Molecular rhodium complexes supported on the metal-oxide-like nodes of metal organic frameworks and on zeolite HY: Catalysts for ethylene hydrogenation and dimerization

Varinia Bernales, Dong Yang, Jun Yu, Gamze Gümüşlu, Chris Cramer, Bruce C. Gates, Laura Gagliardi

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Metal-organic frameworks (MOFs) with nodes consisting of zirconium oxide clusters (Zr6) offer new opportunities as supports for catalysts with well-defined, essentially molecular, structures. We used the precursor Rh(C2H4)2(acac) (acac is acetylacetonate) to anchor Rh(I) complexes to the nodes of the MOF UiO-67 and, for comparison, to the zeolite dealuminated HY (DAY). These were characterized experimentally by measurement of catalytic activities and selectivities for ethylene hydrogenation and dimerization in a once-through flow reactor at 298 K and 1 bar. The catalyst performance data are complemented with structural information determined by infrared and extended X-ray absorption fine structure spectroscopies and by calculations at the level of density functional theory, the latter carried out also to extend the investigation to a related MOF, NU-1000. The agreement between the experimental and calculated structural metrics is good, and the calculations have led to predictions of reaction mechanisms and associated energetics. The data demonstrate a correlation between the catalytic activity and selectivity and the electron-donor tendency of the supported rhodium (as measured by the frequencies of CO ligands bonded as probes to the Rh(I) centers), which is itself a measure of the electron-donor tendency of the support.

Original languageEnglish (US)
Pages (from-to)33511-33520
Number of pages10
JournalACS Applied Materials and Interfaces
Volume9
Issue number39
DOIs
StatePublished - Oct 4 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

Keywords

  • Density functional theory
  • Ethylene dimerization
  • Ethylene hydrogenation
  • Metal-organic framework nodes
  • Rhodium complexes
  • Supported catalyst

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