Highly dispersive Au nanoparticles on TiO2 nanofibers as a supported catalyst synthesized from Al-Ti-Au intermetallic compound

Yi Xin Liu, Satoshi Ohhashi, Satoshi Kameoka, An Pang Tsai

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    In the present study, we highly dispersed the Gold nanoparticles onto TiO2 nanofibers from leached Al-Ti-Au intermetallic compounds (IMCs) as a catalyst. The IMCs have an ordered structure, which could let the substitutional Au atoms neighboring to Ti atoms in IMC structure. The Al-based IMC single phase was proposed to obtain a high specific area and highly dispersive Au nanoparticles instead of the solid solution after leaching. Therefore, single phase L12-Al67Ti25Au8 was prepared and homogenized by arc-melting and conducted annealing. The ingot of L12-Al67Ti25Au8 was crushed and gathered under 25 µm as precursors. The leaching processes were using the aq. NaOH and aq. HCl. The removal Al of the precursors achieved 95%, and exhibits the special urchin-like particles with TiOx nanofibers. The urchin-like morphology provided a high surface area. After heat treatment, the TiOx transformed to the anatase TiO2 at 500 °C for 2 h under the air or CO/O2/He. The TEM images showed lots of Gold nanoparticles dispersing homogeneously onto the TiOx nanofibers. The CO conversion efficiency of Au/TiO2 was 50% at 50 °C without heat-treatment. Although the contribution mainly attributed to Au nanoparticles, Au/TiO2 exhibited significantly higher catalytic activity than Au/TiOx composite. The CO oxidation activity Au/TiO2 could reach up to 98% when as lower as 50 °C.

    Original languageEnglish
    Article number115249
    JournalChemical Engineering Science
    Volume211
    DOIs
    Publication statusPublished - 2020 Jan 16

    Keywords

    • Au/TiO
    • Catalysis
    • Intermetallic compound
    • L1 phase
    • Leaching

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Industrial and Manufacturing Engineering

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