焙烧温度对Cu/Zn/Al催化剂超临界甲醇中木质素液化的影响

摘要

A series of Cu/Zn/Al based catalysts were prepared by calcination of the Cu/Zn/Al hydrotalcite which was synthesized by the coprecipitation method. The effect of calcination temperature on the catalyst liquefaction activity and stability of lignin in supercritical methanol were investigated. The results indica-ted that hydrotalcite was almost exactly decomposed at 500 ℃ ,the CuO nanoparticles was segregated and stabilized by precipitation of ZnO and ZnAl2 O4 spinel phase. The catalyst calcined at 500 ℃ showed good activity and stability for the repeatability test at the conditions of 340 ℃ ,lignin 80 mg,30 mg catalyst, 4 mL methanol and holding time 3 h.%采用共沉淀法制备类层柱 Cu/ Zn/ Al 水滑石，经焙烧制备 Cu/ Zn/ Al 催化剂。考察了焙烧温度对催化剂在超临界甲醇中木质素催化液化活性及稳定性的影响。结果表明，500℃焙烧时水滑石分解较为完全，析出的 ZnO和 ZnAl2 O4尖晶石相对析出的 CuO 纳米粒子起到良好的隔离和稳定作用；在340℃、80 mg 木质素、30 mg 催化剂、4 mL甲醇反应3 h 条件下进行重复性实验，500℃焙烧催化剂表现出良好的活性和稳定性。