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Mode of zeolite catalysts deactivation during chlorinated VOCs oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
44150 46005 2007 7 PDF Available
Title
Mode of zeolite catalysts deactivation during chlorinated VOCs oxidation
Abstract

The catalytic oxidation of tetrachloroethylene (PCE), chosen as model for chlorinated hydrocarbons, was investigated over Pt/HY, Pt/NaY and Pt/NaX under humid conditions at a space velocity of 15,300 h−1. PCE is selectively transformed into carbon dioxide (CO2) and hydrochloric acid (HCl) over all catalysts studied in this work. 1.2%Pt/HY exhibits the highest activity with the complete conversion of PCE at 500 °C and undergoes no significant deactivation after 4 h of reaction. It was also highlighted in this work, that water vapour plays a preponderant role for PCE transformation and limits catalyst deactivation. On the other hand, platinum-exchanged sodic faujasites (Pt/NaFAU) are also active in PCE transformation but it appeared that 1%Pt/NaX underwent a high and rapid deactivation by the formation of sodium chloride (NaCl) clusters.

Graphical abstractThe catalytic oxidation of tetrachloroethylene (PCE), chosen as model for chlorinated hydrocarbons, was investigated over Pt/HY, Pt/NaY and Pt/NaX under humid conditions at a space velocity of 15,300 h−1. PCE is selectively transformed into CO2 and HCl over all catalysts studied in this work. 1.2%Pt/HY exhibits the highest activity with the complete conversion of PCE at 500 °C and undergoes no significant deactivation after 4 h of reaction. It was also highlighted in this work, that water vapour plays a preponderant role for PCE transformation and to limit catalyst deactivation. On the other hand, Pt/NaFAU catalysts are also active in PCE transformation but it appeared that 1%Pt/NaX underwent a high and rapid deactivation by the formation of NaCl clusters.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Deactivation; Catalytic oxidation; Chlorinated VOCs; Zeolite; FAU
First Page Preview
Mode of zeolite catalysts deactivation during chlorinated VOCs oxidation
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 327, Issue 2, 15 August 2007, Pages 211–217
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis