Evidence of a metal-support interaction in sol-gel derived Cu-ZrO2 catalysts for CO hydrogenation |
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Authors: | Y Sun P A Sermon |
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Affiliation: | (1) Solids and Surface Research Group, Department of Chemistry, Brunel University, UB8 3PH Uxbridge Middx, UK;(2) Present address: Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001 PR China |
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Abstract: | Sol-gel derived Cu/ZrO2 catalysts have recently been shown to have high activity and selectivity toward methanol synthesis. TPR, TEM, in situ XRD and N2O decomposition have now been used to characterize the active sites in such catalysts over a wide range of Cu concentration. Copper is shown to be in two forms: surface aggregates (or particulate) and dispersed copper in the ZrO2 substitutional sites. The proportion of the former increases with an increasing Cu content, while the overall strength of the Cu-ZrO2 interaction simultaneously decreases. The activity in CO/CO2 hydrogenation showed no evident correlation with the total Cu surface area, but rather with the concentration of highly-dispersed form of copper. This is taken to indicate that the copper in the substitutional sites of ZrO2 is predominantly responsible for and associated with the active sites on Cu/ZrO2 for CO/CO2 hydrogenation. |
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Keywords: | metal-support interactions sol-gels Cu-ZrO2 CO hydrogenation |
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