Vapor-Phase Oxidant-Free Dehydrogenation of 2,3- and 1,4-Butanediol over Cu/SiO2 Catalyst Prepared by Crown-Ether-Assisted Impregnation

Abstract

A silica-supported copper (Cu/SiO2) catalyst containing highly dispersed Cu nanoparticles was prepared via a crown-ether-assisted impregnation method. A 12-crown-4-ether-assisted Cu/SiO2 catalyst outperformed several Cu/SiO2 catalysts prepared with various organic additives in the dehydrogenation of 2,3- and 1,4-butanediol. It was found that the catalytic activity, i.e., the formation rate of acetoin from 2,3-butanediol and that of γ-butyrolactone from 1,4-butanediol, was proportional to the copper surface area.

Dehydrogenation of Diethylene Glycol to Para-Dioxanone over Cu/SiO2 Catalyst: Effect of Structural and Surface Properties

“…Correspondingly, the Cu surface area estimated by N 2 O titration also gave a distinct value of 14.5 m 2 /g for CuSi-dp and 46.1 m 2 /g for CuSi-ae, respectively. The increased active site exposure by high dispersion (22.3% vs. 7.1%) was believed to elevate the dehydrogenation efficiency [16,17].…”

“…Correspondingly, t Cu surface area estimated by N2O titration also gave a distinct value of 14.5 m 2 /g for Cu dp and 46.1 m 2 /g for CuSi-ae, respectively. The increased active site exposure by high d persion (22.3% vs. 7.1%) was believed to elevate the dehydrogenation efficiency [16,17] In order to investigate the redox capacity, an H2-TPR experiment was conducted the two catalysts, and Figure 6 gives the reduction curves. Apparently, CuSi-dp emerg as the main peak at 162.8 °C, corresponding to the reduction of lattice oxygen in bulk Cu crystallite.…”

Catalytic Valorisation of Biomass-Derived Levulinic Acid to Biofuel Additive γ-Valerolactone: Influence of Copper Loading on Silica Support

“…The catalyst's structure depends on factors such as copper loading, method of synthesis, and calcination conditions. Cu/SiO 2 catalysts exhibit excellent catalytic activity for various reactions, including hydrogenation, dehydrogenation, oxidation, and coupling reactions [10,[57][58][59][60]. The presence of Cu nanoparticles on the SiO 2 support enhances the catalyst's performance due to its high surface area and dispersion of active sites.…”