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The effect of synergy between Cr2O3-CeO2 and USY zeolite on the catalytic performance and durability of chromium and cerium modified USY catalysts for decomposition of chlorinated volatile organic compounds

Paper ID Volume ID Publish Year Pages File Format Full-Text
46419 46439 2012 11 PDF Available
Title
The effect of synergy between Cr2O3-CeO2 and USY zeolite on the catalytic performance and durability of chromium and cerium modified USY catalysts for decomposition of chlorinated volatile organic compounds
Abstract

The chromium and cerium modified USY zeolite catalysts (Cr2O3-CeO2-USY) were prepared by impregnation method and investigated in terms of catalytic decomposition of dichloromethane (DCM), trichloroethylene (TCE) and 1,2-dichloroethane (DCE). The results show that there are two types of active sites in the catalysts. The acidic site is the active center for dehydrochlorination of CVOCs, and the metallic xoide is the center providing active oxygen species for CVOCs deeper oxidation. The interaction between Cr2O3 and CeO2 species optimizes the concentration ratio of strong acid sites to weak acid sites and improves the mobility of oxygen species over Cr2O3-CeO2-USY catalysts, which is beneficial to the dehydrochlorination and deeper oxidation of chlorinated volatile organic compounds (CVOCs), respectively. Cr2O3-CeO2-USY catalyst with 17.5 wt.% loading of Cr2O3 (17.5Cr2O3-12.5CeO2-USY) presents better catalytic performance for CVOCs decomposition along with higher selectivity to HCl and CO2 formation, which can be due to the higher percentage of strong acidity, more accessible oxygen species, and the stronger synergy between Cr2O3-CeO2 and USY zeolite. In addition, the stronger interaction between Cr2O3 and CeO2, along with the synergy between Cr2O3-CeO2 and USY zeolite over 17.5Cr2O3-12.5CeO2-USY results in less coke deposit, slight HCl attack on the catalysts and improved resistance to chlorination of active components. Therefore, 17.5Cr2O3-12.5CeO2-USY shows the better durability and structure stability during the long term exposure to DCE.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Interaction between Cr2O3 and CeO2 optimizes the acidity distribution over Cr2O3-CeO2-USY. ► Interaction between Cr2O3 and CeO2 improves the mobility of oxygen species in Cr2O3-CeO2-USY. ► Synergy between Cr2O3-CeO2 and USY enhances the catalytic performance for CVOCs destruction. ► Synergy between Cr2O3-CeO2 and USY improves the durability of the catalyst for DCE oxidation.

Keywords
Cr2O3-CeO2-USY catalysts; CVOCs decomposition; Deeper oxidation ability; Catalytic performance; Durability
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The effect of synergy between Cr2O3-CeO2 and USY zeolite on the catalytic performance and durability of chromium and cerium modified USY catalysts for decomposition of chlorinated volatile organic compounds
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 115–116, 5 April 2012, Pages 179–189
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us