On the Mn promoted synthesis of higher alcohols over Cu derived ternary catalysts

Abstract

This work provides insight into the promotional effect of Mn on the synthesis of higher alcohols over Cu-based ternary catalysts through XPS and in situ DRIFTS and powder XRD.

Effects of Mn, Zr and Ni Promoters on the Performance of CuZnO Catalyst for Ethanol Synthesis via CO Hydrogenation

“…In the second route, Cu + acts as the Lewis acid site and electrophilic, promoting the dissociation of CÀ O into CH x species in CH x O, while Cu 0 species contributes to the dissociation of H 2 . [13,14] CH 3 O is dissociated to generate CH 3 , and CO is inserted into CH 3 to generate CH 3 CO, which is further hydrogenated to produce ethanol. However, partially undissociated CH 3 O is easier to hydrogenate to methanol.…”

“…The generation of CH 3 O is caused by the step‐by‐step hydrogenation of CO or the combination of surface OH* and CO to generate COOH. In the second route, Cu + acts as the Lewis acid site and electrophilic, promoting the dissociation of C−O into CH x species in CH x O, while Cu 0 species contributes to the dissociation of H 2 [13,14] . CH 3 O is dissociated to generate CH 3 , and CO is inserted into CH 3 to generate CH 3 CO, which is further hydrogenated to produce ethanol.…”

“…According to the above report, the different transition metals promoters can increase the specific surface area of the catalysts, improve the dispersity and reducibility of Cu species, [12] and enhance the acidity and alkalinity of the catalysts [13] . Suitable promoters can not only increase the CO conversion of the catalyst, but also promote the ethanol selectivity.…”

“…According to the above report, the different transition metals promoters can increase the specific surface area of the catalysts, improve the dispersity and reducibility of Cu species, [12] and enhance the acidity and alkalinity of the catalysts. [13] Suitable promoters can not only increase the CO conversion of the catalyst, but also promote the ethanol selectivity. However, in our previous studies, it is found that the syngas could be directly catalyzed to ethanol over CuZnO catalysts without promoters by a complete liquid-phase method in a slurry bed reactor.…”

CO2 conversion over Cu–Mo2C catalysts: effect of the Cu promoter and preparation method

“…evidence the presence of Cu 2+ species [43]. Indeed, spectral deconvolution reveals Cu 2p transitions corresponding to Cu 2+ (~934.3 eV) and Cu + /Cu° (932.8 eV) [29], [42], [43] in these two materials.…”