Abstract
The mechanism of methane activation in CH 4 CO 2 reaction over various unsupported and supported Mo 2C catalysts was studied by means of an isotopic tracer technique employing 13CH 4 and CD 4 as tracers. Incorporation of carbide carbons into CO took place in the case of CH 4 CO 2 reaction over unsupported Mo 2C, which was retarded significantly by dispersing Mo 2C onto ZrO 2 support. Methane dissociation step was also retarded significantly over supported Mo 2C catalysts, and the durability of the catalysts was improved by preventing inactive carbon accumulation. By dispersing Mo 2C on Al 2O 3, novel active acidic sites were produced, where CH 4 CD 4 exchange reaction took place even below room temperature through an associative mechanism.
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