Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
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
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
167
views
0
downloads
Cite This
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
Suggestions
OpenMETU
Core
Ruthenium(0) nanoparticles supported on bare or silica coated ferrite as highly active, magnetically isolable and reusable catalyst for hydrogen generation from the hydrolysis of ammonia borane
Sarıca, Esra; Özkar, Saim; Department of Chemistry (2019)
Ruthenium(0) nanoparticles supported on bare or silica-coated magnetite are prepared by impregnation of ruthenium(Ш) ions on the surface of support followed by their reduction with aqueous solution of sodium borohydride. The materials are magnetically isolated from the reaction solution and characterized by a combination of advanced analytical techniques including ICP-OES, BET, XRD, SEM-EDS, TEM, XPS. These magnetically isolable nanoparticles are used as catalyst in hydrogen generation from the hydrolysis o...
Ruthenium(0) nanoparticles supported on nanohafnia: A highly active and long-lived catalyst in hydrolytic dehydrogenation of ammonia borane
Kalkan, Elif Betul; Akbayrak, Serdar; Özkar, Saim (2017-04-01)
Ruthenium(0) nanoparticles supported on nanohafnia (Ru-0/HfO2) were prepared by impregnation of ruthenium(III) cations on the surface of hafnia followed by their reduction with sodium borohydride at room temperature. Ru-0/HfO2 samples were isolated from the reaction solution by centrifugation and characterized by a combination of advanced analytical techniques including ICP-OES, BET, XRD, SEM-EDS, TEM, XPS. The catalytic activity of Ru-0/HfO2 samples with various ruthenium loading in the range 0.5-5.0% wt R...
Ruthenium(0) nanoparticles supported on magnetic silica coated cobalt ferrite: Reusable catalyst in hydrogen generation from the hydrolysis of ammonia-borane
Akbayrak, Serdar; KAYA, MURAT; Volkan, Mürvet; Özkar, Saim (Elsevier BV, 2014-11-15)
Ruthenium(0) nanoparticles supported on magnetic silica-coated cobalt ferrite (Ru(0)/SiO2-CoFe2O4) were in situ generated from the reduction of Ru3+/SiO2-CoFe2O4 during the catalytic hydrolysis of ammonia-borane (AB). Ruthenium(III) ions were impregnated on SiO2-CoFe2O4 from the aqueous solution of ruthenium(III) chloride and then reduced by AB at room temperature yielding Ru(0)/SiO2-CoFe2O4 which were isolated from the reaction solution by using a permanent magnet and characterized by ICP-OES, XRD, TEM, TE...
Ruthenium(0) nanoparticles supported on nanotitania as highly active and reusable catalyst in hydrogen generation from the hydrolysis of ammonia borane
Akbayrak, Serdar; Tanyildizi, Seda; Morkan, Izzet; Özkar, Saim (Elsevier BV, 2014-06-01)
Ruthenium(0) nanoparticles supported on the surface of titania nanospheres (Ru(0)/TiO2) were in situ generated from the reduction of ruthenium(III) ions impregnated on nanotitania during the hydrolysis of ammonia borane. They were isolated from the reaction solution by centrifugation and characterized by a combination of advanced analytical techniques. The results reveal that highly dispersed ruthenium(0) nanoparticles of size in the range 1.5-3.3 nm were formed on the surface of titania nanospheres. Ru(0)/...
Ruthenium(0) nanoparticles supported on xonotlite nanowire: a long-lived catalyst for hydrolytic dehydrogenation of ammonia-borane
Akbayrak, Serdar; Özkar, Saim (Royal Society of Chemistry (RSC), 2014-01-01)
Ruthenium(0) nanoparticles supported on xonotlite nanowire (Ru(0)@X-NW) were prepared by the ion exchange of Ru3+ ions with Ca2+ ions in the lattice of xonotlite nanowire followed by their reduction with sodium borohydride in aqueous solution at room temperature. Ru(0)@X-NW were characterized by a combination of advanced analytical techniques. The results show that (i) highly dispersed ruthenium(0) nanoparticles of 4.4 +/- 0.4 nm size were formed on the surface of xonotlite nanowire, (ii) Ru(0)@X-NW show hi...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
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.