CHABAZITE-TYPE ZEOLITE AND METHOD FOR PRODUCING SAME, COPPER LOADED LOW-SILICA ZEOLITE AND NOX REDUCTIVE REMOVAL CATALYST CONTAINING THE ZEOLITE, AND METHOD OF NOX REDUCTIVE REMOVAL USING THIS CATALYST

摘要

The chabazite type zeolite of the present invention has an SiO2/Al2O3 mol ratio of less than 15, and an average particle size of at least 1.0 µm and no more than 8.0 µm. The chabazite type zeolite of the present invention has outstanding durability and heat resistance, and, in addition, copper-carrying chabazite type zeolite raised the reduction percentage of NOx at low temperatures compared with prior copper-carrying chabazite type zeolite.