N/Ce doped graphene supported Pt nanoparticles for the catalytic oxidation of formaldehyde at room temperature
Jingbo Jia , Yaodong Guo , Zhaoying Di , Xiaonan Guo , Ying Wei , Runduo Zhang
DOI:10.1016/j.jes.2021.12.033
Received September 27, 2021,Revised , Accepted December 24, 2021, Available online January 05, 2022
Volume 35,2023,Pages 135-147
Pt catalysts with nitrogen-doped graphene oxide (GO) as support and CeO2 as promoter were prepared by impregnation method, and their catalytic oxidation of formaldehyde (HCHO) at room temperature was tested. The Pt-CeO2/N-rGO (reduced GO) with a mass fraction of 0.7% Pt and 0.8% CeO2 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 CeO2 and Pt was also beneficial to the dispersion of Pt. Nitrogen-doping promoted the production of more Ce3+ ions, generating more oxygen vacancies, which was conducive to O2 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.
