改性中孔分子筛MCM-41催化合成丙酸香叶酯

用H2SO4对中孔分子筛MCM（mobile crystalline material）-41进行改性,得到SO42–修饰的中孔分子筛SO42–/MCM-41。通过X射线衍射、红外光谱、NH3程序升温脱附和N2吸附–脱附等方法对所合成样品进行表征。用SO42–/MCM-41催化合成丙酸香叶酯,考察了催化剂处理方法、催化剂用量、催化剂再生对香叶醇酯化反应结果的影响,并比较了H2SO4、MCM-41和SO42–/MCM-41这3种催化剂对合成丙酸香叶酯的催化性能。结果表明：用浓度为0.50mol/L的硫酸浸泡MCM-41中孔分子筛1h,再于450℃焙烧3.0h,能得到良好长程有序性和结晶度的中孔分子筛SO42–/MCM-41,用其催化合成丙酸香叶酯,香叶醇的转化率最高可达88.82%,丙酸香叶酯的选择性为85.20%;H2SO4改性对MCM-41中孔分子筛结构影响不明显,但可提高其酸性。

Modified MCM-41 as Catalyst for Synthesis of Geranyl Propionate

SO42– /mobile crystalline material (MCM-41) was prepared via the modification of MCM-41 with H2SO4 . Its structure was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), NH 3 -temperature programmed desorption (NH 3 -TPD) and N 2 adsorption-desorption, respectively. The geranyl propionate (GP) was synthesized. Using SO42– /MCM-41 as a catalyst. The effects of amount and regeneration of the catalyst on the reaction results were investigated. H2SO4 , MCM-41 and SO42– /MCM-41 were used as a catalyst for the synthesis of GP, respectively, and their catalytic properties were compared. The results show that the mesoporous molecular sieves SO42– /MCM-41with a long-range order and a good crystallinity can be obtained by dipping the mesoporous molecular sieves MCM-41 with H2SO4 of 0.50 mol/L for 1.0 h and calcining at 450 ℃ for 3.0 h. The conversion could be 88.82% and the selectivity of GP was 85.20% when the modified MCM-41 was used as a catalyst for the esterification of geraniol. The modification effect with H2SO4 on the structure of MCM-41 mesoporous molecular sieves was not obvious, but could improve its acidity.