On the vital roles of zeolitic matrix in catalysts for deNO χ, reactions under conditions similar to diesel engine exhaust

Abstract

The physical and chemical properties of a Cu-ion-exchanged Al-silicate with an MFI or A structure and Cu-containing silicate, in which Cu was incorporated into MFI or A structure were compared. It was found that the stability and catalytic performance of Cu-containing silicates were superior to those of Cu-ion exchanged Al-silicates. Furthermore, the advantageous factors of zeolite materials for deNO χ, reaction were investigated by simulating the acid properties and the thermal stability of the framework. Such metal-containing silicate catalysts have large potentials as the deNO χ, catalysts for diesel engine exhaust. The reaction characteristic was explained by the microscopic sequential reaction (MSR) mechanism.