Physicochemical Characterization of Highly Dispersed Platinum and Chromium on Zeolite Beta

DOI Web Site 被引用文献1件
  • Yoshiyuki Izutsu
    Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Yuki Oku
    Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Yusuke Hidaka
    Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Naoki Kanaya
    Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Yoshiki Nakajima
    Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Jun Fukuroi
    Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Kaname Yoshida
    Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta, Nagoya, Aichi 456-8587, Japan
  • Yukichi Sasaki
    Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta, Nagoya, Aichi 456-8587, Japan
  • Yasushi Sekine
    Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Masahiko Matsukata
    Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan

説明

Structures of platinum and chromium supported on zeolite beta were investigated by XAFS, XPS, UV–vis, NH3-TPD, XRD, CO chemisorption, and molecular dynamics simulation. Both platinum and chromium were uniformly dispersed in the micropore of zeolite beta. Loading of chromium helped platinum to disperse highly and stabilized in the micropore of beta. Major species of platinum on PtCr/beta after calcination at 773 K was Pt2+ forming a Pt–O bond. The Pt–O bond disappeared, and a Pt–Pt bond did not appear by reducing PtCr/beta in hydrogen, accompanying formation of Pt0. Chromium was loaded as chromate anion in the micropore of zeolite. Results of molecular dynamics simulation showed that Pt2+ associated with CrO42– in the micropore of zeolite beta was more stable than those in the absence of chromium species. We concluded that CrO42– electrostatically stabilizes Pt2+ and inhibits migration and aggregation of platinum.

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