Electrochemical promotion of Pt impregnated catalyst for the treatment of automotive exhaust emissions

Author:

Antonio de Lucas-Consuegra   Fernando Dorado   Carmen Jiménez-Borja and José Luís Valverde  

Journal:

Journal of Applied Electrochemistry

Issue Date:

2008

Abstract(summary):

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 掳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.

Page:

1151-1157