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The use of low-nuclearity oxoperoxo molybdenum species to achieve high dispersions on zirconia materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
43595 45978 2007 14 PDF Available
Title
The use of low-nuclearity oxoperoxo molybdenum species to achieve high dispersions on zirconia materials
Abstract

Molybdenum(VI) species have been deposited on zirconia materials by adsorption equilibrium procedures using two precursors: (i) an isopolyanion salt: ammonium heptamolybdate and (ii) low-nuclearity oxoperoxo molybdenum complexes. Two zirconia supports have been considered: calcined zirconia (ZrO2) and the parent zirconium oxyhydroxide (ZrOx(OH)4−2x). After drying, the catalysts have been calcined and characterized by chemical analysis, powder X-ray diffraction, thermogravimetry, Raman and UV–vis diffuse reflectance spectroscopies, X-ray photoelectron spectroscopy, nitrogen physisorption experiments, and TEM and EDX analysis. In contrast to ZrO2, quantitative grafting of molybdenum species can be obtained when zirconium oxyhydroxide is used. With this material, the anchoring of low-nuclearity oxoperoxo species leads to higher specific surface areas than with ammonium heptamolybdate, and hence to lower molybdenum surface densities.

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Keywords
Zirconia; Hydrogen peroxide; Molybdenum; Oxoperoxo complexes
First Page Preview
The use of low-nuclearity oxoperoxo molybdenum species to achieve high dispersions on zirconia materials
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 325, Issue 1, 30 May 2007, Pages 140–153
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis