CATALISADOR PARA REDUZIR AS EMISSÕES DE NOX DE UMA CORRENTE DE GÁS DE ESCAPE DE UM MOTOR DE QUEIMA POBRE, SISTEMA DE TRATAMENTO DE EMISSÕES PARA UMA CORRENTE DE ESCAPE, E, MÉTODO PARA PREPARAR UM CATALISADOR.

摘要

Catalysts, systems and methods are described to reduce NOx emissions of an internal combustion engine. In one embodiment, an emissions treatment system for an exhaust stream is provided having a catalyst comprising silver on a particulate alumina support, the silver having a diameter of less than about 20 nm. Methods of manufacturing catalysts are described in which ionic silver is impregnated on particulate hydroxylated alumina particles.