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Study of NH3 Formation and Its Control in the NOx Catalyst System
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English
Abstract
Suppression of NH3 formation over NOx catalysts has been the subject of several reports in recent years. However, there are very few reports relating to the effects of modifications of both feed gas conditions and catalyst usage. Therefore, NH3 formation was investigated as a function of such feed gas boundary conditions as CO concentration, CO/O2 ratio, space velocity, linear velocity and catalyst bed temperature. Both fresh and aged NOx catalysts were used. Longitudinal patterns of NH3 formation in monolithic NOx catalyst were also determined. Based on these results, several ideas were tested to reduce NH3 formation in the NOx catalyst through control of feed H2, O2, CO and HC concentrations. Finally, the possibility of extending the optimum A/F range of a NOx catalyst toward leaner A/F ratios by the introduction of methane ahead of the NOx catalyst is discussed.
Although these studies increased our knowledge of NOx catalysis and use of NOx catalysts, many engineering problems still remain to be solved before NOx catalysts are used in production vehicles.
Authors
Citation
Kuroda, H., Nakajima, Y., Saito, T., Oguri, T. et al., "Study of NH3 Formation and Its Control in the NOx Catalyst System," SAE Technical Paper 760200, 1976, https://doi.org/10.4271/760200.Also In
References
- Meguerian G. H. Lang C. R. “NOx Reduction Catalysts for Vehicle Emission Control.” SAE Transactions 80 1971 Paper No. 710291
- Meguerian G. H. Hirschberg E. H. Rakowsky F. W. Lang C. R. Schock D. H. “NOx Reduction Catalysts for Vehicle Emission Control.” SAE Paper No. 720480 1972
- Meguerian G. H. Rakowsky F. W. “NO Reduction Catalyst Development.” SAE Paper No. 750417 1975
- Meguerian G. H. “Nitrogen Oxide: Formation, Suppression and Catalytic Reaction.” Proceedings of the 8th World Petroleum Congress 6 Applied Science Publications, Ltd 1971 21 28
- “The Catalytic Chemistry of Nitrogen Oxides.” Klimisch R. L. Larson J. G. Plenum Press N. Y. 1975