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Hydroxyapatite-supported palladium(0) nanoclusters as effective and reusable catalyst for hydrogen generation from the hydrolysis of ammonia-borane
Date
2011-06-01
Author
Rakap, Murat
Özkar, Saim
Metadata
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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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.
Subject Keywords
Hydrogen generation
,
Hydrolysis
,
Ammonia-borane
,
Nanoclusters
,
Palladium
,
Hydroxyapatite
URI
https://hdl.handle.net/11511/62523
Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
DOI
https://doi.org/10.1016/j.ijhydene.2011.03.017
Collections
Department of Chemistry, Article