TRANSITION-METAL-CONTAINING ZEOLITE

摘要

The present invention relates to a transition-metal-containing aluminophosphate zeolite that is stable during water adsorption and desorption, has high catalytic performance, a high transition metal content, excellent transition metal dispersion, and high stability. The aluminophosphate zeolite contains 3% by weight or more transition metal M, and element mapping of the transition metal M in the zeolite determined with an electron probe microanalyzer shows that the coefficient of variation in intensity of the transition metal M is 33% or less. The molar ratio of an aluminum atom to the total of a silicon atom and a phosphorus atom is 0.9 or more. The transition-metal-containing aluminophosphate zeolite finds application as an exhaust gas treatment catalyst and as a water vapor absorbent.