Abstract
Ethane hydrogenolysis and carbon monoxide hydrogenation were studied over two niobia (Nb 2O 5)-supported nickel catalysts, containing 2 and 10 wt% nickel, which had been reduced in hydrogen at 573 or 773 K for 1 h. Compared to silica-supported nickel catalysts, these samples had lower ethane hydrogenolysis activity but higher CO hydrogenation activity. For some samples a different experimental rate law for ethane hydrogenolysis was observed. In CO hydrogenation, all samples showed a shift in product distribution to hydrocarbons higher than methane, and olefinic products were detected. These observations were attributed to strong metal-support interaction (SMSI). The use of these chemical probes identified different manifestations of SMSI that depend on crystallite size and reduction treatment. On the basis of these manifestations, a hierarchy consisting of five stages was developed to rank the extent of interaction in Ni Nb 2O 5 catalysts. A mechanism of SMSI was proposed for a physical explanation of this hierarchy.
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