Direct synthesis of dimethyl carbonate with CO2and CH3OH catalyzed by KOH/C under supercritical conditions

作者：Xing Shi Cai; Zheng Lan; Wang Yu Qi^*; Zou Yong Qiang; Yuan Wei Jian; Ni Shi Feng; Chen Kai Xun

来源：Journal of Chemical Engineering of Chinese Universities, 2015, 29(5): 1120-1125.

DOI：10.3969/j.issn.1003-9015.2015.05.014

• Activated carbon supported
• Active charcoal
• Brunauer emmett tellers
• Dimethyl carbonate
• Direct synthesis
• Large specific surface areas
• Supercritical carbon dioxides
• Supercritical condition

A series of solid base catalysts were prepared for the direct synthesis of dimethyl carbonate (DMC) using CO2and CH3OH. These catalysts were prepared via an iso-volumic impregnation method using KOH as an active component which was supported by silica gel, magnesium oxide, activated carbon and alumina respectively. The experimental results show that the catalytic activity of the activated carbon supported KOH has the best performance. The catalysts were characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD) and scanning electron microscope (SEM), and the experimental results show that the activated carbon with large specific surface area tends to be a good carrier. After high temperature calcination, KOH decomposes into K2O crystal which improves its catalytic activation. K2O disperses well on the surface and inner wall of the carriers. The effects of KOH loading amount, additive composition, reaction temperature and pressure were investigated and the reaction process was optimized. The yield of DMC is 8.5% under the optimum conditions, which is superior to the existing results of supercritical heterogeneous catalysis of DMC synthesis reported in the literature.

• 出版日期2015
• 单位西北大学