Ag/Al_2O_3催化剂催化含氧烃类选择性还原氮氧化物的基础与应用研究进展  

Advances in Mechanistic and Practical Studies on the Selective Catalytic Reduction of NOx by Oxygenated Hydrocarbons over Ag/Al_2O_3

作　　者：贺泓[1] 余运波[1] 李毅[1] 吴强[1] 张秀丽[1] 张长斌[1] 石晓燕[1] 宋小萍[1] 

机构地区：[1]中国科学院生态环境研究中心环境化学与生态毒理学国家重点实验室,北京100085

出　　处：《催化学报》2010年第5期491-501,共11页

基　　金：国家自然科学基金(20773158;10735090);国家高技术研究发展计划(863计划;2009AA064802;2006AA06A304)

摘　　要：Ag/Al2O3催化含氧烃类选择性还原(SCR)氮氧化物(NOx)是有望实际应用于柴油机尾气治理的技术之一.从Ag/Al2O3的基本属性、还原剂的筛选与匹配、NOx还原低温活性改进、催化体系耐硫性的调变和Ag/Al2O3-乙醇体系的实用化开拓等方面,对我们近年来的工作进行了综述,阐明了该组合体系高效SCR特性的微观机制.发动机台架实验表明,结合柴油机机内调整,应用Ag/Al2O3-乙醇的SCR体系能够满足我国重型柴油车国Ⅳ排放标准.The selective catalytic reduction（SCR） of NOx by oxygenated hydrocarbons over Ag/Al2O3 is a promising candidate for NOx removal from diesel engine exhausts.Ag/Al2O3-ethanol as a catalyst-reductant system with high performance for NOx reduction was set up based on the characterization of basic properties of Ag/Al2O3,optimization of reductants,improvement of low-temperature activity,and tuning of SO2 tolerance.Furthermore,a mechanism of NOx reduction was proposed,which can explain the high efficiency of the Ag/Al2O3-ethanol system for NOx reduction.The Ag/Al2O3 washcoated honeycomb catalyst and catalytic converter were designed and prepared.Diesel engine bench tests showed that the Ag/Al2O3-ethanol NOx catalytic converter can satisfy the NOx emission requirements of the China Ⅳ standard for heavy duty diesel when combined with the adjustment of diesel engines.

关 键 词：银 氧化铝 氮氧化物 选择性催化还原 催化转化器 台架实验 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]