Catalyst for cleaning up nitrogen oxides and a method for producing same
View Patent ↗Provided is a silver-supported alumina catalyst for reducing nitrogen oxides using ethanol, which has the drawbacks of the conventional silver-supported alumina catalysts improved, has high performance, is not likely to deteriorate over time, and has excellent initial performance and durability. A catalyst for purifying nitrogen oxides, which purifies nitrogen oxides in exhaust gas using an alcohol as a reducing agent, and contains alumina, aluminum sulfate and silver as main components.
1. A catalyst for purifying nitrogen oxides in exhaust gas using an alcohol as a reducing agent, the catalyst comprising alumina, aluminum sulfate and silver as main components; wherein the catalyst contains 0.5% to 5% by weight of silver and 1% to 4% by weight of aluminum sulfate based on alumina.
2. The catalyst of claim 1 , wherein the catalyst contains 1% to 2% by weight of silver.
3. The catalyst of claim 1 , wherein the weight ratio of aluminum sulfate to silver is from 1 to 2.
4. The catalyst of claim 1 , wherein the catalyst consists of alumina, aluminum sulfate, and silver.
5. The method for producing the catalyst according to claim 1 , comprising impregnating alumina with a silver salt solution, subsequently calcining the impregnated alumina to obtain a silver-supported alumina catalyst, and supporting aluminum sulfate on the silver-supported alumina catalyst.
6. The method for producing the catalyst according to claim 5 , wherein the catalyst contains 1% to 2% by weight of silver.
7. The method for producing the catalyst according to claim 5 , wherein the weight ratio of aluminum sulfate to silver is from 1 to 2.
8. The method of claim 5 , wherein the catalyst consists of alumina, aluminum sulfate, and silver.
9. The method for producing the catalyst according to claim 5 , wherein the silver salt is an aqueous solution of silver nitrate, silver chloride, or silver sulfate.
10. The method for producing the catalyst according to claim 9 , wherein the silver salt is an aqueous solution of silver nitrate.
11. The method for producing the catalyst according to claim 9 , wherein the silver salt is an aqueous solution of silver chloride.
12. The method for producing the catalyst according to claim 9 , wherein the silver salt is an aqueous solution of silver sulfate.