Catalytic Activities of Transition Metal Phosphides for NO Dissociation and Reduction With CO

Z. Yao, X. Qiao, D. Liu, Y. Shi and Y. Zhao

Abstract
A series of metal phosphides (MoP, WP, Co2P, Fe2P and Ni2P) were synthesized by H2-temperature-programmed reduction method. Amongst these phosphides, Fe2P was found to show a considerably higher activity for NO dissociation than other phosphides. Herein, it was firstly used as a catalyst for NO reduction with CO. Although the Fe2P catalyst showed an excellent activity for NO conversion to N2, there was a competition between NO reduction by CO and Fe2P oxidation by oxygen originated from NO dissociation. A complete equality of NO conversion and NO reduction degree can be obtained after increasing CO concentration in the system, which demonstrated that a catalytic redox cycle can be established on Fe2P catalyst, and hence in-situ oxidation of bulk Fe2P was avoided.

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Keywords
Fe2P, NO reduction, NO dissociation, catalytic redox cycle, bulk oxidation