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In Situ Formation of Pt–Au Nanoparticles on Magnetic Composites Carriers: Tuning Catalytic Activity by Incorporation of Different Metal Oxides
Author(s) -
Zhang Zewu,
Wu Qiong,
Bu Xiaohai,
Hang Zusheng,
Wang Zhangzhong,
Wang Qikang,
Ma Yuhang
Publication year - 2018
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.11347
Subject(s) - bimetal , nanomaterial based catalyst , catalysis , nanoparticle , materials science , metal , calcination , chemical engineering , x ray photoelectron spectroscopy , selective catalytic reduction , nanocomposite , adsorption , nanotechnology , chemistry , composite material , metallurgy , organic chemistry , engineering
Supported Pt─Au bimetal nanocatalysts have been prepared by an in situ reduction method followed by calcination in air and reduction in H 2 atmosphere. The catalysts exhibit a typical yolk‐shell construction composed of a moveable magnetic Fe core and metal oxides shells decorated with Pt─Au nanoparticles. The structure of the bimetal nanocatalysts was characterized in detail by TEM, XRD, XPS, and N 2 physical adsorption and the catalytic activity of the nanocatalysts was studied by the catalytic reduction of 4‐nitrophenol to 4‐nitrophenol. It is found that the bimetal nanocatalysts composed with the different metallic oxides (TiO 2 and ZrO 2 ) exhibited the comparable Pt─Au particles size (~10 nm). However, the content of Pt─Au nanoparticles was varied with the metallic oxides support. Pt─Au nanoparticles deposited uniformly on TiO 2 with higher loadings, however the nanoparticles on ZrO 2 exhibited remarkably lower content, which should be attributed to the abundant hydroxyl on TiO 2 surface that served as the deposition site for Pt─Au nanoparticles. The result of the reduction reaction indicated that incorporation of TiO 2 in the bimetal Pt─Au nanocatalyst could significantly improve the catalytic activity as compared with ZrO 2 and m‐SiO 2 . A possible mechanism was proposed to explain the synergistic effect in the supported Pt─Au bimetal nanocatalysts.