Di- and Tetrameric Molybdenum Sulfide Clusters Activate and Stabilize Dihydrogen as Hydrides

Rachit Khare, Roland Weindl, Andreas Jentys, Karsten Reuter, Hui Shi, Johannes A. Lercher

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

NaY zeolite-encapsulated dimeric (Mo2S4) and tetrameric (Mo4S4) molybdenum sulfide clusters stabilize hydrogen as hydride binding to Mo atoms. Density functional theory (DFT) calculations and adsorption measurements suggest that stabilization of hydrogen as sulfhydryl (SH) groups, as typical for layered MoS2, is thermodynamically disfavored. Competitive adsorption of H2and ethene on Mo was probed by quantifying adsorbed CO on partly hydrogen and/or ethene covered samples with IR spectroscopy. During hydrogenation, experiment and theory suggest that Mo is covered predominately with ethene and sparsely with hydride. DFT calculations further predict that, under reaction conditions, each MoxSycluster can activate only one H2, suggesting that the entire cluster (irrespective of its nuclearity) acts as one active site for hydrogenation. The nearly identical turnover frequencies (24.7 ± 3.3 molethane·h-1·molcluster-1), apparent activation energies (31-32 kJ·mol-1), and reaction orders (∼0.5 in ethene and ∼1.0 in H2) show that the active sites in both clusters are catalytically indistinguishable.

Original languageEnglish
Pages (from-to)613-622
Number of pages10
JournalJACS Au
Volume2
Issue number3
DOIs
StatePublished - 28 Mar 2022

Keywords

  • IR spectroscopy
  • Molybdenum sulfide clusters
  • density functional theory
  • hydride
  • hydrogen activation

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