Synthesizing hydrogen from ammonia over Ru incorporated SiO2 type nanocomposite catalysts

VARIŞLI D., Elverisli E. E.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol.39, no.20, pp.10399-10408, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 39 Issue: 20
  • Publication Date: 2014
  • Doi Number: 10.1016/j.ijhydene.2014.04.207
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.10399-10408
  • Keywords: Ammonia decomposition, COx-free hydrogen, Ruthenium-SiO2 nanocomposite, Hydrothermal synthesis, COX-FREE HYDROGEN, NH3 DECOMPOSITION, CARBON NANOTUBES, H-2 PRODUCTION, GENERATION, NANOPARTICLES, KINETICS, MCM-41, SIZE, ETHANOL
  • Gazi University Affiliated: Yes


In this study, Ruthenium incorporated SiO2 type nanocomposite catalysts were prepared for COx free hydrogen production by using one-pot hydrothermal synthesis procedure. Experiments which were carried out under the flow of pure ammonia (300 ml/min) presented that 86% ammonia conversion was obtained at 500 degrees C over the catalyst having RU/Si molar ratio of 0.060. Using promoter in the preparation of catalyst enhanced the catalytic activity especially for the ones prepared at low ruthenium loadings. While the catalyst that was prepared at a RU/Si molar ratio of 0.010 without promoter gave negligible activity at 500 degrees C, the promoted one gave 33% conversion at 500 degrees C and 73% at 600 degrees C. Experiments were also repeated with lower feed flow rate values of ammonia such as 60 ml/min and 5 ml/min. It was seen that catalyst prepared at a RU/Si molar ratio of 0.010 with promoter gave conversion value over 80% at 400 degrees C under the feed flow rate of 5 ml/min. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.