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Effect of mixed γ- and χ-crystalline phases in nanocrystalline Al2O3 on the dispersion of cobalt on Al2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
52336 46870 2008 6 PDF Available
Title
Effect of mixed γ- and χ-crystalline phases in nanocrystalline Al2O3 on the dispersion of cobalt on Al2O3
Abstract

This paper reports the results of a study into the effect of mixed γ and crystalline phases in Al2O3 on the characteristics and catalytic activities for CO hydrogenation of Co/Al2O3 catalysts. The catalysts were characterized by X-ray diffraction, N2 physisorption, transmission electron microscopy, and H2 chemisorption. Increasing Co loading from 5 to 20 wt% for the mixed phase Al2O3-supported Co catalysts resulted in a constant increase in both the number of cobalt metal active sites and the hydrogenation activities. However, for those supported on γ-Al2O3, Co dispersion increased up to 15 wt%Co and declined at 20 wt%Co loading. It is suggested that the spherical-shape like morphology of the χ-phase Al2O3 prevented agglomeration of Co particles, especially at high Co loadings.

Keywords
Nanocrystalline alumina; Crystalline phase; Cobalt catalyst; CO hydrogenation; χ-Alumina; γ-Alumina
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Effect of mixed γ- and χ-crystalline phases in nanocrystalline Al2O3 on the dispersion of cobalt on Al2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 2, February 2008, Pages 207–212
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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Full-text PDF Download
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