CuO/Al-SBA-15催化剂的合成及其对苯酚羟基化反应的催化性能  

Synthesis of CuO / Al-SBA-15 Catalysts and Their Catalytic Performance for Hydroxylation of Phenol

作　　者：刘慧慧[1] 蒋天龙[1] 王艳芹[1] 

机构地区：[1]华东理工大学化学与分子工程学院,上海200237

出　　处：《应用化学》2014年第3期274-278,共5页Chinese Journal of Applied Chemistry

摘　　要：采用不同硅铝比的介孔分子筛(Al-SBA-15)作为载体负载不同量的铜元素作为催化剂(CuO/AlSBA-15),通过小角X射线衍射、氮气吸附脱附等温线表征其结构性质,并以苯酚羟基化的反应为模型反应考察了材料的催化性能。研究发现,高的铜负载量不利于介孔材料结构的保持,在较低的铜负载量(3%)的情况下就可以使苯酚羟基化达到61.2%的高转化率。通过对Al-SBA-15和SBA-15作为载体的催化剂的循环套用分析,发现Al-SBA-15作为载体经过5次套用之后依然保持着57.9%的高转化率,而SBA-15经5次套用后的转化率仅有43.6%。这种结果应该得益于载体中的铝元素增加了材料表面的电荷,使铜离子与载体的相互作用加强,在循环套用中的铜离子在材料表面的分散更均匀。A series of catalysts, mesoporous molecular sieves（A1-SAB-15） supported copper oxide（ CuO/A1- SBA-15 ） with different copper content and Si/A1 mass ratios, was characterized by small X-ray diffraction, N2 adsorption-desorption and the catalytic activity in the phenol hydroxylation reaction. The mesostructure was found to become disordered with the copper content increasing. High catalytic conversion up to 61.2% was achieved with 3% copper. A 57.9% conversion for the phenol hydroxylation with the catalyst supported on AI-SAB-15 is higher than the 43.6% conversion with the catalyst supported on SBA-15 after 5 recycles. This may be attributed to the increased surface charges associated with A1 cations and the resulted uniformly dispersed Cu.

关 键 词：苯酚羟基化 介孔分子筛 CUO A1-SBA-15 

分 类 号：O643[理学—物理化学]