改性中孔分子筛MCM-41催化合成丙酸香叶酯  

Modified MCM-41 as Catalyst for Synthesis of Geranyl Propionate

作　　者：唐晓红[1] 

机构地区：[1]河南教育学院化学系,郑州450046

出　　处：《硅酸盐学报》2012年第4期590-594,共5页Journal of The Chinese Ceramic Society

摘　　要：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。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）,NH3-temperature programmed desorption（NH3-TPD） and N2 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.

关 键 词：中孔分子筛 改性 催化剂 丙酸香叶酯 

分 类 号：O643.32[理学—物理化学]