Tosoh Corporation

Satoshi Nakamura

Hidekazu Aoyama

Seiji Maehama

Yusuke Naraki

Ko Ariga

Keita Nakao

A CHA-type zeolite has a molar ratio of silica to alumina of 10.0 or more and less than 20.0 and a molar ratio of silanol groups to silicon of 0.15&#xd7;10or more and 0.50&#xd7;10or less, a molar ratio of silica to alumina of 20.0 or more and 35.0 or less and a molar ratio of silanol groups to silicon of 0.15&#xd7;10or more and 1.10&#xd7;10or less, a molar ratio of silica to alumina of more than 35.0 and 45.0 or less and a molar ratio of silanol groups to silicon of 0.15&#xd7;10or more and 1.65&#xd7;10or less, or a molar ratio of silica to alumina of more than 45.0 and 55.0 or less and a molar ratio of silanol groups to silicon of 0.15&#xd7;10or more and 1.80&#xd7;10or less.

CHA-type zeolite and method for producing the same

Provided is a metal-containing CHA-type zeolite in which a ratio of a maximum intensity of an absorption peak in a range of 3685 cmor more and 3750 cmor less to a maximum intensity of an absorption peak in a range of 1800 cmor more and 1930 cmor less is less than 1.5 in an IR spectrum. A method for producing the metal-containing CHA-type zeolite includes a metal incorporation step of mixing a metal source and a CHA-type zeolite in which a ratio of a maximum intensity of an absorption peak in a range of 3665 cmor more and 3750 cmor less to a maximum intensity of an absorption peak in a range of 1800 cmor more and 1930 cmor less is less than 1.5 in an IR spectrum.

Metal-containing cha-type zeolite and method for producing the same

A process of manufacturing a chabazite-type zeolite is provided having high heat resistance without having a large crystal size. A catalyst is also provided that contains such a chabazite-type zeolite and exhibits high nitrogen oxide reduction properties, and in particular high nitrogen oxide reduction properties in low temperatures below 200&#xb0; C., even after exposure to high temperature and high humidity. A chabazite-type zeolite is provided having a silica to alumina molar ratio of no less than 15, a silanol group to silicon molar ratio of no more than 1.6&#xd7;10, an average crystal size of 0.5 &#x3bc;m to less than 1.5 &#x3bc;m, and a ratio of 50%-volume particle size to 10%-volume particle size of no more than 3.2. The chabazite-type zeolite preferably contains at least one of copper and iron.

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Yamaguchi, Japan

Satoshi Nakamura