应用化学

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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

刘慧慧*,蒋天龙,王艳芹   

  1. (华东理工大学化学与分子工程学院 上海 200237)
  • 收稿日期:2013-04-26 修回日期:2013-06-05 出版日期:2014-03-10 发布日期:2014-03-10
  • 通讯作者: 刘慧慧,工程师; Tel:021-33610049; E-mail:liuhuihui@ecust.edu.cn; 研究方向:介孔金属氧化物的合成与表征及催化性能研究

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

LIU Huihui*, JIANG Tianlong, WANG Yanqin   

  1. (School of Chemistry and Molecular Engineering,East China University of
    Science and Technology,Shanghai 200237,China)
  • Received:2013-04-26 Revised:2013-06-05 Published:2014-03-10 Online:2014-03-10

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/Al-SBA-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。

Abstract: A series of catalysts, mesoporous molecular sieves(Al-SAB-15) supported copper oxide(CuO/Al-SBA-15) with different copper content and Si/Al 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 Al-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 Al cations and the resulted uniformly dispersed Cu.

Key words: phenol hydroxylation, mesoporous molecular sieves, CuO/Al-SBA-15

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