CO oxidation on Cu/MgO-SiO2 sol-gel derived catalysts

Sol-gel Cu//MgOSiO2 catalysts were prepared gelling tetraethoxysilane (TEOS), magnesium ethoxide and copper acetylacetonate at pH 3 and pH 9. The catalysts shown specific surface areas ca. 500 m2/g and 140 m2/g for pH 9 and pH 3 preparations respectively. Si(OH) and Si(OH)2 hydroxy groups were obser...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2003, Vol.26 (1-3), p.853-857
Main Authors: MANRIQUEZ, M. E, LOPEZ, T, GOMEZ, R
Format: Article
Language:English
Subjects:
Ammonia
Carbon monoxide
Catalysis
Catalysts
Catalytic activity
Catalytic reactions
Chemistry
Copper
Exact sciences and technology
Gelation
General and physical chemistry
Magnesium
Oxidation
Silicon dioxide
Sol-gel processes
Tetraethyl orthosilicate
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Sol-gel Cu//MgOSiO2 catalysts were prepared gelling tetraethoxysilane (TEOS), magnesium ethoxide and copper acetylacetonate at pH 3 and pH 9. The catalysts shown specific surface areas ca. 500 m2/g and 140 m2/g for pH 9 and pH 3 preparations respectively. Si(OH) and Si(OH)2 hydroxy groups were observed by MAS-RMN spectroscopy in both preparations. CO2-TPD and NH3-TPD desorption thermograms showed that acid and basic sites were formed on the catalysts surface. It has been found that the catalysts having the highest density of basic sites were the catalysts showing the highest activity for the CO oxidation. It is proposed that the catalytic activity depends of the relative Cu=1/Cu=2 stability given by the support acidity.
ISSN:0928-0707
1573-4846
DOI:10.1023/A:1020759902274