Show/Hide Menu
Hide/Show Apps
anonymousUser
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Açık Bilim Politikası
Açık Bilim Politikası
Frequently Asked Questions
Frequently Asked Questions
Browse
Browse
By Issue Date
By Issue Date
Authors
Authors
Titles
Titles
Subjects
Subjects
Communities & Collections
Communities & Collections
Magnetically separable rhodium nanoparticles as catalysts for releasing hydrogen from the hydrolysis of ammonia borane
Date
2019-10-01
Author
Tonbul, Yalcin
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
9
views
0
downloads
Magnetically separable catalysts attract considerable attention in catalysis due to their facile separation from the reaction medium. This propensity is crucial for efficient multiple use of precious noble metal nanoparticles in catalysis. In fact, the isolation of catalysts from the reaction medium by filtration and washing results usually in the loss of huge amount of activity in the subsequent run of catalysis. Although many transition metal nanoparticle catalysts have been reported for the H-2 generation from the hydrolysis of ammonia borane, there is no study reporting the magnetically separable rhodium based catalysts for the hydrolytic dehydrogenation of ammonia borane. Here, we report the preparation of rhodium(0) nanoparticles supported on the surface of Fe3O4 and CoFe2O4 magnetic nanopowders as the first example of magnetically separable rhodium nanocatalysts. The resulting magnetically separable Rh-0/Fe3O4 and Rh-0/CoFe2O4 nanoparticles are highly active, long-lived and reusable catalysts in H-2 generation from the hydrolysis of ammonia borane providing a turnover frequency value of 273 and 720 min(-1), respectively, at 25.0 +/- 0.1 degrees C. These magnetically separable catalysts show high reusability and long-term stability in the hydrolysis reaction. They retain their complete initial activity even after the 5th use releasing exactly 3.0 equivalent H-2 gas per mole of ammonia borane. The long-term stability tests show that Rh-0/Fe3O4 and Rh-0/CoFe2O4 nanoparticles provide a total turnover number of 125,000 and 245,000, respectively, in releasing H-2 from the hydrolysis of ammonia borane at room temperature. The long term stability and reusability of magnetically separable Rh-0/Fe3O4 and Rh-0/CoFe2O4 nanopartides make them attractive catalysts for hydrogen generation in fuel cell applications.
Subject Keywords
Colloid and Surface Chemistry
,
Electronic, Optical and Magnetic Materials
,
Surfaces, Coatings and Films
,
Biomaterials
URI
https://hdl.handle.net/11511/44621
Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
DOI
https://doi.org/10.1016/j.jcis.2019.06.038
Collections
Department of Chemistry, Article