丙醇锌对完全液相法制备Cu-Zn-Al合成气一步法二甲醚催化剂性能的影响  

Effect of zinc propoxide on structure and performance of Cu-Zn-Al catalysts prepared by complete liquid-phase technology for one-step synthesis of dimethyl ether from syngas

作　　者：张小雨[1] 黄伟[1] 高志华[1] 张琳[1] 时培祥 边仲凯 

机构地区：[1]太原理工大学,煤科学与技术教育部和山西省重点实验室,山西太原030024

出　　处：《天然气化工—C1化学与化工》2017年第1期17-21,26,共6页Natural Gas Chemical Industry

基　　金：国家自然科学基金重点项目(21336006),国家自然科学基金面上项目(21176176);高等学校博士学科点专项(优先发展领域)(20111402130002)资助

摘　　要：分别以自制丙醇锌和硝酸锌为原料,用完全液相法制备了Cu-Zn-Al催化剂,利用FTIR、XRD、H_2-TPR、BET对两种催化剂进行了表征,分别考察了醇盐丙醇锌和硝酸锌对Cu-Zn-Al催化剂的性能的影响。结果表明,以丙醇锌为锌源的催化剂可以明显提升催化剂的CO转化率,其CO转化率和二甲醚的选择性分别可达70.49%和60.51%。催化剂的表征结果表明,丙醇锌可以明显改变催化剂的织构性质,改变催化剂N_2吸附脱附等温线滞后环的形状,明显增大催化剂的比表面积,增大Cu^+的分散性和稳定性,同时丙醇锌催化剂可获得较多的还原物质,从而提升催化剂的整体性能。Cu-Zn-Al catalysts were prepared bycomplete liquid-phase method with self-made zinc propoxide and zinc nitrate as raw material, respectively, and eharacterizedby F＇FIR, XRD, TPR and BET. The effect of zinc propoxide and zinc nitrate on the performance of Cu-Zn-A1 catalyst were investigated. The results show that using zinc propoxide as the zinc source could significantly improve CO conversion and the conversion of CO and the selectivity of DME could reach 70.49% and 60.51%, respectively. Catalyst characterization results show that zinc propoxide significantly changed the texture properties of the catalyst and the shape of hysteresis loop in N2 adsorption-desorption isotherm of catalyst, increased the specific surface area and obtained more reducing substances. Besides, it increased the dispersion and stability of Cu＋, thus enhanced the overall performance of the catalyst.

关 键 词：完全液相法 CuZnAl催化剂 二甲醚 丙醇锌 硝酸锌 

分 类 号：O643.3[理学—物理化学] TQ426[理学—化学]