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Structure and reactivity of zirconium oxide-supported ammonium salt of 12-molybdophosphoric acid catalysts ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
44050 46001 2006 8 PDF Available
Title
Structure and reactivity of zirconium oxide-supported ammonium salt of 12-molybdophosphoric acid catalysts ☆
Abstract

A series of catalysts with varying quantities of ammonium salt of 12-molybdophosphoric acid supported on zirconium dioxide was synthesized. The catalysts were characterized by nitrogen adsorption for BET surface area, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and 31P MAS NMR techniques to study the nature of the interactions of the active component with the support as a function of salt loading. The nature of the Keggin ion species (intact, fragmented or decomposed) formed on the support varies with the extent of loading of the heteropolyacid salt. A good correlation was obtained between the extent of formation of lacunary Keggin ion species and the activity of the catalysts during the ammoxidation of 2-methylpyrazine at different reaction temperatures.

Keywords
Ammonium salt of 12-molybdophosphoric acid; Zirconia; Ammoxidation of 2-methylpyrazine
First Page Preview
Structure and reactivity of zirconium oxide-supported ammonium salt of 12-molybdophosphoric acid catalysts ☆
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 300, Issue 2, 26 January 2006, Pages 139–146
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis