Site-dependent activity of atomic Ti catalysts in Al-based hydrogen storage materials

Abdullah Al-Mahboob, Erik Muller, Altaf Karim, James T. Muckerman, Cristian V. Ciobanu, Peter Sutter

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Doping catalytically inactive materials with dispersed atoms of an active species is a promising route toward realizing ultradilute binary catalyst systems. Beyond catalysis, strategically placed metal atoms can accelerate a wide range of solid-state reactions, particularly in hydrogen storage processes. Here we analyze the role of atomic Ti catalysts in the hydrogenation of Al-based hydrogen storage materials. We show that Ti atoms near the Al surface activate gas-phase H 2, a key step toward hydrogenation. By controlling the placement of Ti, we have found that the overall reaction, comprising H 2 dissociation and H spillover onto the Al surface, is governed by a pronounced trade-off between lowering of the H 2 dissociation barrier and trapping of the products near the active site, with a sharp maximum in the overall activity for Ti in the subsurface layer. Our findings demonstrate the importance of controlling the placement of the active species in optimizing the activity of dilute binary systems.

Original languageEnglish
Pages (from-to)10381-10384
Number of pages4
JournalJournal of the American Chemical Society
Issue number25
Publication statusPublished - Jun 27 2012

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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