SILICOALUMINOPHOSPHATE SALT AND NITROGEN OXIDE REDUCTION CATALYST USING SAME

摘要

Provided is a silicoaluminophosphate salt for which deterioration of the nitrogen oxide reduction rate is low even when exposed to an atmosphere containing moisture. A silicoaluminophosphate salt which comprises at least one type of metal selected from the group consisting of group VIIIB elements, group IB elements and group VIIB elements of the Periodic Table, and has a CHA structure and an AEI structure, the ratio of the AEI structure exceeding 50%. In this silicoaluminophosphate salt, the at least one type of metal from group VIIIB elements and group IB elements of the Periodic Table is preferably copper.