High-temperature ammonia oxidation over a platinum catalyst under conditions of the parallel formation of nitrogen-containing products
Tóm tắt
Experimental data on the effect of the temperature of air containing low ammonia concentrations on the temperature and rate of catalytic ammonia combustion over a platinum catalyst as a function of the NH3 concentration and catalyst particle diameter are analyzed with account taken of thermal radiation under the assumption that nitrogen and nitric oxide form in parallel. At relatively low air temperatures (near the combustion extinction point), the ammonia combustion temperature is determined by the nitrogen formation reaction (which releases a larger amount of heat and is characterized by a lower activation energy). At higher air temperatures and ammonia concentrations, the combustion temperature is determined by the nitric oxide formation reaction (which releases a smaller amount of heat and is characterized by a higher activation energy). The dependence of the critical temperature of the gas mixture on the catalyst particle diameter under conditions of the catalytic autoignition of the combustible gas and combustion extinction (at low ammonia concentrations) has been determined and analyzed for the case in which there is radiative heat transfer between the gas and the cold walls of the reactor.
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