Key points are not available for this paper at this time.
CO 2 hydrogenation to produce high-value fuels like ethanol represents a cutting-edge research frontier, yet overcoming the low ethanol productivity remains a challenge. Herein, a series of Fe-promoted Rh/CeO 2 catalysts were prepared by varying the impregnation sequences, and investigated their catalytic performance of ethanol synthesis via CO 2 hydrogenation. The Fe/Rh/CeO₂ catalyst, fabricated through sequential Rh impregnation followed by Fe deposition, demonstrated remarkable performance, achieving 19.8 % ethanol selectivity at 10.8 % CO₂ conversion, with a notable one-pass ethanol productivity of 25.3 mmol·g Rh −1 ·h −1 . Characterization results revealed that sequential Rh impregnation prior to Fe can promote the Rh dispersion and metal-support interaction, enhancing CO₂ adsorption and dissociation capability. This interface also facilitates the transformation of absorbed b-CO 3 2− into CO(l), provides high concentrations of CO(l) and HCOO* intermediates simultaneously, and finally boosting the ethanol formation by the C − C coupling reaction. • Fe-promoted Rh/CeO 2 catalysts were prepared by varying the impregnation sequences. • Fe/Rh/CeO₂ was prepared by stepwise Rh impregnation before Fe introduction. • Fe/Rh/CeO₂ demonstrated remarkable performance of CO 2 hydrogenation to ethanol. • Stepwise Rh impregnation prior to Fe boosts the Rh dispersion and CO₂ adsorption. • The high concentrations of CO(l) and HCOO* intermediates facilitate C − C coupling.
Yu et al. (Mon,) studied this question.