Guo Yaodong, Di Zhaoying, Guo Xiaonan, Wei Ying, Zhang Runduo, Jia Jingbo
State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Energy Environmental Catalysis, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Energy Environmental Catalysis, Beijing University of Chemical Technology, Beijing 100029, China.
J Environ Sci (China). 2023 Mar;125:135-147. doi: 10.1016/j.jes.2021.12.033. Epub 2022 Jan 5.
Pt catalysts with nitrogen-doped graphene oxide (GO) as support and CeO as promoter were prepared by impregnation method, and their catalytic oxidation of formaldehyde (HCHO) at room temperature was tested. The Pt-CeO/N-rGO (reduced GO) with a mass fraction of 0.7% Pt and 0.8% CeO exhibited an excellent catalytic performance with the 100% conversion of HCHO at room temperature. Physicochemical characterization demonstrated that nitrogen-doping greatly increased the defect degree and the specific surface area of GO, enhanced the dispersion of Pt and promoted more zero-valent Pt. The synergistic effect between CeO and Pt was also beneficial to the dispersion of Pt. Nitrogen-doping promoted the production of more Ce ions, generating more oxygen vacancies, which was conducive to O adsorption. As a result, the catalyst exhibited enhanced redox properties, leading to the best catalytic activity. Finally, an attempt to propose the reaction mechanism of HCHO oxidation has been made.
采用浸渍法制备了以氮掺杂氧化石墨烯（GO）为载体、CeO为助剂的Pt催化剂，并测试了其在室温下对甲醛（HCHO）的催化氧化性能。质量分数为0.7% Pt和0.8% CeO的Pt-CeO/N-rGO（还原氧化石墨烯）在室温下对HCHO的转化率达到100%，表现出优异的催化性能。物理化学表征表明，氮掺杂极大地增加了GO的缺陷程度和比表面积，增强了Pt的分散性并促进了更多零价Pt的生成。CeO与Pt之间的协同效应也有利于Pt的分散。氮掺杂促进了更多Ce离子的产生，产生了更多的氧空位，有利于O的吸附。结果，该催化剂表现出增强的氧化还原性能，从而具有最佳的催化活性。最后，尝试提出了HCHO氧化的反应机理。
