A study of ethanol dehydrogenation to acetaldehyde over supported copper catalysts: Catalytic activity, deactivation and regeneration

Heterogeneous Catalysis in (Bio)Ethanol Conversion to Chemicals and Fuels: Thermodynamics, Catalysis, Reaction Paths, Mechanisms and Product Selectivities

“…Very high selectivities can be obtained at a moderate conversion over some metallic catalysts such as gold [31] and copper [32], while over some copper catalysts, high selectivities were obtained also at quite high conversion. In our experimental conditions [33,34], we obtained acetaldehyde yields of 90 % over Cu/ZnAl 2 O 4 catalysts at 573-623 K, with a copper loading of 17 wt.%. At higher temperatures, full ethanol conversion was achieved but acetaldehyde yield declines due to the over-conversion to acetone, ethyl acetate and other products including propene.…”

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

“…This is probably because the formation of coke was affected by different copper loading or Cu dispersion. Moreover,Pampararo et al (2020) and…”

Zinc oxide-modified mordenite as an effective catalyst for the dehydrogenation of (bio)ethanol to acetaldehyde

“…63 Other supported Cu systems, such as Cu-ZnAl 2 O 4 also suffer from deactivation, although at slightly extended timescales (5-10 h). 64 It must be noted, however, that some modern preparation methods may lead to Cu based systems with comparable stabilities to ZnO (3.5)/Rb-MOR-(7) reported herein, e.g. a Cu-BEA with a stable lifetime of 100 h, 32 and a highly dispersed Cu/SiO 2 prepared by ammonia evaporation with a lifetime of 500 h. 65 Additionally, copper on calcium silicate catalysts have been reported to exhibit a remarkably stable acetaldehyde production, however the longest recorded reaction duration was 20 h. 66 Finally, ZnO (3.5)/Rb-MOR-(7) may present a desirable alternative to commercial copper chromite catalysts (e.g.…”