Na promotes selective hydrogenation of CO2 to ethanol over CoMnO catalysts

The conversion of CO 2 into ethanol with value-added still exists challenge, especially the CO 2 hydrogenation over Co-based catalysts is still C1 product dominated by CH 4 . Here, we report a xNa-CoMnO catalyst to promoting ethanol synthesis from CO 2 hydrogenation. The experimental results indicated that there was almost no adsorption and conversion of CO 2 on pure Co 0 , and the CO 2 hydrogenation production of the CoMnO catalyst prepared by adding Mn was mainly CH 4 . The loading of Na not only increased the concentration of oxygen defects on the CoMnO catalyst, but also improved the strength of the Co-O in the CoMnO catalyst, which was able to adsorb effectively the undissociated *CO in the reaction process, and promote the C-C coupling between the *CO and the generated *CH x , promoted the synthesis of ethanol. Under optimized reaction conditions (240 °C, 3.0 MPa, GHSV = 1200 mL/g/h), the 2Na-CoMnO catalyst showed ethanol selectivity of 18.89 % and space-time yield of ethanol of 1.27 mmol/g/h, which exceeded most of the reported results. More importantly, beyond delivering an excellent-performance catalytic system, this study also provides fundamental insights for the rational design of Co-based catalysts for selective CO 2 -to-ethanol conversion.