Volcano-curves for dehydrogenation of 2-propanol and hydrogenation of nitrobenzene by SiO 2-supported metal nanoparticles catalysts as described in terms of a d-band model

Masazumi Tamura, Kenichi Kon, Atsushi Satsuma, Ken Ichi Shimizu

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

To confirm whether the activity trends in multistep organic reactions can be understood in terms of the Hammer-Nørskov d-band model in combination with the linear energy relations, we studied correlations between the reaction rates for dehydrogenation and hydrogenation reactions and the position of the d-band center (ε d) relative to the Fermi energy (E F), the ε d - E F value, of various metal catalysts. SiO 2-supported metal (M = Ag, Cu, Pt, Ir, Pd, Rh, Ru, Ni, and Co) catalysts with the same metal loading (5 wt %) and similar metal particle size (8.9-11.7 nm) were prepared. The dehydrogenation of adsorbed 2-propanol in a flow of He and the hydrogenation of adsorbed nitrobenzene in a flow of H 2 were tested as model reactions of organic reactions on the metal surface. As a test reaction of H 2 dissociation on the surface, SiOH/SiOD exchange on the M/SiO 2 catalysts in a flow of D 2 is carried out. The liquid phase hydrogenation of nitrobenzene under 3.0 MPa of H 2 is adopted as an organic reaction under realistic conditions. Generally, the activities show volcano-type dependences on the ε d - E F value, indicating that the ε d - E F value is useful as a qualitative activity descriptor in heterogeneous catalysis of metal nanoparticles for multistep organic reactions.

Original languageEnglish
Pages (from-to)1904-1909
Number of pages6
JournalACS Catalysis
Volume2
Issue number9
DOIs
Publication statusPublished - 2012 Sep 7

Keywords

  • d-band center
  • transition metals
  • trend in catalytic activity

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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