介孔分子筛CsxH3-xPW12O40-SBA-15催化合成丙烯酸正丁酯[

采用溶胶-凝胶方法，以P123为模板剂、正硅酸乙酯为硅源，合成出含有杂多酸铯盐的介孔分子筛Cs_xH_3-xPW₁₂O₄₀-SBA-15。XRD表征结果表明，改性后的催化剂具有纯硅SBA-15分子筛晶体结构。将该催化剂用于合成丙烯酸正丁酯，并考察了不同Cs/P物质的量的比对反应活性的影响，其中Cs_2.5H_0.5PW₁₂O₄₀-SBA-15的催化活性最好。采用正交设计方法确定出各因素对反应结果的影响顺序为反应时间＞反应温度＞原料组成＞催化剂用量，确定最佳操作条件为反应温度130 ℃，酸醇物质的量的比1∶1.2，反应时间5　h，催化剂用量为总原料质量的5%(每克的物料催化剂用量为0.05 g)。重复试验表明Cs_2.5H_0.5PW₁₂O₄₀- SBA-15具有良好的稳定性。

Synthesis of butyl acrylate oer mesoporous CsxH3-XPW12O40-SBA-15 molecular sieve

Cs_xH_3-xPW₁₂O₄₀-SBA-15 mesoporous molecular sieve was prepared by sol-gel method using P123 as templating agent and TEOS as silicon source. XRD patterns showed that the structure of Cs_xH_3-xPW₁₂O₄₀-SBA-15 remained perfect crystalline structure of SBA-15 molecular sieve. Influence of different Cs/P molar ratio on esterification over the catalysts was investigated, and Cs_2.5H_0.5PW₁₂O₄₀/SBA-15 exhibited the best activity. Optimum reaction condition was obtained by orthogonal experiments as follows: 130 ℃,n(acrylic acid)∶n(butanol) =1∶1.2; reaction time 5 h,m(catalyst)∶m(reactants) =5%. Cs_xH_3-xPW₁₂O₄₀--SBA-15 showed good stability in repeated tests.