Nonselective Reduction of NO by CO under Oxidizing Conditions on Supported Rhodium Sol–Gel Catalysts
Nonselective Reduction of NO by CO under Oxidizing Conditions on Supported Rhodium Sol–Gel Catalysts
复制标题
DOI：
10.1006/jcat.1997.1863
复制
发表时间：
1997-11
影响因子：
7.3
通讯作者：
S. Castillo;M. Morán-pineda;R. Gómez;T. López
中科院分区：
文献类型：
--
作者：
S. Castillo;M. Morán-pineda;R. Gómez;T. López
目前广泛研究的是减少由移动的源形成的氮氧化物以控制大气污染。为了去除汽车尾气中的NO，使用负载型铑催化剂用CO非选择性还原NO是最有前途的技术之一（1）。然而，当前的催化剂不能还原过稀（富O2）排气中的NOx。例如，三元催化转化器在氧化条件下失去其转化一氧化氮的活性，即使还原剂（CO、H2和HC）的浓度超过一氧化氮的浓度（2）。Cho等人（3，4）报道了总的NO+ CO反应涉及以下反应途径：
Currently the reduction of nitrogen oxides formed by mobile sources is widely studied to control atmospheric pollution. To remove the NO from automobile exhaust, the nonselective reduction of NO by CO using supported rhodium catalysts is one of the most promising technologies (1). However, the current catalyst is not able to reduce NOx in excessively lean (O2-rich) exhaust. For instance, the three-way catalytic converter loses its activity in converting nitric oxide in oxidizing conditions, even though the concentration of the reducing agents (CO, H2, and HC) exceeds the concentration of nitric oxide (2). Cho et al.(3, 4), report that the overall NO+ CO reaction involves the following reaction pathways: