Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Electrochemical Promotion of CO2 Hydrogenation Using Rh Catalysts Supported on O2- Conducting Solid Electrolyte

Version 1 : Received: 8 June 2023 / Approved: 9 June 2023 / Online: 9 June 2023 (03:50:24 CEST)

A peer-reviewed article of this Preprint also exists.

Kokkinou, N.; Xydas, F.; Brosda, S.; Kyriakou, G.; Katsaounis, A. Electrochemical Promotion of CO2 Hydrogenation Using Rh Catalysts Supported on O2− Conducting Solid Electrolyte. Catalysts 2023, 13, 1014. Kokkinou, N.; Xydas, F.; Brosda, S.; Kyriakou, G.; Katsaounis, A. Electrochemical Promotion of CO2 Hydrogenation Using Rh Catalysts Supported on O2− Conducting Solid Electrolyte. Catalysts 2023, 13, 1014.

Abstract

Electrochemical Promotion was used to modify the activity and selectivity of a Rh catalyst-electrode in the CO2 hydrogenation reaction. The experiments were carried out in a temperature range of 350-430οC at ambient pressure and at different CO2 to H2 gas feeding ratios (1:2 to 4:1). The only reaction products observed were CO and CH4, both under open and closed-circuit conditions. The CH4 formation rate was found to increase with both positive and negative potential or current application. The CO formation rate followed the opposite trend. The selectivity to CH4 increased under high values of hydrogen partial pressure and decreased at high pressures of CO2. The results demonstrate how Electrochemical Promotion can be used to finely tune activity and selectivity for a reaction of high technical and environmental importance.

Keywords

Electrochemical Promotion of Catalysis (EPOC); non-Faradaic electrochemical modification of catalytic activity (NEMCA); CO2 Hydrogenation; Rh; Rhodium; YSZ; XPS

Subject

Engineering, Chemical Engineering

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