| 晶化时间对Cs-La/SBA-15催化丙酸甲酯与甲醛缩合反应的影响 |
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| 作者姓名： | 王亚男 闫瑞一 李增喜 |
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| 作者单位： | 1. 中国科学院大学化学与化工学院, 北京 100049;
2. 中国科学院过程工程研究所多相复杂系统国家重点实验室, 北京 100190 |
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| 基金项目： | 国家自然科学基金（21406244，21276267）资助 |
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| 摘 要： | 丙酸甲酯（MP）和甲醛（FA）缩合反应制备甲基丙烯酸甲酯（MMA）是一条绿色可持续的生产MMA的工艺路线，该路线的关键是开发高效的催化剂，而载体的性质直接影响着催化剂的性能.采用水热合成法制备晶化时间不同的SBA-15，用等体积浸渍法制备负载型的Cs-La/SBA-15催化剂.利用XRD、SEM、IR、BET和TPD等手段对载体和催化剂进行表征，并评价相应的催化剂活性.结果表明，当晶化时间为24 h时，由于载体具有稳定的孔结构（孔径为6 nm左右）和大的比表面积（1 000 m2/g左右），且催化剂表面的中等强度碱性活性位的数量较多，导致催化剂的活性最好.当原料配比为MP/FA=1/1时，反应转化率达到30.9%，选择性达到90.3%.
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| 关 键 词： | 晶化时间 催化剂 羟醛缩合 |
| 收稿时间： | 2016-02-02 |
Effects of crystallization time on the catalysis of Cs-La/SBA-15 for aldol condensation of methyl propionate and formaldehyde |
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| Authors: | WANG Yanan YAN Ruiyi LI Zengxi |
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| Institution: | 1. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Aldol condensation of methyl propionate (MP) and formaldehyde (FA) is a green and sustainable route to synthesize methyl methacrylate (MMA). The key to the route is to develop effective catalysts, and the supports of catalysts play an important role in the catalytic performance. SBA-15 with different crystallization time was synthesized by the hydrothermal method and the Cs-La/SBA-15 catalysts were prepared by wetness impregnation method. The catalysts were characterized by XRD, SEM, IR, BET, TPD, etc. The effect of crystallization time of SBA-15 on the catalytic performance of Cs-La/SBA-15 for aldol condensation was studied. The results showed that regular mesoporous materials with 2D-hexogonal rod-like structure were obtained when the crystallization time was more than 24 h. The Cs-La/24SBA-15 (with SBA-15 crystallized 24 h) exhibited higher catalytic activity than the other catalysts because of the higher density of medium base sites as well as the great surface area of SBA-15 (around 1 000 m2/g) and uniform pore size (6 nm). When the MP/FA=1/1, the conversion of MP is 30.9% and the selectivity of MMA reachs 90.3%. |
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| Keywords: | crystallization time catalysts aldol condensation |
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