发明名称 |
SCR CATALYSTS HAVING IMPROVED LOW TEMPERATURE PERFORMANCE, AND METHODS OF MAKING AND USING THE SAME |
摘要 |
SCR-active molecular sieve based-catalysts are produced by combining a molecular sieve with at least one ionic iron species and at least one organic compound to form a mixture, then calcining the mixture to remove the at least one organic compound. This process improves the dispersion of the iron within the molecular sieve compared to an iron-containing molecular sieve that is not treated with an organic compound. Iron-containing ferrierite zeolites exhibit a selective catalytic reduction of nitrogen oxides with NH3 or urea of greater than 25% conversion at 300° C. in exhaust gases prior to ageing or exposure to steam. Iron-containing beta zeolites exhibit a selective catalytic reduction of nitrogen oxides with NH3 or urea of: (a) greater than 40% conversion at 300° C. and (b) greater than 80% conversion at 400° C., in exhaust gases after ageing for 20 hours at 700° C. in the presence of 10% H2O. |
申请公布号 |
US2015246345(A1) |
申请公布日期 |
2015.09.03 |
申请号 |
US201514633658 |
申请日期 |
2015.02.27 |
申请人 |
JOHNSON MATTHEY PUBLIC LIMITED COMPANY |
发明人 |
COLLIER Jillian Elaine;DURAN-MARTIN Desiree;RAJARAM Raj Rao |
分类号 |
B01J29/072;C01B39/44;B01J29/76;C01B39/02;B01J29/85;B01J29/68 |
主分类号 |
B01J29/072 |
代理机构 |
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代理人 |
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主权项 |
1. A process for producing an SCR-active molecular sieve based-catalyst,
comprising: combining a molecular sieve with at least one ionic iron species and at least one organic compound to form a mixture; and removing the at least one organic compound by calcining the mixture. |
地址 |
LONDON GB |