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Performance study of modified ZSM‐5 as support for bimetallic chromium–copper catalysts for VOC combustion
Author(s) -
Abdullah Ahmad Zuhairi,
Abu Bakar Mohamad Zailani,
Bhatia Subhash
Publication year - 2004
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.1053
Subject(s) - space velocity , bimetallic strip , catalysis , chromium , copper , chemistry , zsm 5 , coke , inorganic chemistry , silicon tetrachloride , benzene , reactivity (psychology) , zeolite , nuclear chemistry , silicon , selectivity , organic chemistry , medicine , alternative medicine , pathology
The catalytic performance of bimetallic chromium–copper supported over untreated ZSM‐5 (CrCu/Z), ZSM‐5 treated with silicon tetrachloride (Cr–Cu/SiCl 4 ‐Z) and ZSM‐5 treated with steam (Cr–Cu/H 2 O‐Z) is reported. The activity is based on the combustion of ethyl ethanoate and benzene at a feed concentration of 2000 ppm and a gas hourly space velocity (GHSV) of 32 000 h −1 . Due to higher reactivity and larger molecular size compared with that of water molecules, SiCl 4 reacted at the external surface of ZSM‐5 crystals. Cr–Cu/SiCl 4 ‐Z and Cr–Cu/H 2 O‐Z both gave slightly lower conversion and carbon dioxide yield compared with Cr–Cu/Z. This was attributed to larger active metal crystallites formed in the mesopores and narrowing pore mouth and pore intersection by extraframework species. Cr–Cu/SiCl 4 ‐Z and Cr–Cu/H 2 O‐Z both had reduced concentration and strength of acid sites, thus making them less susceptible to deactivation by coking. The coke accumulated by these two catalysts was relatively softer and more easily decomposed in oxygen during catalyst regeneration. Copyright © 2004 Society of Chemical Industry