The facile preparation of Cu–Zn–Al oxide composite catalysts with high stability and performance for the production of dimethyl ether using modified aluminum alkoxide

Single-Pot Synthesis of NiMo-Al2O3 Catalyst for Quinoline Hydrodenitrogenation

“…In addition, the spectrum of NM-CA exhibits a strong band at 220–280 nm and a weak band at around 280–320 nm, suggesting the formation of more isolated tetrahedral Mo species. As confirmed by previous work of our group, the hydrolysis/alcoholysis process can change the surface area of the CuZnAl catalyst and determine the size of the active metal. The absorption edge energy ( E g ) values are often used to estimate the Mo species dispersion of the oxidic catalysts. − As can be seen in Figure B, the E g values of NM-CA (3.14 eV) and NM-eth (3.11 eV) are lower than those of NM-iso (3.17 eV) and NM-dh (3.23 eV).…”

“…Baston et al incorporated precursor salts of Ni and Mo into the sol mixture of the γ-Al 2 O 3 –ZrO 2 support during the hydrolysis step, with aluminum trisec-butoxide and zirconium propoxide as raw materials. As for the preparation of alumina support, hydrolysis of aluminum alkoxides by water was one of the most important methods. , Also, alcohol solvents could react with aluminum alkoxides, which was called as the alcoholysis reaction . It was reported that the hydrolysis/condensation reactions of aluminum isopropoxide (AIP) could be adjusted by a prealcoholysis step of AIP, which enhanced the catalytic performance of the CuZnAl catalyst for dimethyl ether synthesis from carbon monoxide hydrogenation .…”

“…As for the preparation of alumina support, hydrolysis of aluminum alkoxides by water was one of the most important methods. , Also, alcohol solvents could react with aluminum alkoxides, which was called as the alcoholysis reaction . It was reported that the hydrolysis/condensation reactions of aluminum isopropoxide (AIP) could be adjusted by a prealcoholysis step of AIP, which enhanced the catalytic performance of the CuZnAl catalyst for dimethyl ether synthesis from carbon monoxide hydrogenation . Thus, using alcohol as a solvent might change the sol–gel reaction system for one-pot synthesis of the NiMo-Al 2 O 3 catalyst.…”

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

“…However, for the reduced sample, E b (Cu2p 3/2 ) and E k (CuL 3 VV) values are 932.89 and 918.02 eV, respectively, giving an α′(Cu) of 1850.91 eV, which is associated with Cu 0 . 35 Therefore, it could be deduced that only metallic copper is present on the surface of the catalysts after in situ reduction.…”

Continuous Hydrogenation of Ethyl Levulinate to γ-Valerolactone over Cu-Zn/ZrO2 Catalyst with Alumina Binder

“…The ratio of Cu:Zn 2:1 was chosen according to previous studies. 28 Cu-Zn/ ZrO 2 -m%Al 2 O 3 (m = the weight percent of Al 2 O 3 in the catalyst) was prepared by kneading a mixture of ZrO 2 and pseudo-boehmite (the precursor of Al 2 O 3 binder) together with the precipitates of Cu-Zn carbonates or hydroxides according to our previous studies. 29 For example, Cu-Zn/ZrO 2 -20%Al 2 O 3 was prepared as follows.…”