A Review on the Impact of SO2on the Oxidation of NO, Hydrocarbons, and CO in Diesel Emission Control Catalysis

Weiwei Yang, Jian Gong, Xiang Wang, Zhenghong Bao, Yanbing Guo, Zili Wu

Research output: Contribution to journalReview articlepeer-review

55 Scopus citations

Abstract

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 CO2and H2O (in the case of HCs) and a proportion of NO to NO2. However, the DOC will unavoidably be poisoned by trace gaseous SO2or 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 SO2effects 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.

Original languageEnglish
Pages (from-to)12446-12468
Number of pages23
JournalACS Catalysis
Volume11
Issue number20
DOIs
StatePublished - Oct 15 2021

Keywords

  • Pt-group metals
  • diesel oxidation catalysts
  • non-noble metal catalysts
  • regeneration
  • sulfur dioxide effect
  • sulfur-resistant materials

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