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Tungstated zirconia catalyzed bromination of phenol red under nearly neutral solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
49019 46541 2006 8 PDF Available
Title
Tungstated zirconia catalyzed bromination of phenol red under nearly neutral solution
Abstract

The performance of tungstated zirconia catalysts prepared by co-precipitation (WZ) and impregnation (W/m-ZrO2) techniques in phenol red bromination reaction was tested. Both types of catalysts showed excellent activity in this reaction in aqueous solution. The activity of WZ increases as the W loading decreases and the most active 0.6WZ catalyst contained highly dispersed WOx of low surface density on zirconia. The W/m-ZrO2 catalysts showed even higher activity in this reaction but maximum performance is observed for 1.3W/m-ZrO2 instead. The active site for the redox reaction is probably the monomer or dimer of WOx with a single oxo group whereas low surface density of WOx provides enough space on zirconia for the adsorption of phenol red without blocking the redox sites.

Keywords
Tungstated zirconia; Mesoporous zirconia; Phenol red; Bromination; XPS; EXAFS
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Tungstated zirconia catalyzed bromination of phenol red under nearly neutral solution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 63, Issues 1–2, 22 March 2006, Pages 1–8
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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