CHABAZITE TYPE ZEOLITE AND PROCESS FOR PRODUCTION THEREOF, COPPER-CARRYING LOW-SILICA ZEOLITE, NOX REDUCTIVE ELIMINATION CATALYST INCLUDING SAID ZEOLITE, AND METHOD FOR REDUCTIVE ELIMINATION OF NOX EMPLOYING SAID 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.