摘要
以聚乙二醇-聚丙三醇-聚乙二醇为模板剂、正硅酸乙酯为硅源,在强酸和水热条件下合成了SBA-15介孔分子筛,用氯丙基三甲氧基硅烷和乙二胺对分子筛进行乙二胺丙基功能化。运用X射线衍射、傅里叶红外光谱、N2吸附-脱附等手段对功能化前后的SBA-15介孔分子筛进行了表征。以苯甲醛与乙酰乙酸乙酯的Knoevenagel缩合为模型反应,研究了功能化后的SBA-15介孔分子筛的碱催化性能。实验结果表明,功能化后的SBA-15介孔分子筛对反应具有催化活性,同时反应温度、反应时间、溶剂和活性组分的负载量等条件对SBA-15介孔分子筛的催化活性都有影响。催化活性随着催化剂活性组分负载量的增加而提高,但存在一个最佳值。当达到最佳负载量即硅烷偶联剂与SBA-15介孔分子筛的质量比为5∶1时,以乙醇为溶剂在80℃下反应90m in,苯甲醛的转化率,最大达到29.2%。
SBA -15 mesoporous molecular sieves were synthesized by hydrothermal method with polyglycol - polypropanetriol- polyglycol （P123）as template and tetraethyl orthosilicate as silica source, and successively functionalized with 3 - chloropropyl - trimethoxysilane and ethylenediamine. SBA - 15 mesoporous molecular sieves were characterized by means of XRD, PTIR, N2 adsorption - desorption before and after functionalization. Activity of catalyst was studied by using knoevenagel condensation of benzaldehyde and acetacetic ester as model reaction. Functionalized SBA - 15 was an effective catalyst for this reaction. Activity of the functionalized SBA - 15 was affected by reaction temperature, reaction time, type of solvent, and loading amount of basic active component. Activity of functionalized SBA - 15 increased with increasing of basic active component loading amount. Under optimal conditions： reaction temperature 80 ℃, reaction time 90 min, ethanol as solvent and m（ chloropropyl - trimethoxysilane） ： m（ SBA - 15 ） = 5 ： 1, conversion of benzaldehyde could reach 29.2%.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2005年第11期1086-1090,共5页
Petrochemical Technology
基金
浙江省自然科学基金项目(202131)
关键词
SBA-15介孔分子筛
催化剂
乙二胺丙基
苯甲醛
乙酰乙酸乙酯
缩合
SBA - 15 mesoporous molecular sieve
catalyst
ethylenediamine - propyl
benzaldehyde
acetacetic ester
condensation
