Table of Contents
Journal of Catalysts
Volume 2015, Article ID 601709, 9 pages
http://dx.doi.org/10.1155/2015/601709
Research Article

Use of CuNi/YSZ and CuNi/SDC Catalysts for the Reverse Water Gas Shift Reaction

1Chemical and Biological Engineering, University of Ottawa, Ottawa, ON, Canada K1N 6N5
2Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON, Canada K1N 6N5

Received 6 October 2014; Revised 18 January 2015; Accepted 19 January 2015

Academic Editor: Hicham Idriss

Copyright © 2015 Maxime Lortie and Rima J. Isaifan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Cu50Ni50 nanoparticles were synthesized using a modified polyol method and deposited on samarium-doped ceria, SDC, and yttria-stabilized zirconia, YSZ, supports to form reverse water-gas shift, RWGS, catalysts. The best CO yields, obtained with the Cu50Ni50/SDC catalyst, were about 90% of the equilibrium CO yields. In contrast CO yields using Pt/SDC catalysts were equal to equilibrium CO yields at 700°C. Catalyst selectivity to CO was 100% at hydrogen partial pressures equal to CO2 partial pressures, 1 kPa, and decreased as methane was formed when the hydrogen partial pressure was 2 kPa or greater. The reaction results were explained using a combination of Eley-Rideal and Langmuir-Hinshelwood mechanisms that involved adsorption on the metal surface and the concentration of oxygen vacancies in the support. Finally the Cu50Ni50/SDC catalyst was found to be thermally stable for 48 hours at 600/700°C.