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Indexed by:Journal Papers

Date of Publication:2020-02-15

Journal:APPLIED SURFACE SCIENCE

Included Journals:EI、SCIE

Volume:503

ISSN No.:0169-4332

Key Words:Pt/MnO2@Mn3O4 catalyst; In situ synthesis; Three-phase interface; Strong metal-support interaction; Toluene oxidation

Abstract:Bi-component MnO2 and Mn3O4 supported Pt catalyst (Pt/MnO2@Mn3O4-I) with low Pt loading (0.25 wt%) was synthesized by a facile in situ liquid-phase reduction strategy. The synchronous reduction of segmental MnO2 and Pt precursor by NaBH4 during the preparation process formed a novel interfacial structure in the catalyst. From the results of XRD, HRTEM and XPS, it was found that Pt nanoparticles were highly dispersed on interface of MnO2@Mn3O4 and the unique three-phase interfacial structure of Pt and MnO2@Mn3O4 existed in Pt/MnO2@Mn3O4-I. Meanwhile, the obtained Pt/MnO2@Mn3O4-I catalyst showed excellent catalytic activity for toluene oxidation, which was better than that of single manganese oxide supported Pt catalysts (Pt/MnO2, Pt/Mn3O4), and toluene could be completely oxidized into H2O and CO2 at 160 degrees C under the weight hourly space velocity (WHSV) of 22500 mL g(-1)h(-1). Higher proportions of Pt-o and fine interaction between Pt and MnO2@Mn3O4 at the interface were responsible for the superior catalytic activity and stability of the catalyst. Thus, it was suggested that the in situ fabrication of bi-component manganese oxides supported Pt catalysts with special interfacial structure was a feasible way to enhance toluene catalytic oxidation performances.