Hydroxyapatite-supported palladium(0) nanoclusters as effective and reusable catalyst for hydrogen generation from the hydrolysis of ammonia-borane

Rakap M., ÖZKAR S.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol.36, no.12, pp.7019-7027, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 36 Issue: 12
  • Publication Date: 2011
  • Doi Number: 10.1016/j.ijhydene.2011.03.017
  • Journal Name: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.7019-7027
  • Keywords: Hydroxyapatite, Palladium, Nanoclusters, Ammonia-borane, Hydrolysis, Hydrogen generation, SODIUM-BOROHYDRIDE, AQUEOUS-SOLUTION, DEHYDROGENATION, EFFICIENT, DISSOCIATION, OXIDATION, CLEAVAGE, CLUSTERS
  • Middle East Technical University Affiliated: Yes

Abstract

Herein we report the preparation, characterization and catalytic use of hydroxyapatite-supported palladium(0) nanoclusters in the hydrolysis of ammonia-borane. Palladium(0) nanoclusters were formed in situ from the reduction of palladium(II) ion exchanged hydroxyapatite during the hydrolysis of ammonia-borane and supported on hydroxyapatite. The hydroxyapatite-supported palladium(0) nanoclusters are stable enough to be isolated as solid materials and characterized by using a combination of advanced analytical techniques. They are isolable, redispersible and reusable as an active catalyst in the hydrolysis of ammonia-borane even at low concentration and temperature. They provide a maximum hydrogen generation rate of similar to 1425 mL H(2) min(-1) (g Pd)(-1) and 12300 turnovers in the hydrolysis of ammonia-borane at 25 +/- 0.1 degrees C before deactivation. The work reported here also includes the full experimental details for the collection of a wealth of kinetic data to determine the activation energy (E(a) = 54.8 +/- 2.2 kj/mol) and the effect of catalyst concentration on the rate for the catalytic hydrolysis of ammonia-borane. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.