Abstract
The exchange reaction between methane and deuterium and the cracking of propane in the temperature range 100 ° to 200 ° have been used to study variations in catalytic activity in the PtPd and PdRh alloy series. Stepwise exchange was exhibited by both Pt and Pd, CH 3D being the most abundant initial product and the other deuteromethanes appearing in order. Rh showed predominantly multiple exchange at the higher temperatures with the initial appearance of CD 4. Stepwise exchange was the most important mechanism with all alloy samples although the contribution of multiple exchange increased with increasing temperature. The order of activity of the pure metals followed the sequence Pt Rh Pd at 150 ° for both exchange and cracking reactions and the binary alloys showed intermediate activities. A rough correlation between atomic radius and exchange mechanism was observed and the mechanism of the exchange reaction is discussed.
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