Electrochemical promotion of Pt impregnated catalyst for the treatment of automotive exhaust emissions
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This study has shown that Pt/K-βAl2O3 electrochemical catalyst can reach high catalytic activity for the selective reduction of N2O by C3H6. In addition it was also demonstrated that Electrochemical Promotion could be a solution to reduce the adverse effects of poisons (O2 and H2O) on the catalytic activity. For instance, in the presence of O2 (1%) and H2O (3%) in the reactive stream, electrochemical pumping of potassium ions to the Pt catalyst increased the N2O reduction rate by a factor of 7.4 at 400 °C. We have also demonstrated that the wet impregnation procedure led to a very stable Pt film, with very good resistance to thermal sintering under real operation conditions. Therefore, the use of Pt impregnated films deposited on K-βAl2O3 solid electrolytes is a feasible solution for the treatment of automotive exhaust gases.
KeywordsSelective catalytic reduction N2O Electrochemical promotion Pt impregnated catalyst NEMCA effect
Financial support by the Ministerio de Educación y Ciencia of Spain (Projects: CTQ2004-07350-C02-01/PQ and CTQ2007-62512/PPQ) and the European Marie-Curie EFEPOC project (MSCF-CT-2006-046201) are gratefully acknowledged.
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