摘要
介孔分子筛MCM-41依次与3-氯丙基三乙氧基硅烷、环己二胺和三唑醛反应,得到席夫碱修饰的新型介孔分子筛MCM-41催化剂.通过傅里叶变换红外光谱(FTIR)和X射线多晶衍射(XRD)等方法对所得催化剂进行表征.以过氧化氢为氧源,介孔分子筛MCM-41负载的席夫碱为催化剂,研究了α,β-不饱和酮的环氧化反应,考察了金属盐、溶剂、催化剂用量、反应时间等因素对环氧化反应的影响.结果表明,在室温下乙腈溶剂中,α,β-不饱和酮的环氧化反应在短时间内均以很高的产率(高达99%)得到了相应的产物.同时,对催化剂的重复利用进行了研究,发现重复使用四次,仍能以较高产率得到环氧化产物.
The novel mesoporous molecular sieves MCM-41 supported Schiff base was prepared by MCM-41 and Schiff base, which was synthesized by 3-chloropropyltriethoxysilane, 1,2-cyclohexanediamine with 2-phenyl-2H-1,2,3-triazole-4-carbaldehyde. The catalyst was characterized by methods of Fourier transform infrared spectroscopy （FTIR） and X-ray diffraction （XRD）. The epoxidation of a,β-unsaturated ketones catalyzed by MCM-41 supported Schiff base was studied in the presence of H2O2. The reaction conditions such as metal salts, different solvents, reaction temperature, the catalyst amount, and reaction time were investigated. It was found that the epoxidation of a,β-unsaturated ketones was easily obtained in excellent yields （up to 99%） using acetonitrile as the solvent at room temperature in short time. Especially, the heterogeneous catalyst can be reused four times without significant loss of its catalytic activity.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2012年第11期1289-1294,共6页
Acta Chimica Sinica
基金
国家自然科学基金(Nos.20962018
20862015
20562011)资助项目~~
