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Catalytic transesterification using a silica hybrid containing encapsulated polyacrylates
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-09-06 , DOI: 10.1016/j.apcata.2017.09.003
Fernanda Tátia Cruz , Dilson Cardoso

The CTA-MCM-41 silica hybrid contains basic sites due to the presence of siloxy anions (SiO) associated with CTA cations. A problem is that this material progressively loses its catalytic activity during successive reuse in transesterification reactions. The challenge of the present work was therefore to stabilize the catalytic activity of this silica hybrid by means of the encapsulation of polymers, using an initial emulsification step in the synthesis. Samples of monomers and polymers emulsified in colloidal solution were characterized using small angle X-ray scattering (SAXS), which confirmed their presence in the interior of the micelles. The solids were analyzed by X-ray diffraction, elemental analysis (CHN), infrared absorption spectroscopy, and thermogravimetry. The findings confirmed the presence of monomers and polymers in the channels of the CTA-MCM-41, and the polymers acted to increase the stability of these new materials during catalytic transesterification.



中文翻译:

使用包含封装聚丙烯酸酯的二氧化硅杂化剂进行催化酯交换反应

该CTA-MCM-41二氧化硅杂化含有由于甲硅烷氧基阴离子的存在(碱性位点的SiO -)与CTA阳离子相关。问题在于该材料在酯交换反应的连续再利用期间逐渐失去其催化活性。因此,当前工作的挑战是在合成过程中使用初始乳化步骤,通过聚合物的包封来稳定该二氧化硅杂化物的催化活性。使用小角度X射线散射(SAXS)对在胶体溶液中乳化的单体和聚合物样品进行表征,这证实了它们在胶束内部的存在。通过X射线衍射,元素分析(CHN),红外吸收光谱和热重分析法分析固体。这些发现证实了CTA-MCM-41通道中存在单体和聚合物,

更新日期:2017-09-06
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