Use of CuNi/YSZ and CuNi/SDC Catalysts for the Reverse Water Gas Shift Reaction. (17th February 2015)

• Record Type: Journal Article
• Authors: Lortie, Maxime; Isaifan, Rima J.
• Other Names: Idriss Hicham Academic Editor.
• Is Part Of: Journal of catalysts. Volume 2015(2015)
• Publication Date: 2015-02-17
• Subjects: Catalysts -- Periodicals; Catalysts; Periodicals; 541.395
• DOI: 10.1155/2015/601709
• Languages: English
• ISSNs: 2314-5102

Abstract

Abstract : Cu50 Ni50 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 Cu50 Ni50 /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 Cu50 Ni50 /SDC catalyst was found to be thermally stable for 48 hours at 600/700°C.