Characteristics of catalytic destruction of dichloromethane and ethyl acetate mixture over H_(x)PO_(4)-RuO_(x)/CeO_(2) catalyst  

作　　者：Jiawen Chen Qingjie Meng Feng Bi Jingkun Chen Xiaole Weng Zhongbiao Wu 

机构地区：[1]Key Laboratory of Environment Remediation and Ecological Health,Ministry of Education,College of Environmental and Resource Sciences,Zhejiang University,Hangzhou 310058,China [2]School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo 315211,China [3]ZJU-Hangzhou Global Scientific and Technological Innovation Center,Hangzhou 311200,China [4]Zhejiang Provincial Engineering Research Centre of Industrial Boiler&Furnace Flue Gas Pollution Control,Hangzhou 310058,China

出　　处：《Journal of Environmental Sciences》2025年第2期336-349,共14页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China (Nos.21906087 and 52070168);the Key R&D Plan of Zhejiang Province (No.2023C03127);the Fundamental Research Funds for the Central Universities (No.226-2022-00150).

摘　　要：Catalytic destruction is an ascendant technology for the abatement of volatile organic compounds(VOCs)originating fromsolvent-based industrial processes.The varied composition tends to influence each VOC’s catalytic behavior in the reaction mixture.We investigated the catalytic destruction of multi-component VOCs including dichloromethane(DCM)and ethyl acetate(EA),as representatives from pharmaceutical waste gases,over co-supported HxPO_(4)-RuOx/CeO_(2) catalyst.A mutual inhibitory effect relating to concentrations because of competitive adsorption was verified in the binary VOCs oxidation and EA posed a more negative effect on DCM oxidation owing to EA’s superior adsorption capacity.Preferential adsorption of EA on acidic sites(HxPO_(4)/CeO_(2))promoted DCM activation on basic sites(O^(2−))and the dominating EA oxidation blocked DCM’s access to oxidation centers(RuOx/CeO_(2)),resulting in boosted monochloromethane yield and increased chlorine deposition for DCM oxidation.The impaired redox ability of Ru species owing to chlorine deposition in turn jeopardized deep oxidation of EA and its by-products,leading to increased gaseous by-products such as acetic acid originating fromEA pyrolysis.Notably,DCM at low concentration slightly promoted EA conversion at low temperatures with or without water,consistent with the enhanced EA adsorption in co-adsorption analyses.This was mainly due to that DCM impeded the shielding effect of hydrolysate deposition from rapid EA hydrolysis depending on the decreased acidity.Moreover,water benefited EA hydrolysis but decreased CO_(2) selectivity while the generated water derived from EA was likely to affect DCM transformation.This work may provide theoretical guidance for the promotion of applied catalysts toward industrial applications.

关 键 词：Catalytic destruction Multi-component VOCs Mixture effect Interaction mechanism 

分 类 号：O64[理学—物理化学]