Effect of mixed γ- and χ-crystalline phases in nanocrystalline Al2O3 on the dispersion of cobalt on Al2O3 |
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| Affiliation: | 1. Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;2. Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakorn Pathom 73000, Thailand;3. Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC, 29634, USA |
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| 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. |
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