柴油
硫黄
催化作用
超低硫柴油
柴油颗粒过滤器
化学
贵金属
柴油机排气
氮氧化物
一氧化碳
环境化学
废物管理
化学工程
环境科学
催化氧化
有机化学
工程类
燃烧
作者
Weiwei Yang,Jian Gong,Xiang Wang,Zhenghong Bao,Yanbing Guo,Zili Wu
出处
期刊:ACS Catalysis
日期:2021-09-24
卷期号:11 (20): 12446-12468
被引量:41
标识
DOI:10.1021/acscatal.1c03013
摘要
A high-efficiency after-treatment technology has been required to meet the increasingly stringent regulations on the emissions of nitrogen oxides (NOx), hydrocarbons (HCs), and carbon monoxide (CO) exhausts from diesel engine vehicles throughout the world. The diesel oxidation catalyst (DOC) is an indispensable part of a diesel-fueled exhaust system, which mainly functions in the oxidation of unburned HCs and CO to CO2 and H2O (in the case of HCs) and a proportion of NO to NO2. However, the DOC will unavoidably be poisoned by trace gaseous SO2 or accumulated sulfur on the catalyst under real operational conditions and hence impair the overall purification efficiency of the aftertreatment system. There have been significant research efforts from both academia and industry involving sulfur-relevant diesel oxidation chemistry and development of robust sulfur-resistant oxidation catalysts. This Review focuses on recent advances in the study of SO2 effects on the catalytic oxidation of NO, HCs, and CO over DOCs, with particular attention to the fundamentals beneath apparent observations of sulfur influence on PGM-based and non-noble metal-based catalysts in the different oxidation reactions. Regeneration methods and design rationale for sulfur-resistant catalysts are also covered. Several challenges in the future research regarding microscopic insights into the SO2-influencing mechanism and next-generation sulfur-resistant DOC design are highlighted toward real-world practice.
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