H-2 production from the hydrolytic dehydrogenation of methylamine-borane catalyzed by sulfonated reduced graphene oxide-aided synthesis of ruthenium nanoparticles


Yildirim R., Gülcan M.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol.46, no.64, pp.32523-32535, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 64
  • Publication Date: 2021
  • Doi Number: 10.1016/j.ijhydene.2021.07.096
  • Title of Journal : INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Page Numbers: pp.32523-32535
  • Keywords: Hydrogen, Hydrolytic dehydrogenation, Methylamine borane, Nanoparticles, Sulfonated reduced graphene oxide, Ruthenium, HIGHLY EFFICIENT CATALYST, CORE-SHELL NANOPARTICLES, AMMONIA-BORANE, HYDROGEN GENERATION, DURABLE CATALYSTS, HYDRAZINE-BORANE, METHANOLYSIS, PERFORMANCE, REDUCTION, RU

Abstract

A new catalyst was prepared using sulfonated reduced graphene oxide support with a large surface area containing ruthenium nanoparticles (Ru@rGO-SO3H). The developed Ru@rGO-SO3H catalyst was used in the hydrogen production process from the hydrolytic dehydrogenation of methylamine-borane (MeAB). Sulfonated reduced graphene oxide and the developed catalyst were characterized by Raman and FT-IR spectroscopies, ICP-OES, XRD, XPS, TEM, TEM-EDX, SEM and SEM-EDX techniques. The average particle size of Ru nano particles, which were homogeneously distributed on the sulfonated reduced graphene oxide surface, was found as 2.2 +/- 0.2 nm. After analyzing the effect of nanocatalyst and substrate concentrations on the catalytic reaction, reactions were realized at different temperatures, the efficiency of the Ru@rGO-SO3H nanocatalyst in initial turnover frequency (TOFinitial) and the activation parameters (E-a, Delta H-# and Delta S-#) were calculated. According to the data obtained, the TOFinitial value was calculated as 5300.86 h(-1) (88.35 min(-1)). E-a, Delta H-# and Delta S-# values were also calculated as 53.83 kJ/mol, 50.73 kJ/mol and -51.55 J/mol.K, respectively. Finally, when the reusability performance results of the catalyst are evaluated, it is found that the catalyst is very stable and retains its initial effectiveness to a great extent (>95%) after the 5th reuse. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.