CHA-ZEOLITE, METHOD FOR MANUFACTURING THIS ZEOLITE, HONEYCOMB CATALYST, AND EXHAUST GAS PURIFYING APPARATUS

摘要

The present invention provides a zeolite that shows high NOx converting performance and is excellent in NOx converting performance especially in a high temperature range of exhaust gases. The present invention provides a zeolite having a CHA structure, the zeolite having a SiO 2 /Al 2 O 3 composition ratio of less than 15, the zeolite containing K in an amount of 0.1 to 1% by mass in terms of K 2 O.