Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10244729 | Journal of Catalysis | 2005 | 13 Pages |
Abstract
NO reduces HNO3 to HONO and surface nitrates to nitrites on a BaNa-Y zeolite, and it reacts with NO2 to form N2O3. Data are also presented which show that adsorbed NO+ reacts with water to form HONO. In the presence of NH3 and H2O these processes lead to the formation of ammonium nitrite, which efficiently decomposes near 100â°C to N2 + H2O, effecting the catalytic reduction of NOx to N2. A criterion for this path is that the optimum yield of N2 is obtained with an equimolar mixture of NO + NO2. Since ammonium nitrate, which can also form on this catalyst, does not significantly decompose at 200â°C, a typical temperature for diesel exhaust, the reduction of nitrate to nitrite serves to regenerate active sites on the BaNa-Y zeolite.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Young Hoon Yeom, Juan Henao, Mei Jun Li, Wolfgang M.H. Sachtler, Eric Weitz,