| abstract |
A selective catalytic reduction (SCR) catalyst composition effective in reducing nitrogen oxides (NO x) is provided. The SCR catalyst composition significantly increases the NO x conversion compared to the Cu-chabazite reference catalyst composition at any temperature, particularly at low temperatures. Also provided are catalytic articles, exhaust gas treatment systems, and methods of treating exhaust gas streams each comprising the SCR catalyst composition of the present invention. The SCR catalyst composition is particularly useful for treating exhaust from lean combustion engines. |