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The mechanism of nitric oxide reduction with ammonia to form N/sub 2/, H/sub 2/O and N/sub 2/O both in the presence and in the absence of O/sub 2/ over the following series of catalysts, unsupported V/sub 2/O/sub 5/, V/sub 2/O/sub 5/ on TiO/sub 2/, V/sub 2/O/sub 5/ on SiO/sub 2//Al/sub 2/O/sub 3/, and V/sub 2/O/sub 5/ on Al/sub 2/O/sub 3/, has been investigated with the aid of labeled O/sub 2/ and labeled NH/sub 3/ at 400/sup 0/C. The behavior of ammonia was studied both in the presence and in the absence of O/sub 2/. The presence of labeled O/sub 2/ gives extra information about the product distribution and the reaction mechanism. Evidence is given that ammonia does not react with O/sub 2/ or O from any source during the reaction, but that nitrogen and nitrous oxide were produced by a reaction involving all three species, NO, NH/sub 3/, and/or O/sub 2/. Nitrous oxide and water are both formed at two different sites of the catalyst. A series of transient tracing studies were performed in a plug-flow reactor using /sup 15/NH/sub 3/ and /sup 18/O/sub 2/. Both /sup 15/NN and /sup 15/NNO were produced on the unsupported V/sub 2/O/sub 5/, V/submore » 2/O/sub 5/ on TiO/sub 2/, V/sub 2/O/sub 5/ on SiO/sub 2//Al/sub 2/O/sub 3/, and V/sub 2/O/sub 5/ on Al/sub 2/O/sub 3/ with very high selectivities. The mechanism of the reaction of NO, NH/sub 3/, and O/sub 2/, proposed in a previous paper, is further evaluated on the basis of this new experimental evidence.« less

Mechanism of the reaction of nitric oxide, ammonia, and oxygen over vanadia catalysts. 2. Isotopic transient studies with oxygen-18 and nitrogen-15