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The dispersion of Keggin-type P/Mo polyoxometalates inside silica gel, and the preparation of catalysts for the oxidation of isobutane to methacrolein and methacrylic acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
43657 45981 2007 7 PDF Available
Title
The dispersion of Keggin-type P/Mo polyoxometalates inside silica gel, and the preparation of catalysts for the oxidation of isobutane to methacrolein and methacrylic acid
Abstract

Keggin-type P/Mo polyoxometalates (POM) were dispersed in a high-surface-area silica gel by means of a co-gelation procedure, in order to prepare catalysts for the gas-phase oxidation of isobutane to methacrolein and methacrylic acid. The aim was the dilution of the active phase, in order to favor the dispersion of the considerable reaction heat and limit the oxidative degradation of the desired products. However, the diluted heteropolyacid was less stable than the undiluted one, because of the exchange between P and Si as the heteroatom. When the gel was prepared in the presence of tetrapropylammonium hydroxide, the thermal decomposition of the latter generated the ammonium ion that replaced for protons in the cationic position of the POM. This enhanced the structural stability of the diluted POM at 350 °C under reaction conditions. However, no improvement of the catalytic performance was obtained for the diluted catalysts as compared to the undiluted systems, because of the combustion of methacrylic acid, of the modification of the POM redox properties and of the considerable extent of POM decomposition.

Keywords
Isobutane oxidation; Methacrylic acid; Keggin heteropolycompounds; Polyoxometalates; Silica gel
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The dispersion of Keggin-type P/Mo polyoxometalates inside silica gel, and the preparation of catalysts for the oxidation of isobutane to methacrolein and methacrylic acid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 325, Issue 2, 15 June 2007, Pages 263–269
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
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