Molecular Basis for the Design of Transition-Metal Oxide Catalysts for Selective Catalytic Reduction of NO by Hydrocarbons

摘要

This study demonstrates the intrinsic factors affecting the activity of transition metal oxide catalysts for C_3H_6-SCR. On the basis of the molecular information from XAFS and in-situ FTIR spectroscopies, the structure-activity relationship is examined in a molecular level to obtain intrinsic fators affecting the catalytic activity. The activity of metal oxide catalysts was determined not only by teh kind of metal oxides but also by the dispersion, coordination, and local electronic states of the metal cation, which can be influenced by the surrounding oxide matrix. The results provide a criterion for a rational design of effective HC-SCR catalysts.