Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (9): 1534-1542.DOI: 10.1016/S1872-2067(18)63082-7

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Pt supported on octahedral Fe3O4 microcrystals as a catalyst for removal of formaldehyde under ambient conditions

Weiyi Cuia,b, Dan Xuec, Naidi Tana, Bin Zhengb, Mingjun Jiab, Wenxiang Zhangb   

  1. a Key Laboratory of Chemical Cleaner Production Technology of Jilin Province, Jilin Institute of Chemical Technology, Jilin 132022, Jilin, China;
    b Key Laboratory of Surface and Interface Chemistry of Jilin Province, College of Chemistry, Jilin University, Changchun 130021, Jilin, China;
    c School of Chemistry﹠Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, Shaanxi, China
  • Received:2018-03-07 Revised:2018-04-23 Online:2018-09-18 Published:2018-07-19
  • Contact: 10.1016/S1872-2067(18)63082-7
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (20973080, 21473074).

Abstract:

Several catalysts comprising Pt supported on octahedral Fe3O4 (Pt/Fe3O4) were prepared by a facile method involving co-precipitation followed by thermal treatment at different temperatures. A variety of characterization results revealed that this preparation process afforded highly crystalline octahedral Fe3O4 with a uniform distribution of Pt nanoparticles on its surface. The thermal-treatment temperature significantly influenced the redox properties of the Pt/Fe3O4 catalysts. All the Pt/Fe3O4 catalysts were found to be catalytically active and stable for the oxidation of low-concentration formaldehyde (HCHO) with oxygen. The catalyst prepared by thermal treatment at 80℃ (labelled Pt/Fe3O4-80) exhibited the highest catalytic activity, efficiently converting HCHO to CO2 and H2O under ambient temperature and moisture conditions. The excellent performance of Pt/Fe3O4-80 was mainly attributed to beneficial interactions between the Pt and Fe species that result in the formation a higher density of active interface sites (e.g., Pt-O-FeOx and Pt-OH-FeOx). The introduction of water vapor improves the catalytic activity of the Pt/Fe3O4 catalysts as it participates in a water-assisted dissociation process.

Key words: Octahedral Fe3O4, Pt nanoparticles, Interfacial interaction, Catalytic oxidation, Formaldehyde