Highly dispersed platinum in metal organic framework NH 2-MIL- 101(Al) containing phosphotungstic acid - Characterization and catalytic performance

Enrique V. Ramos-Fernandez*, Cyriel Pieters, Bart Van Der Linden, Jana Juan-Alcañiz, Pablo Serra-Crespo, M. W.G.M. Verhoeven, Hans Niemantsverdriet, Jorge Gascon Sabate, Freek Kapteijn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

123 Scopus citations

Abstract

The synthesis, characterization (FT-IR, XPS, NMR, UV-Vis), and catalytic performance of Pt supported on phosphotungstic acid (PTA) encapsulated in a metal organic framework (MOF) are reported. The highly dispersed Keggin units of PTA in NH 2-MIL-101(Al), synthesized in one step, act as anchoring sites for the Pt precursor species. After different post-treatments, the resulting catalysts have been tested in the oxidation of CO, the preferential oxidation of CO in the presence of H 2, and the hydrogenation of toluene. Reduction at 473 K results in the formation of small Pt 0 clusters and Pt 2+ species. Reduction at 573 K induces the formation of intermetallic Pt-W 5+ species, which exhibit the best CO oxidation activity and a higher selectivity toward CO 2 than alumina supported Pt, resembling the combination of a noble metal on a reducible support. In toluene hydrogenation, the MOF catalysts perform worse than Pt on alumina, ascribed to the too small size of the Pt clusters in the MOF catalysts.

Original languageEnglish (US)
Pages (from-to)42-52
Number of pages11
JournalJournal of Catalysis
Volume289
DOIs
StatePublished - May 1 2012

Keywords

  • CO oxidation
  • Metal organic framework
  • NH -MIL-101(Al)
  • PROX
  • Phosphotungstic acid
  • Pt dispersion

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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