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Performance of H‐ZSM‐5‐supported bimetallic catalysts for the combustion of polluting volatile organic compounds in air
Author(s) -
Abdullah Ahmad Zuhairi,
Abu Bakar Mohamad Zailani,
Bhatia Subhash
Publication year - 2005
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1278
Subject(s) - coke , catalysis , space velocity , chemistry , chromium , dehydrogenation , benzene , bimetallic strip , copper , inorganic chemistry , organic chemistry , nuclear chemistry , selectivity
The performance of H‐ZSM‐5‐supported bimetallic catalysts with chromium as the base metal in the combustion of ethyl acetate and benzene is reported. A reactor operated from 100 to 500 °C at a gas hourly space velocity (GHSV) of 32 000 h −1 was used for study of the activity. A combination of 1.0 wt% chromium and 0.5 wt% copper yielded a catalyst (Cr 1.0 Cu 0.5 /Z) with improved conversion and carbon dioxide yield. Cr 2 O 3 (Cr 3+ ) and CuO (Cu 2+ ) were the predominant metal species in the catalyst. In agreement with the Mars–van Krevelen model, improved reducibility of Cr 3+ in the presence of Cu 2+ led to an improvement in activity. The copper content in Cr 1.0 Cu 0.5 /Z also favored the formation of deep combustion products. Condensation and subsequent growth of coke precursors in the catalyst pores led to the formation of a softer and less aromatic coke fraction while dehydrogenation activity on acid sites formed a harder and more aromatic coke fraction. The use of Cr 1.0 Cu 0.5 /Z favored the formation of lower molecular weight intermediates, leading to reduction in formation of softer coke. Copyright © 2005 Society of Chemical Industry