Development and mechanism study of silver cluster catalysts for NOx reduction by urea

提高尿素还原氮氧化物（NOx）的催化活性是去除柴油废气中NO_x的有效方法。研究表明，尿素选择性催化还原NO时，加入H_2可显著提高银氧化铝的催化活性。通过动力学和光谱学研究了反应体系中活性物质的结构和作用机理。通过H_2加成形成的Ag团簇是反应物质。

Improvement of catalytic activity for reduction of nitrogen oxides (NOx) by urea as useful method of NO_x removal from diesel exhausts. This study showed that addition of H_2 in the selective catalytic reduction of NO by urea caused an drastic improvement of catalytic activity of silver-alumina. The mechanism and structure of active species in the present reaction system were studied by kinetic and spectroscopic studies. Ag clusters formed via H_2 addition are shown to be the reactive species.