完全液相法与溶胶-凝胶法制备Cu-Zn-Al双功能催化剂对浆态床一步法合成二甲醚的催化性能比较

采用完全液相法和溶胶-凝胶法分别制备了组成完全相同的Cu-Zn-Al双功能催化剂,用XRD、氮气吸附-脱附实验和XPS等手段对催化剂的性质进行表征,考察了催化剂对浆态床一步法合成二甲醚反应的催化性能.结果表明,两种方法制备的Cu基催化剂中Cu组分的物相和表面Cu含量明显不同,而催化剂的织构性质基本相同.完全液相法制备的...

Comparison of Catalytic Performances Between Complete Liquid-phase's Catalyst and Sol-gel's Catalyst for Slurry Synthesis Dimethyl Ether

The Cu-Zn-Al bifunctional catalysts were respectively prepared by complete liquid-phase method and sol-gel method. The properties of catalysts were characterized by XRD, N2 adsorption and XPS, and the catalytic performance of catalysts for DME synthesis directly from syngas in a slurry reactor was evaluated. The results show that Cu species and surface Cu content in catalysts have obvious difference, but texture properties are similar. The catalyst prepared by complete liquid-phase method has high selectivity and good stability, and the catalyst specific surface area, pore volume, surface Cu content and Cu/Zn mole ratio increase after reaction. The catalyst prepared by sol-gel method has obvious deactivation, and average deactivation rate is 1.62 %/d. The decrease of specific surface area, pore volume, surface Cu content and Cu/Zn mole ratio after reaction are the reason of catalyst deactivation.