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

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 350-430 & DEG;C at ambient pressure and at different CO2 to H-2 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.

Automated summary

Electrochemical promotion was used to enhance the activity and selectivity of a Rh catalyst electrode in the CO2 hydrogenation reaction. Experiments were conducted at temperatures ranging from 350 to 430 degrees Celsius and with varying CO2 to H2 gas feeding ratios. The main reaction products observed were CO and CH4, and their formation rates were influenced by the applied potential or current. The results demonstrate the potential of electrochemical promotion for fine-tuning the activity and selectivity of reactions with significant technical and environmental importance.