Abstract
Investigations were done on the HCN synthesis via the combustion of methane, air, and ammonia over Pt-Rh gauze catalyst. A pack of new catalyst required 60 to 80 hr to be fully activated. It could then maintain its economical life for several thousand hours. The relationships of catalyst activity with morphological change, crystal structure, surface area, and gauze impurities were defined. After external diffusion resistance was eliminated, maximum conversion of NH 3 to HCN was found at a certain contact time. During this period, the rate of HCN formation was approximately first order each with respect to NH 8 and CH 4.
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