能源环境保护2025，Vol.39Issue(4)：14-25,12.DOI:10.20078/j.eep.20250301
贵金属负载催化剂用于CO氧化研究进展
Research Progress on CO Oxidation with Supported Noble Metal Catalysts
摘要
Abstract
The excessive emission of carbon monoxide(CO)from steel sintering flue gas poses a significant threat to regional air quality and human health.This necessitates the development of effective CO treatment technologies for sintering flue gas.Among these,catalytic oxidation technology has emerged as a stable and efficient method for CO removal.Noble metal-loaded catalysts,including those based on platinum(Pt),palladium(Pd),gold(Au),ruthenium(Ru),and iridium(Ir),are considered to have significant application potential due to their excellent low-temperature oxidation performance and resistance to water and sulfur.However,challenges arise from the scarcity and high cost of noble metals,as well as the complex composition of flue gases.These factors complicate the application of noble metal-loaded catalysts in industrial settings,highlighting the importance of research focused on CO oxidation.The activity of noble catalysts is primarily influenced by their physicochemical properties,including morphology,particle size,elemental doping,support type,oxygen vacancies,and surface hydroxyl groups.It has been observed that a moderate amount of H2O can enhance CO oxidation on these catalysts,while excessive H2O can inhibit the reaction due to competitive adsorption effects.Additionally,the presence of SO2 in the flue gas can lead to its adsorption on noble metal active sites or the support,further diminishing the adsorption efficiency of CO and O2 and causing carrier sulfation.The CO oxidation reaction on noble metal-loaded catalysts is governed by three mechanisms:Langmuir-Hinshelwood(L-H),Mars-van Krevelen(MvK),and Eley-Rideal(ER).H2O plays a dual role in these pathways,enhancing CO catalytic oxidation in some cases while inhibiting it in others.However,the presence of SO2 typically reduces the adsorption performance of CO and O2,which can lead to decreased catalyst activity or even deactivation.Given the emission characteristics of sintering flue gas,future research on noble metal-supported catalysts should focus on three aspects.(1)Improving stability and anti-poisoning performance:Even after desulfurization,sintering flue gas contains residual SO2,necessitating catalysts that can withstand such conditions;(2)Investigating activity in complex pollutant environments:Research should explore the activity of noble metal-based catalysts in the presence of various pollutants,including SO2,heavy metals,alkali metal dust,and chlorine-containing VOCs;(3)Reducing noble metal loading:Given the high flow rates of sintering flue gas,it is crucial to develop strategies that minimize noble metal usage while maintaining effective CO treatment.This paper aims to provide guidance for the development and optimization design of CO noble metal supported catalysts for sintering flue gas.关键词
CO净化/贵金属/催化氧化/反应机理/烧结烟气Key words
CO purification/Noble metals/Catalytic oxidation/Reaction mechanism/Sintering flue gas分类
资源环境引用本文复制引用
邹洋,刘霄龙,朱廷钰..贵金属负载催化剂用于CO氧化研究进展[J].能源环境保护,2025,39(4):14-25,12.基金项目
国家自然科学基金资助项目(52170118) （52170118）
