Hydroxyapatite-supported cobalt(0) nanoclusters as efficient and cost-effective catalyst for hydrogen generation from the hydrolysis of both sodium borohydride and ammonia-borane

Date

2012-03-20

Author

Rakap, Murat
Özkar, Saim

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

163
views

0
downloads

Herein, we report the preparation, characterization, and catalytic use of cobalt(0) nanoclusters supported on hydroxyapatite in the hydrolysis of both basic sodium borohydride and ammonia-borane solutions. They were prepared in situ from the reduction of cobalt(II) ions adsorbed on hydroxyapatite with sodium borohydride. Hydroxyapatite-supported cobalt(0) nanoclusters were stable enough to be isolated as solid material and characterized by inductively coupled plasma optical emission spectroscopy (ICP-OES), X-ray diffraction (XRD), attenuated total reflectance infrared (ATR-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) spectroscopy. They are isolable, redispersible, highly active, and cost-effective catalysts for hydrogen generation from the hydrolysis of both sodium borohydride and ammonia-borane even at low concentrations and temperature, providing 25,600 and 7400 turnovers and maximum hydrogen generation rates of 5.0 and 2.2 LH2 min(-1) (gCo)(-1) by the hydrolysis of NaBH4 and H3NBH3 at 25.0 +/- 0.1 degrees C, respectively. Hydroxyapatite-supported cobalt(0) nanoclusters provide activation energy of 53 +/- 2 kJ/mol for the hydrolysis of sodium borohydride and 50 +/- 2 kJ/mol for the hydrolysis of ammonia-borane. (C) 2011 Elsevier B. V. All rights reserved.

Subject Keywords

Hydroxyapatite, Cobalt, Nanoclusters, Sodium borohydride, Ammonia-borane, Hydrolysis, Hydrogen

URI

https://hdl.handle.net/11511/34842

Journal

CATALYSIS TODAY

DOI

https://doi.org/10.1016/j.cattod.2011.04.022

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

Hydroxyapatite-supported palladium(0) nanoclusters as effective and reusable catalyst for hydrogen generation from the hydrolysis of ammonia-borane Rakap, Murat; Özkar, Saim (2011-06-01) 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 analytic...
Hydrogen generation from the hydrolysis of ammonia-borane using intrazeolite cobalt(0) nanoclusters catalyst Rakap, Murat; Özkar, Saim (2010-04-01) Previously being used as highly active catalyst in the hydrolysis of sodium borohydride, intrazeolite cobalt(0) nanoclusters were also employed as catalyst in the hydrolysis of ammonia-borane (H(3)NBH(3)). Intrazeolite cobalt(0) nanoclusters were found to be active catalyst in this hydrolysis reaction of ammonia-borane providing 5450 total turnovers at room temperature before deactivation. The results of the kinetic study shows that the catalytic hydrolysis of AB is first order with respect to the catalyst ...
Zeolite confined palladium(0) nanoclusters as effective and reusable catalyst for hydrogen generation from the hydrolysis of ammonia-borane Rakap, Murat; Özkar, Saim (2010-02-01) Zeolite confined palladium(0) nanoclusters were prepared by a two step procedure: incorporation of Pd2+ ions into the zeolite-Y by ion-exchange followed by the reduction of Pd2+ ions in the supercages of zeolite-Y with sodium borohydride at room temperature. Zeolite confined palladium(0) nanoclusters are stable enough to be isolated as solid materials and characterized by ICP-OES, XRD, HRTEM, SEM, X-ray photoelectron spectroscopy and N-2 adsorption technique. These nanoclusters are isolable, redispersible a...
Poly(4-styrenesulfonic acid-co-maleic acid) stabilized cobalt(0) nanoparticles: A cost-effective and magnetically recoverable catalyst in hydrogen generation from the hydrolysis of hydrazine borane Karahan, Senem; Özkar, Saim (2015-02-09) Herein, we report the in situ generation, isolation and characterization of cobalt(0) nanoparticles, stabilized by poly(4-styrenesulfonic acid-co-maleic acid), PSSMA, and their catalytic activity in the hydrolysis of hydrazine borane (HB). Cobalt(0) nanoparticles having average particle size of 3.1 +/- 0.5 nm were prepared by in situ reduction of cobalt(II) chloride in aqueous solution of hydrazine borane in the presence of PSSMA, isolated magnetically from the catalytic reaction solution using a magnet, an...
Polymer-immobilized palladium supported on TiO2 (Pd-PVB-TiO2) as highly active and reusable catalyst for hydrogen generation from the hydrolysis of unstirred ammonia-borane solution Rakap, Murat; Kalu, Egwu Eric; Özkar, Saim (Elsevier BV, 2011-01-01) Herein we report the preparation, characterization and the catalytic use of the polymer-immobilized palladium catalyst supported on TiO2 (Pd-PVB-TiO2) in the hydrolysis of unstirred ammonia-borane solution. The polymer-immobilized palladium catalyst is stable enough to be isolated as solid materials and characterized by XRD, SM, and EDX. The immobilized palladium catalyst supported on TiO2 is found highly active, isolable, and reusable in the hydrolysis of unstirred ammonia-borane even at low concentrations...

Citation Formats

M. Rakap and S. Özkar, “Hydroxyapatite-supported cobalt(0) nanoclusters as efficient and cost-effective catalyst for hydrogen generation from the hydrolysis of both sodium borohydride and ammonia-borane,” CATALYSIS TODAY, pp. 17–25, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34842.