Electrochemical promotion of the CO2 hydrogenation reaction using thin Rh, Pt and Cu films in a monolithic reactor at atmospheric pressure

Tuning of Catalytic Activity by Thermoelectric Materials for Carbon Dioxide Hydrogenation

“…Notably for Pt(80)/BCSO @ 1:4, the CO selectivity was 100% at 656 K. The CO selectivities observed at these temperatures were also much higher than the predicted values under the consideration of thermal equilibrium. [13,15,16] These results indicate that the Seebeck voltage promoted the conversion to CO and forward reaction in Equation (1), hence changed the TEC. This agrees with the observation that an electric field (via the NEMCA mechanism) shifted the chemical equilibrium, increased the RWGS reaction, and decreased the (backward) water-gas shift reaction.…”

“…[15] These results also agree with the observations in NEMCA of CO 2 hydrogenation in that a negative (reduced) potential increased the selectivity and reaction rate to CO, and a positive (increased) potential increased the selectivity and reaction rate to CH 4 . [13,17] From the above discussion, all the above observed results can be explained by Equation (4), i.e., the change of work function lead to the promotion of catalytic activity. This mechanism based on the change of work function through the in situ and controlled TE effect suggests that TEPOC is an effective mechanism for any metallic catalysts, regardless of their properties such as particle size or total amount of the metal.…”

“…This may not be a total surprise, as BCSO is electrically conductive, and other conductive oxides have been found to be good catalysts. [12] Moreover, Cu and CuO catalysts are widely used for CO 2 hydrogenation, [13] so the CuO containing BCSO itself could have very low catalytic activity even without thermoelectric promotion. The first measured CO 2 conversion (0.3%) was at 493 K under TE conditions and 633 K under RTE conditions (0.8%).…”

“…To the best of our knowledge, 48.4% is the highest reported CO 2 conversion to CO (with 100% CO selectivity) at atmosphere pressure below 673 K with an inlet gas ratio CO 2 /H 2 no larger than 4. [13,15,16] How can the CO 2 conversion to CO exceeds the TEC at 673 K? It can be seen from Figure 6b that at temperatures T h > 678 K, the CO selectivity was >95% for all the samples.…”

Recent advances in catalytic hydrogenation of carbon dioxide

“…Moreover, a monolithic electropromoted reactor (MEPR) with Rh/YSZ/Pt or Cu/TiO 2 / YSZ/Au cells was used to investigate the hydrogenation of CO 2 at atmospheric pressure. 89 In the case of Rh/YSZ/Pt cells, …”