehydrogenation reactor. For this purpose, UV/vis and Raman optical fiber probes have been designed, constructed and tested. The light absorption measured by operando UV/vis spectroscopy was used to correct for the effect of catalyst darkening. This makes operando Raman spectroscopy a quantitative technique to follow the formation of coke deposits on‐line during the first hour of catalytic propane dehydrogenation process. The probe was used to study the coke deposition at the top and bottom of the reactor. Differences in the rate of coke deposition were observed, which were related to the local temperature of the catalyst bed. The chemical nature of the coke deposits formed on a catalyst extrudate, as expressed by the D 1 /G ratio, was independent of reaction time as well as of the position of the catalyst extrudate within the reactor bed.