Insights into the underpinning effect of graphene in Cu1Mn10 on enhancing the low-temperature catalytic activity for CO oxidation

Yafang Shen; Jing Sun; Jingwei Li; Yilin Dong; Wenlong Wang; Zhanlong Song; Xiqiang Zhao; Yanpeng Mao

doi:10.1016/j.envres.2023.116981

Insights into the underpinning effect of graphene in Cu₁Mn₁₀ on enhancing the low-temperature catalytic activity for CO oxidation

Environ Res. 2023 Nov 15;237(Pt 2):116981. doi: 10.1016/j.envres.2023.116981. Epub 2023 Aug 26.

Authors

Yafang Shen¹, Jing Sun², Jingwei Li¹, Yilin Dong¹, Wenlong Wang¹, Zhanlong Song¹, Xiqiang Zhao¹, Yanpeng Mao¹

Affiliations

¹ National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China.
² National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China. Electronic address: sunjing0108@163.com.

PMID: 37640095
DOI: 10.1016/j.envres.2023.116981

Abstract

CO emission is a critical issue of industrial processes such as steel-smelting, cement manufacturing, and waste incineration. Catalytic oxidation based on Cu-Mn binary catalysts shows great potential for efficient removal of CO, whereas their practical applicability is limited by the inferior low-temperature catalytic activity and the high catalyst cost owing to a substantial quantity of Cu. In this study, doping graphene is designed to adjust the electron transfer capability to improve the low-temperature catalytic activity as well as reduce the amount of Cu, and thereby Cu₁Mn₁₀ catalysts doped with slight amounts of graphene (x%G-Cu₁Mn₁₀, x is 1∼5) were fabricated. It was found that the introduction of graphene could form effective electron transport channels to enhance the intermetallic interaction and oxygen vacancy generation, thus improving the low-temperature catalytic performance of the Cu₁Mn₁₀ catalyst. Among all the catalysts, 4%G-Cu₁Mn₁₀ exhibited the highest activity, achieving CO conversion of 92% at 110 °C at a weight hourly space velocity of 120,000 mL/(g∙h). The introduction of graphene also enabled the catalyst with excellent catalytic activity and stability at a relative humidity of 70%. Attractively, 4%G-Cu₁Mn₁₀ can be further loaded into the polyester fabric, presenting great application potentials in the effective elimination of CO during the dust removal process since the flue gas temperature in the dust collector is just around the T_90% and the catalyst that is inside of fabric fiber rather than on the fabric surface can be rarely influenced by the dust. In general, doping graphene provides a facile method to enhance the low-temperature activities of the Cu-Mn binary catalysts and cut down the use of valuable Cu, showing great application potential.

Keywords: CO oxidation; Cu–Mn binary catalysts; Graphene; Oxygen vacancies; Polyester fabric.