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Acid site-assisted vapor-phase oxidation of ethene to acetic acid over palladium with silica-supported tungstosilicic acid and tungstated zirconia

Paper ID Volume ID Publish Year Pages File Format Full-Text
43389 45967 2008 8 PDF Available
Title
Acid site-assisted vapor-phase oxidation of ethene to acetic acid over palladium with silica-supported tungstosilicic acid and tungstated zirconia
Abstract

The selective oxidation of ethene to acetic acid in the vapor phase over solid acid-supported Pd catalyst was investigated to elucidate the reaction mechanism and the roles of Pd and acidic sites in promoting the reaction. Two catalysts, Pd–H4SiW12O40/SiO2 and Pd/WO3–ZrO2, exhibited high catalytic activity. Variations in product distribution with contact time, the requirement for the presence of water vapor for the reaction to occur, and the reactivities of possible reaction intermediates indicated that acetic acid is formed via an acetaldehyde intermediate which is produced in a Wacker-type reaction, while the role of the acid sites is to re-oxidize Pd0 into Pd2+ in the presence of O2. It was concluded that catalytic efficiency is dependent on maximization of the interface between metallic Pd and acidic surface by establishing an appropriate ratio of Pd and acidic sites.

Graphical abstractSelective oxidation of ethene to acetic acid in the vapor phase over Pd–H4SiW12O40/SiO2 and Pd/WO3–ZrO2 proceeds through an acetaldehyde intermediate which is produced in a Wackertype reaction. In this reaction, acid sites on H4SiW12O40/SiO2 and WO3–ZrO2 assist the re-oxidation of Pd0 into Pd2+ in the presence of O2.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ethene oxidation; Acetic acid; Pd–H4SiW12O40/SiO2; Pd/WO3–ZrO2; Wacker reaction; Acidic site
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Acid site-assisted vapor-phase oxidation of ethene to acetic acid over palladium with silica-supported tungstosilicic acid and tungstated zirconia
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 350, Issue 1, 15 November 2008, Pages 103–110
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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