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

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Abstract

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.

Original languageEnglish
Pages (from-to)10746-10753
Number of pages8
JournalJournal of Physical Chemistry C
Volume118
Issue number20
DOIs
Publication statusPublished - 2014 May 22

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Izutsu, Y., Oku, Y., Hidaka, Y., Kanaya, N., Nakajima, Y., Fukuroi, J., Yoshida, K., Sasaki, Y., Sekine, Y., & Matsukata, M. (2014). Physicochemical characterization of highly dispersed platinum and chromium on zeolite beta. Journal of Physical Chemistry C, 118(20), 10746-10753. https://doi.org/10.1021/jp500232s