表面含磷酸的介孔分子筛P-SBA-15的合成及其性能评价
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摘要: 采用后合成法，将磷酸固载在纯硅介孔分子筛SBA-15表面上。利用X射线衍射（XRD）、红外光谱（IR）、氮气吸附脱咐法（BET）分析方法表征催化剂的物理性能。结果表明，催化剂P-SBA-15在高温焙烧后保持了稳定的介孔分子筛SBA-15结构，该催化剂的比表面积和孔径分别为605.45m2/g和5.576nm（磷硅摩尔比5%）。选用十一碳烯酸与异丙醇的酯化反应对催化剂P-SBA-15的催化反应性能进行评价，同时与其他几种微孔沸石分子筛催化剂催化性能相比表明，磷酸改性的介孔分子筛PSBA15是合成十一烯酸异丙酯较为理想的固体酸催化剂，考察了催化剂的稳定性。Abstract: A wellordered mesoporous material P-SBA-15 functionalized with phosphoric acid group was prepared by postsynthetic method. Characterizations by power X-ray diffraction (XRD), infrared spectroscopy (IR), as well as nitrogen sorption（BET）were carried out to understand the physical properties of P-SBA-15. The results show that the structure of P-SBA-15 remains that of silica mesoporous material SBA-15, and the specific surface area and the mesopore size of P-SBA-15 are 605.45m2/g and 5.576nm ( np/n si =5% for example), respectively. Synthesis of iso-propyl undecylenate over the P-SBA-15 catalysts was studied in order to investigate the catalytic properties of mesoporous molecular sieve P-SBA-15. Compared with liquid acid and microporous zeolite catalysts, the P-SBA-15 is the best one among the solid acids for esterification reaction. Reuse of P-SBA-15 indicated this catalyst has high stability under esterification conditions.
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Key words:
- mesoporous molecular sieve /
- characterization /
- phosphoric acid /
- esterification /
- undecylenic acid
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