METHOD FOR PREPARING MOLECULAR SIEVE SCR CATALYST, AND CATALYST PREPARED THEREBY

摘要

A method for preparing a molecular sieve SCR catalyst, and a catalyst prepared by using the method. The method comprises: mixing several molecular sieves, and then performing ion exchange modification treatment by means of transition metal or rare-earth metal; loading Fe by means of isopyknic impregnation, and loading Cu by means of one-stage or multistage liquid ion exchange; roasting the loaded catalyst powder; adding water and a binder; performing ball milling to prepare a slurry; coating a carrier with the slurry; and drying and roasting to obtain the molecular sieve SCR catalyst. The catalyst has a wide active temperature window and excellent hydrothermal aging resistance, and the N ₂O generation amount of the catalyst is significantly lower than that of previous catalysts of the same type.