分别采用介孔MCM-41和SiO_2为载体制备了固载化AlCl_3催化剂,考察了其催化桥式四氢双环戊二烯异构化生成挂式四氢双环戊二烯反应性能.结果表明,180℃时AlCl_3/MCM-41催化剂上挂式四氢双环戊二烯选择性可达95.7%,而在AlCl_3/SiO_2上仅为86.3%.采用N_2吸附-脱附、Hammett指示剂法、吡啶吸附红外光谱和化学分析等方法对催化剂进行了表征.结果表明,AlCl_3/MCM-41催化剂较弱的表面酸性和一维孔结构有利于挂式四氢双环戊二烯的生成.
The catalytic activity of AlCl_3 immobilized on MCM-41 for the isomerization of endo-tricyclodecane to exo-tricyclodecane was compared with that of AlCl_3 immobilized on SiO_2. At 180℃, >95.0% exo-tricyclodecane selectivity was obtained over AlCl_3/MCM-41, whereas this was only 86.3% over AlCl_3/SiO_2. The catalysts were characterized by N_2 adsorption, Hammett titration, Fourier transform infrared spectroscopy, and chemical analysis techniques. The weaker acidity and smaller straight channels of AlCl_3/MCM-41 gave it the higher exo-tricyclodecane selectivity.
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