Comparative Study of the Electrochemical Promotion of CO2 Hydrogenation over Ru‐Supported Catalysts using Electronegative and Electropositive Promoters. Issue 1 (2nd January 2014)

• Record Type: Journal Article
• Authors: Theleritis, Demetrios; Makri, Marialena; Souentie, Stamatios; Caravaca, Angel; Katsaounis, Alexandros; Vayenas, Constantinos G.
• Is Part Of: ChemElectroChem. Volume 1:Issue 1(2014)
• Page Start: 254
• Page End: 262
• Publication Date: 2014-01-02
• Subjects: Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201300185
• Languages: English
• ISSNs: 2196-0216

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The kinetics and the electrochemical promotion of the hydrogenation of CO₂ over Ru‐catalyst electrodes deposited on yttria‐stabilized zirconia (YSZ) and (Na⁺)‐β"‐Al₂O₃ solid electrolytes are investigated at temperatures between 200 and 340 °C and pressures up to 5 bar. In the case of both the O²⁻ conductor (YSZ) and the Na⁺ conductor (β"‐Al₂O₃), the selectivity for CH₄ production is enhanced significantly when using a positive potential by supplying of O²⁻ to, or removal of Na⁺ from, the catalyst surface. The opposite effect is observed when using a negative applied potential, which suppresses CH₄ formation and enhances the production of CO through the reverse water–gas shift reaction. However, at low Na coverage, and under reducing conditions, both methanation and H₂ production are promoted by the application of a negative potential. The observed electrochemical promotion behavior in conjunction with the reaction kinetics is consistent with the rules of electrochemical and chemical promotion.</p> </abstract>