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Porous TiO2/Pt/TiO2 Sandwich Catalyst for Highly Selective Semihydrogenation of Alkyne to Olefin

  • [设施]:上海光源
  • [期刊/会议名称]:ACS Catalysis
  • [摘要]:The tailoring of metal–oxide interfaces is a powerful approach to enhance the catalytic efficiency of heterogeneous catalysts. However, the function of the metal–oxide interface is still not clearly understood in most catalytic processes. The construction of heterogeneous catalysts with single interface sites would be a straightforward way to reveal the interface effect. In this work, we introduced a simple strategy to synthesize a porous TiO2/Pt/TiO2 sandwich catalyst by atomic layer deposition. All Pt nanoparticles were covered by two porous TiO2 layers in this sandwich structure, creating dominant Pt–TiO2 interface sites. The TiO2/Pt/TiO2 sandwich catalyst shows good catalytic performance in the tandem ammonia–borane decomposition and semihydrogenation of various alkynes with high selectivity and stability. In contrast, the Pt nanoparticles without complete coverage of porous TiO2 layers have a low selectivity in semihydrogenation of alkynes. The sandwich catalyst also exhibits high selectivity in hydrogenation of the −C═O bond of α,β-unsaturated aldehyde. The high selectivity of the TiO2/Pt/TiO2 sandwich catalyst can be ascribed to the electron-rich property of the Pt–TiO2 interface sites, which favor the adsorption of alkyne with electrophilicity but inhibit the overhydrogenation of C═C bonds.
  • [发表日期]:2017
  • [第一作者]:梁浩杰
  • [第一作者单位]:中科院山西煤炭化学研究所
  • [通讯作者]:张斌,覃勇
  • [通讯作者单位]:Porous TiO2/Pt/TiO2 Sandwich Catalyst for Highly Selective Semihydrogenation of Alkyne to Olefin
  • [论文类型]:0
  • [期刊分类]:SCI1区
  • [学科分类]:化学
  • [影响因子]:10.614
  • [关键词]:atomic layer deposition; metal−oxide interface; sandwich structure; semihydrogenation; tandem catalyst
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