Abstract: This transition metal-loaded zeolite is configured such that an absorption intensity ratio in a specific region of the transition metal-loaded zeolite observed by ultraviolet-visible-near infrared spectroscopy (UV-Vis-NIR) and an intensity ratio of a maximum peak in a different temperature range of the transition metal-loaded zeolite measured by ammonia temperature-programmed desorption, respectively fall within specific ranges.

Abstract: To provide methods for efficiently producing an 8-membered oxygen ring zeolite and an AEI-type zeolite at a low cost, with an organic structure-directing agent that is inexpensive and easily available industrially without using an expensive organic structure-directing agent, such as a cyclic quaternary ammonium salt.

Abstract: 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.

Abstract: Disclosed herein is a copper-supported zeolite containing a zeolite having a framework structure including silicon atoms, phosphorus atoms, and aluminum atoms, and copper supported on the zeolite, wherein the copper-supported zeolite satisfies (1) to (3): (1) an amount of copper (in terms of copper atoms) supported on the copper-supported zeolite is 1.5% by weight or more and 3.5% by weight or less, (2) the copper-supported zeolite has an UV-Vis-NIR absorption intensity ratio of less than 0.35 as determined by a formula (I) below: Intensity (22,000 cm?1)/Intensity (12,500 cm?1) . . . (I), and (3) a silicon atom content of the copper-supported zeolite satisfies a formula (II) below: 0.07?x?0.11 . . . . (II) where x represents a ratio of the number of moles of the silicon atoms to the total number of moles of the silicon atoms, the aluminum atoms, and the phosphorus atoms contained in the framework structure of the copper-supported zeolite.