One‐Pot Synthesis of Cyclodextrin‐Doped Cu‐SiO₂ Catalysts for Efficient Hydrogenation of Dimethyl Oxalate to Ethylene Glycol

Abstract

The β‐cyclodextrin (β‐CD) was successfully applied to synthesize Cu‐SiO2 catalysts by the sol‐gel method. The first and most important question addressed was increasing the copper loading with higher dispersion in the silica support. Another task was to elucidate the structure–performance relationship. Furthermore, catalysts with various β‐CD doping levels were systematically characterized and employed in the hydrogenation of dimethyl oxalate (DMO) to ethylene glycol (EG). The 0.1CD‐Cu‐SiO2 catalyst with 17.39 wt % copper showed 99.9 % DMO conversion and the highest EG selectivity of 95.0 % at 210 °C, as well a lifetime of over 240 h. The reaction results disclosed that the catalytic performance could be tuned facilely by changing the amount of β‐CD doping, which effectively influenced the Cu metallic surface area and dispersion.

Curing Behavior of Waterborne Paint Containing Catalyst Encapsulated in Micelle

“…A catalyst that remains functionally inactive at temperatures of 40 • C or lower and activates at temperatures of 100 • C or higher is called a switchable catalyst. A wide range of technologies have been reported to realize these catalytic switching properties, including encapsulating the catalyst in compounds such as cyclodextrin [9][10][11][12][13][14][15][16]. For instance, Wang et al reported smart supramolecular nano-enzymes with temperature-driven switching properties have been successfully constructed by the selfassembly of supra-amphiphiles formed by the cyclodextrin-based host-guest chemistry [9].…”

Boron Modified Bifunctional Cu/SiO2 Catalysts with Enhanced Metal Dispersion and Surface Acid Sites for Selective Hydrogenation of Dimethyl Oxalate to Ethylene Glycol and Ethanol

“…sented the highest Sel. EG of 95.0% at 210 °C [22]. Chen et al have synthesized mannitol modified Cu/SiO2 catalysts by ammonia evaporation method, which showed excellent catalytic activity (average Sel.…”

Fabrication Method‐Engineered Cu–ZnO/SiO2 Catalysts with Highly Dispersed Metal Nanoparticles toward Efficient Utilization of Methanol as a Hydrogen Carrier

“…The main stretching bands at %1100, 800, and 473 cm À1 belong to the Si─O bonds of amorphous SiO 2 support. [21] The other two peaks at 1645 and 970 cm À1 are attributed to the OH groups of adsorbed water and Cu─O─Si species, respectively. [22] The characteristic adsorption peak of copper phyllosilicate at around 670 cm À1 was not observed, indicating TOF values were calculated using Cu active sites according to the previously reported formula.…”