METHOD FOR PRODUCING TRANSITION-METAL-CONTAINING ZEOLITE, TRANSITION METAL ZEOLITE PRODUCED BY THE METHOD, AND EXHAUST GAS PURIFICATION CATALYST INCLUDING THE ZEOLITE

摘要

Provided is a method for producing a transition-metal-containing silicoaluminophosphate that is highly suitable as a catalyst or an adsorbent and has excellent high-temperature hydrothermal durability and excellent water resistance, that is, excellent durability against water submersion (water-submersion durability), in a simple and efficient manner. A method for producing a transition-metal-containing zeolite, the method comprising a steam treatment step in which a transition-metal-containing zeolite is stirred at 710° C. or more and 890° C. or less in the presence of water vapor, the transition-metal-containing zeolite containing a transition metal in a zeolite having a framework structure including silicon atoms, phosphorus atoms, and aluminium atoms.