Zeolite having specific ratio of divalent copper ions supported thereon, and preparation method therefor and catalyst composition comprising same
The present invention relates to zeolite containing Cu2+ (α) and Cu2+ (β) having different NO adsorption capacities loaded at a specific ratio, wherein the zeolite is chabazite (CHA)-type zeolite, particularly chabazite (CHA)-type zeolite loaded with divalent copper ions in which the NO adsorption area ratio of Cu2+ (α)/Cu2+ (β) after exposure to NO (nitrogen oxide) for 180 sec is 80% or more. In addition, the present invention relates to a method of preparing zeolite that is ion-exchanged in a slurry state and to a catalyst including the specified chabazite (CHA)-type zeolite.
1. An SCR catalyst composition, comprising a chabazite (CHA)-type zeolite and a binder, wherein the chabazite (CHA)-type zeolite is loaded with copper ions in which a NO adsorption area of Cu 2+ (α) is 80% or more as compared to a NO adsorption area of Cu 2+ (β) after exposure to NO for 180 sec in a NO DRIFTS spectrum.
2. The catalyst composition of claim 1 , wherein the binder is zirconium acetate.
3. The catalyst composition of claim 1 , further comprising an alkali metal and/or an alkaline earth metal.
4. The catalyst composition of claim 3 , wherein the alkali metal is potassium and the alkaline earth metal is calcium.
5. A honeycomb SCR catalyst structure coated with the catalyst composition of claim 1 .
6. A method of preparing the SCR catalyst composition of claim 1 , the method comprising preparing a zeolite slurry by dispersing a copper precursor and chabazite (CHA)-type zeolite in a slurry state and drying and calcining the zeolite slurry.
7. The method of claim 6 , wherein the copper precursor is copper oxide, copper nitrate, copper sulfate, or copper acetate.