Physicochemical characterization of highly dispersed platinum and chromium on zeolite beta

Yoshiyuki Izutsu, Yuki Oku, Yusuke Hidaka, Naoki Kanaya, Yoshiki Nakajima, Jun Fukuroi, Kaname Yoshida, Yukichi Sasaki, Yasushi Sekine, Masahiko Matsukata*

*この研究の対応する著者

研究成果: Article査読

9 被引用数 (Scopus)

抄録

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 CrO 42- electrostatically stabilizes Pt2+ and inhibits migration and aggregation of platinum.

本文言語English
ページ(範囲)10746-10753
ページ数8
ジャーナルJournal of Physical Chemistry C
118
20
DOI
出版ステータスPublished - 2014 5月 22

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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