铜基催化剂结构对烯醛滴流床和固定鼓泡床加氢效果的影响

Effect of copper-based catalyst structure on olefin aldehyde hydrogenation in trickle bed and fixed bubbling bed

采用共沉淀法制备了不同组成的铜硅、铜铬和铜锌复合氧化物催化剂。利用X射线衍射(XRD)、氢气程序升温还原(H2-TPR)、氮气物理吸附(BET)和正丁胺电位滴定法等测试手段对制备的铜基复合氧化物催化剂的物化性质和孔结构进行了表征。考察了3种不同组成的铜基复合氧化物催化剂在滴流床和固定鼓泡床反应器中催化2-丙基-2-庚烯醛加氢的效果。结果表明:3种铜基复合氧化物催化剂的铜晶粒大小、表面酸碱性差异与催化2-丙基-2-庚烯醛加氢性能未呈现任何正向相关关系;具有丰富大孔的催化剂采用固定鼓泡床反应器催化烯醛加氢的效果优于采用滴流床反应器。

Copper-silicon,copper-chromium and copper-zinc composite oxide catalysts with different compositions were prepared by coprecipitation method.The physicochemical properties and pore structure of the copper-based composite oxide catalysts were characterized by X-ray diffraction(XRD),temperature-programmed reduction by H2(H2-TPR),N2 adsorption-desorption(BET)and potentiometric titration with n-butylamine.The hydrogenation of 2-propyl-2-heptenal catalyzed by the three copper-based composite oxide catalysts with different compositions in trickle bed and fixed bubbling bed was investigated.The results showed that there was no positive correlation between the difference of copper crystal size and surface acid content on the three copper-based composite oxide catalysts and the catalytic performance of 2-propyl-2-heptenal hydrogenation.The fixed bubbling bed reactor was better than trickle bed reactor for olefin aldehyde hydrogenation catalyzed by catalysts with abundant macropore.