Characterization and performance of a [PtMo6]/MgO catalyst for alkane- to-alkene conversion

D. I. Kondarides, K. Tomishige, Y. Nagasawa, U. Lee, Y. Iwasawa

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

A novel [PtMo6]/MgO ensemble catalyst was prepared by using an inorganic cluster [PtMo6O24]8- as precursor and characterized by X-ray absorption fine structure (XAFS) spectroscopy. The EXAFS analysis revealed that platinum and molybdenum atoms interact with MgO support after calcination at temperatures above 673 K, making Pt-O, Pt-Mg and Pt-O (long) bonds, and Mo-O and Mo-Mg bonds, respectively. It was suggested that Pt4+ ions replaced Mg2+ ions of the top layer of the MgO surface, while Mo6+ ions located on the surface in a distorted octahedral symmetry. The dehydrogenation activity of the [PtMo6]/MgO catalyst for the dehydrogenation reactions of butane, isobutane and propane was much higher compared to those of conventionally prepared bimetallic (Pt-Mo/MgO) and monometallic (Pt/MgO and Mo/MgO) catalysts. The selectivity to the corresponding alkenes was typically above 97%. The [PtMo6]/MgO ensemble catalyst was found to be resistant to deactivation due to coke formation.

Original languageEnglish
Pages (from-to)145-165
Number of pages21
JournalJournal of Molecular Catalysis A: Chemical
Volume111
Issue number1-2
DOIs
Publication statusPublished - 1996 Sep 10
Externally publishedYes

Keywords

  • Alkanes
  • Characterization
  • Dehydrogenation
  • Magnesium
  • Molybdenum
  • Platinum

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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