Ruthenium(0) Nanoparticles Supported on Multiwalled Carbon Nanotube As Highly Active Catalyst for Hydrogen Generation from Ammonia-Borane

Date

2012-11-01

Author

Akbayrak, Serdar
Özkar, Saim

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Ruthenium(0) nanoparticles supported on multiwalled carbon nanotubes (Ru(0)@MWCNT) were in situ formed during the hydrolysis of ammonia-borane (AB) and could be isolated from the reaction solution by filtration and characterized by ICP-OES, XRD, TEM, SEM, EDX, and XPS techniques. The results reveal that ruthenium(0) nanoparticles of size in the range 1.4-3.0 nm are well-dispersed on multiwalled carbon nanotubes. They were found to be highly active catalyst in hydrogen generation from the hydrolysis of AB with a turnover frequency value of 329 min(-1). The reusability experiments show that Ru(0)@MWCNTs are isolable and redispersible in aqueous solution; when redispersed they are still active catalyst in the hydrolysis of AB exhibiting a release of 3.0 equivalents of H-2 per mole of NH3BH3 and preserving 41% of the initial catalytic activity even after the fourth run of hydrolysis. The lifetime of Ru(0)@MWCNTs was measured as 26400 turnovers over 29 h in the hydrolysis of AB at 25.0 +/- 0.1 degrees C before deactivation. The work reported here also includes the kinetic studies depending on the temperature to determine the activation energy of the reaction (E-a = 33 +/- 2 kJ/mol) and the effect of catalyst concentration on the rate of the catalytic hydrolysis of AB, respectively.

Subject Keywords

Ruthenium nanoparticles, Carbon nanotube, Heterogeneous catalyst, Hydrogen generation, Ammonia borane, Hydrolysis

URI

https://hdl.handle.net/11511/62568

Journal

ACS APPLIED MATERIALS & INTERFACES

DOI

https://doi.org/10.1021/am3019146

Collections

Department of Chemistry, Article

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Citation Formats

S. Akbayrak and S. Özkar, “Ruthenium(0) Nanoparticles Supported on Multiwalled Carbon Nanotube As Highly Active Catalyst for Hydrogen Generation from Ammonia-Borane,” ACS APPLIED MATERIALS & INTERFACES, pp. 6302–6310, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/62568.