LOW-TEMPERATURE SCR CATALYST FOR DENITRATING DIESEL VEHICLE EXHAUST, AND PREPARATION METHOD THEREOF

摘要

Provided are a low-temperature SCR catalyst for denitrating diesel vehicle exhaust, and preparation method thereof. The catalyst uses a molecular sieve as a carrier, and uses metallic elements such as copper and iron as active components. The catalyst preparation method comprises: preprocessing the molecular sieve; conducting multiple equal-volume impreparations; after impreparation, drying to dehydrate, and calcining; and finally pulping and coating to prepare the catalyst. The catalyst employs base metals such as copper and iron instead of precious metals as active components, thus reducing costs, being harmless to humans, and being environmentally friendly. The preparation method of the catalyst is simple and feasible with low requirements for raw materials, employs a repeated but small-quantity method of equalvolume impregnation; and enables active ions to be dispersed more uniformly as compared with the existing conventional preparation methods, thus improving utilization and improving low-temperature catalytic activity and durability.