Zhang Ping, Wang Le-fu, Xu Jian-chang
Department of Environmental Science, Guangzhou University, Guangzhou, Department of Chemical Engineering, South China University of Technology, Guangzhou 510630, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2003 Feb;23(1):46-8.
An in situ diffuse reflectance FTIR spectroscopy (DRIFTS) study of the selective catalytic reduction (SCR) of NO with propene in the presence of excess O2 was carried out over Ag/SAPO-34 catalyst. The SCR reaction was investigated at temperatures from 573 to 773 K, and the role of oxygen in the NO reduction process was determined by comparing experiments using an initial reaction mixture containing oxygen and without oxygen. The results show that both NO and propene are easily activated in oxygen. Furthermore, the presence of oxygen is necessary to form organo-NOx adsorbed species. Based on these experiments, a reaction mechanism is proposed that NO, propene and oxygen react to form organo-nitro and organo-nitrito adsorbed species as key intermediates, and then these intermediates decompose to nitrogen.
在Ag/SAPO - 34催化剂上，利用原位漫反射傅里叶变换红外光谱（DRIFTS）研究了在过量O₂存在下丙烯选择性催化还原（SCR）NO的反应。在573至773 K的温度范围内对SCR反应进行了研究，并通过比较使用含氧气和不含氧气的初始反应混合物的实验，确定了氧气在NO还原过程中的作用。结果表明，NO和丙烯在氧气中都易于被活化。此外，氧气的存在对于形成有机 - NOₓ吸附物种是必要的。基于这些实验，提出了一种反应机理，即NO、丙烯和氧气反应形成有机硝基和有机亚硝酸根吸附物种作为关键中间体，然后这些中间体分解为氮气。
