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Preparation and characterization of V-Ag-O catalysts for the selective oxidation of toluene

Paper ID Volume ID Publish Year Pages File Format Full-Text
42162 45913 2010 8 PDF Available
Title
Preparation and characterization of V-Ag-O catalysts for the selective oxidation of toluene
Abstract

V-Ag-O complex oxide catalysts with relatively high surface areas of 13–21 m2/g could be prepared by the heterogeneous azeotropic distillation (HAD) method. Specifically, V2O5 and AgNO3 were dissolved in aqueous solution of H2O2, followed by evaporation and drying in n-butanol at 353 K. Silver vanadates with highly dispersed nano silver particles in the layered structures of VOx might be formed during the preparation process, which were then turned into Ag0.68V2O5 and metallic silver during the reaction of selective oxidation of toluene at 573 K. Characterizations with microcalorimetric adsorption of NH3, temperature programmed reduction and isopropanol probe reactions showed that the V-Ag-O catalysts exhibited weaker surface acidity but stronger redox ability than the VOx, and therefore the better performance for the selective oxidation of toluene to benzaldehyde and benzoic acid. In addition, the V-Ag-O catalysts prepared by the HAD method exhibited much higher activity than its counterpart prepared by the co-precipitation for the conversion of isopropanol and the selective oxidation of toluene to benzaldehyde and benzoic acid in air.

Graphical abstractV-Ag-O complex oxide catalysts with relatively high surface areas of 13–21 m2/g could be prepared by the heterogeneous azeotropic distillation (HAD) method, which exhibited much higher activity and selectivity than the counterparts prepared by the co-precipitation (CP) method for the selective oxidation of toluene to benzaldehyde and benzoic acid.Figure optionsDownload full-size imageDownload high-quality image (90 K)Download as PowerPoint slide

Keywords
Heterogeneous azeotropic distillation drying; Silver vanadates; Surface acidity; Surface redox property; Selective oxidation of toluene
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Preparation and characterization of V-Ag-O catalysts for the selective oxidation of toluene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 379, Issues 1–2, 15 May 2010, Pages 7–14
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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