Abstract
We investigate the relationship between the H\(_2\):NO ratio and NH\(_3\) formation over alumina supported Pt and Pd catalysts. By kinetic studies and in situ infrared spectroscopy, we report that NH\(_3\) formation is not only sensitive to the catalyst formulation but equally dependent on the feed gas composition and temperature. Specifically, we identify that hydrogen plays an important role in the dissociation of NO at low temperature. We also show that the support material itself plays a vital role in the ammonia formation mechanism due to the redox behaviour of NO adsorption at low temperature. This was unexpected as the noble metal is generally considered to be the active phase for the reaction of NO and H\(_2\).
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Acknowledgments
This work was financially supported by the Swedish Energy Administration through the FFI program and the Competence Centre for Catalysis, which is financially supported by Chalmers University of Technology, the Swedish Energy Agency and the member companies: AB Volvo, ECAPS AB, Haldor Topsøe A/S, Volvo Car Corporation, Scania CV AB, and Wärtsilä Finland Oy.
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Adams, E.C., Skoglundh, M., Gabrielsson, P. et al. Passive SCR: The Effect of H\(_2\) to NO Ratio on the Formation of NH\(_3\) Over Alumina Supported Platinum and Palladium Catalysts. Top Catal 59, 970–975 (2016). https://doi.org/10.1007/s11244-016-0576-0
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DOI: https://doi.org/10.1007/s11244-016-0576-0