Nitrous oxide reduction with ammonia over Co---MgO catalyst and the influence of excess oxygen |
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| Authors: | Ken-ichi Aika and Kenzo Oshihara |
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| Affiliation: | Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, Japan |
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| Abstract: | N2O decomposition on Co---MgO was studied under high (6.67 kPa) and low (75 Pa) N2O pressure and the effect of reductant (C2H6, NH3) was studied. The activity decays because of the strong adsorption of oxygen produced, while the reductant removed the adsorbed oxygen giving a steady catalysis. The reaction between NH3 and excess amount of O2 produced N2O as a main product. Although N2O gives the same intermediate (O) as O2 does, the former decomposition seems to proceed faster than the latter on Co---MgO. The reaction mechanism studied here was compared with the SCR (NO---NH3 in O2) reaction on V2O2-TiO2. Since NH3, N2O and O2 gives only N2 and water, Co---MgO can be a possible catalyst used in the boiler exhaust to reduce N2O concentration by adding ammonia. |
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| Keywords: | Co---MgO catalyst N2O decomposition |
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