<p>The present invention relates to a method of reducing coking over a AgZAl<SUB>2</SUB>O<SUB>3</SUB> hydrocarbon selective catalytic reduction catalyst in an exhaust stream of a lean burn internal combustion engine, the exhaust stream comprising hydrocarbon and NOx. The method comprises controlling the hydrocarbon to molar NOx ratio of the exhaust stream so as to be within certain limits at certain temperatures. An exhaust system for a lean burn engine suited to the above method, and a lean burn internal combustion engine, or a vehicle or stationary power source comprising such an exhaust system are also disclosed.</p>
申请公布号
WO2007054740(A1)
申请公布日期
2007.05.18
申请号
WO2006GB50376
申请日期
2006.11.09
申请人
JOHNSON MATTHEY PUBLIC LIMITED COMPANY;RAJARAM, RAJ, RAO;TSOLAKIS, ATHANASIOS;HOUEL, VALERIE, MARIE, RENEE