Characterization and performance within the WGS reaction of Cu catalysts obtained from hydrotalcites

Facile Synthesis of Efficient and Robust Cu–Zn–Al Catalysts by the Sol–Gel Method for the Water–Gas Shift Reaction

“…Cu/ZnO/Al 2 O 3 is an industrial catalyst employed in the WGS reaction, which achieved a ∼42% CO conversion at 300 °C with a high Cu loading. A comparison between the reaction rate-per-unit mass Cu reveals that CuZnAl-10 is ∼5 times higher than Cu/ZnO/Al 2 O 3 (Figure ), and the superior WGS performance compared to reported Cu-based catalysts. ,,,,,,,– In addition, once CuZnAl-10 was evaluated at a low space velocity of 18,000 mL·g cat –1 ·h –1 , a good catalytic activity with a CO conversion of ∼90% was obtained at low temperature (200 °C) (Figure S2), which indicates its potential applications for the low-temperature WGS reaction.…”

“…For the WGS reaction, Cu 0 and Cu + species are recognized as the active sites for Cu-based catalysts. ,– Currently, the synergetic effect between Cu 0 and Cu + species has been reported, wherein Cu + species are responsible for the adsorption of CO, and Cu 0 nanoparticles act as active sites for the dissociation of water. , Nonetheless, the regulation of Cu + and Cu 0 is commonly reliant on the Cu content or pretreatment parameters. ,,,, To further enhance the catalytic activity under optimal conditions, the introduction of promoters, such as Zn species, , is imperative. The function of ZnO in the Cu–Zn–Al catalysts is currently subject to varying perspectives.…”