Group 4 oxides supported Rhodium(0) catalysts in hydrolytic dehydrogenation of ammonia borane


Tonbul Y., Akbayrak S., ÖZKAR S.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol.44, no.27, pp.14164-14174, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 44 Issue: 27
  • Publication Date: 2019
  • Doi Number: 10.1016/j.ijhydene.2018.11.162
  • Title of Journal : INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Page Numbers: pp.14164-14174
  • Keywords: Titania, Zirconia, Hafnia, Rhodium nanoparticles, Ammonia borane, HIGHLY-ACTIVE CATALYST, LONG-LIVED CATALYST, HYDROGEN GENERATION, REUSABLE CATALYST, EFFICIENT CATALYSTS, RU NANOPARTICLES, RH NANOPARTICLES, PALLADIUM(0) NANOCLUSTERS, RUTHENIUM NANOPARTICLES, FACILE SYNTHESIS

Abstract

Rh3+ ions are first impregnated on Group 4 metal oxides (TiO2, ZrO2, HfO2) in aqueous solution and, then reduced with aqueous solution of NaBH4 to form rhodium(0) nanoparticles (NPs) on the oxide surface. The analyses reveal that Rh(0) NPs are highly dispersed on the surface of TiO2, ZrO2, HfO2. Rh-0/MO2 (M: Ti, Zr, Hf) NPs have high activity and reusability in releasing H-2 from the hydrolysis of ammonia borane with an initial turnover frequency of 643, 198, and 188 min(-1), respectively, at 25.0 +/- 0.1 degrees C. The reusability of Rh-0/ZrO2 and Rh-0/HfO2 catalysts is higher than that of the Rh-0/TiO2 catalyst. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.