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US 2020/0047168 A1Published application
Transition metal-carrying zeolite and production method therefor, and nitrogen oxide purification catalyst and method for using same
AssigneeMitsubishi Chemical Corporation
InventorsYuusuke HOTTA, Manabu TANAKA, Takahiko TAKEWAKI, Takeshi MATSUO
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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.
Claims14
A transition metal-loaded zeolite, comprising
- zeolite having a structure designated as AEI or AFX according to a code system defined by International Zeolite Association (IZA), and comprising at least a silicon atom and an aluminum atom in a framework structure thereof, and
- a transition metal M loaded thereon,
- wherein the transition metal-loaded zeolite satisfies (1) and (2):
- (1) a ratio of absorption intensity based on ultraviolet-visible-near infrared spectroscopy (UV-Vis-NIR), which is obtained according to expression (I), is less than 0.4;
- Intensity (32,500 cm−1)/Intensity (12,500 cm−1) (I) and
- (2) a peak intensity obtained according to ammonia temperature-programmed desorption (NH3-TPD) exists in at least each of a range of 200° C. to 400° C. and a range of 450° C. to 600° C. and a ratio of a maximum peak intensity in the range of 200° C. to 400° C. to a maximum peak intensity in the range of 450° C. to 600° C. (NH3-TPD200-400/NH3-TPD450-600) is 1.0 or more and 2.0 or less.
3 more elements
A method for purifying nitrogen oxides, the method comprising:
- bringing the nitrogen oxides into contact with the transition metal-loaded zeolite as a catalyst,
- wherein the transition metal-loaded zeolite comprises zeolite having a structure designated as AEI or AFX according to a code system defined by International Zeolite Association (IZA), and comprising at least a silicon atom and an aluminum atom in a framework structure thereof, and a transition metal M loaded thereon;
- and the transition metal-loaded zeolite satisfies (1) and (2):
- (1) a ratio of absorption intensity based on ultraviolet-visible-near infrared spectroscopy (UV-Vis-NIR), which is obtained according to expression (I), is less than 0.4;
- Intensity (32,500 cm−1)/Intensity (12,500 cm−1) (I), and
- (2) a peak intensity obtained according to ammonia temperature-programmed desorption (NH3-TPD) exists in at least each of a range of 200° C. to 400° C. and a range of 450° C. to 600° C., and a ratio of a maximum peak intensity in the range of 200° C. to 400° C. to a maximum peak intensity in the range of 450° C. to 600° C. (NH3-TPD200-400/NH3-TPD450-600) is 1.0 or more and 2.0 or less.
3 more elements
Dependencies are inferred from the claim text.