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Preparation, characterization and catalytic activity of tin oxide-supported 12-tungstophosphoric acid as a solid catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
43266 45960 2008 8 PDF Available
Title
Preparation, characterization and catalytic activity of tin oxide-supported 12-tungstophosphoric acid as a solid catalyst
Abstract

A series of solid acid catalysts were synthesized by incipient wetness impregnation method by varying the wt% of 12-tungstophosphoric acid (TPA) on tin oxide. The prepared catalysts were characterized by thermal analysis, XRD, FT-IR and BET surface area. The acidity of the catalyst was measured by different techniques. The suitability of the materials was studied for acid-catalyzed esterification reaction using acetic acid and amyl alcohol. The acidity measurements showed that the total acidity increases with the rise of TPA content up to 20 wt% (monolayer coverage) and decreases thereafter. FT-IR spectra of pyridine adsorbed on the catalysts showed the presence of both Brønsted and Lewis acidities. Material with 20 wt% TPA on tin oxide having high surface area and acid sites acts as the better catalyst for esterification reaction. For the material that exhibits the optimum catalytic activity, selective poisoning of the potential catalytic centers revealed that Brønsted sites play the major role in carrying out the reaction. The straight-line plots of −ln(1-ester formed) versus catalyst weights support that the esterification reaction obeys first-order kinetics. The reusability study justifies that the catalyst is stable and active.

Graphical abstractA series of solid acid catalysts were synthesized by incipient wetness impregnation method by varying the wt% of 12-tungstophosphoric acid (TPA) on tin oxide. The acidity measurements showed that the total acidity increases with the rise of TPA content up to 20 wt% (monolayer coverage) and decreases thereafter. FT-IR spectra of pyridine adsorbed on the catalysts showed the presence of both Brønsted and Lewis acidities. Material with 20 wt% TPA on tin oxide having high surface area and acid sites acts as the better catalyst for esterification reaction. For the material that exhibits the optimum catalytic activity, selective poisoning of the potential catalytic centers revealed that Brønsted sites play the major role in carrying out the reaction. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Tin oxide; 12-Tungstophosphoric acid; Surface acidity; Esterification reaction; Amyl acetate; Reaction mechanism; Selective poisoning
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Preparation, characterization and catalytic activity of tin oxide-supported 12-tungstophosphoric acid as a solid catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 343, Issues 1–2, 1 July 2008, Pages 109–116
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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Full-text PDF Download
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