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Epoxidation of Methyl Oleate and Unsaturated Fatty Acid Methyl Esters Obtained from Vegetable Source over Ti-Containing Silica Catalysts
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-11-21 , DOI: 10.1021/acs.iecr.8b04155 Yue Wei 1 , Gang Li 1 , Qiang Lv 1 , Chuanying Cheng 1 , Hongchen Guo 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-11-21 , DOI: 10.1021/acs.iecr.8b04155 Yue Wei 1 , Gang Li 1 , Qiang Lv 1 , Chuanying Cheng 1 , Hongchen Guo 1
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With different oxidants (aqueous H2O2 or cumene hydroperoxide), Ti-containing silica catalysts (hierarchical TS-1, Ti-MCM-41, and Ti-HMS) were applied as catalysts for the epoxidation of methyl oleate (MO) and vegetable-derived unsaturated fatty acid methyl esters (FAMEs). We found that the catalytic performances of titanium silicalites were highly dependent on oxidant types. For the epoxidation of MO over hierarchical TS-1 (HTS-1), aqueous H2O2 is a better oxidant compared with cumene hydroperoxide (CHP). Benefiting from good molecular accessibility and high activity of Ti sites, combined with high hydrophobicity, ultra-high-yield epoxides were obtained over HTS-1. In contrast, CHP was more favorable for Ti-HMS catalyst, which was beneficial to selective conversion of MO into epoxide under solvent-free conditions. The superior catalytic performance was ascribed to the high surface area and pore volume of Ti-HMS. Furthermore, the corresponding structure–catalytic performance relationships and reusability of various catalysts were discussed in consideration of the effect of oxidants.
中文翻译：
从植物来源获得的含钛二氧化硅催化剂对油酸甲酯和不饱和脂肪酸甲酯的环氧化作用
使用不同的氧化剂（H 2 O 2水溶液或氢过氧化枯烯），将含Ti的二氧化硅催化剂（分层TS-1，Ti-MCM-41和Ti-HMS）用作油酸甲酯（MO）和环己烷的环氧化催化剂。植物来源的不饱和脂肪酸甲酯（FAME）。我们发现钛硅沸石的催化性能高度依赖于氧化剂类型。对于MO在分层TS-1（HTS-1）上的环氧化，使用H 2 O 2水溶液与氢过氧化枯烯（CHP）相比，它是一种更好的氧化剂。得益于良好的分子可及性和Ti位点的高活性，再加上高疏水性，在HTS-1上获得了超高产率的环氧化物。相反，CHP对Ti-HMS催化剂更有利，这有利于在无溶剂条件下将MO选择性转化为环氧化物。Ti-HMS具有较高的表面积和孔体积，因此具有优异的催化性能。此外，考虑到氧化剂的影响，讨论了各种催化剂的相应的结构-催化性能关系和可重复使用性。
更新日期：2018-11-24
中文翻译：
从植物来源获得的含钛二氧化硅催化剂对油酸甲酯和不饱和脂肪酸甲酯的环氧化作用
使用不同的氧化剂（H 2 O 2水溶液或氢过氧化枯烯），将含Ti的二氧化硅催化剂（分层TS-1，Ti-MCM-41和Ti-HMS）用作油酸甲酯（MO）和环己烷的环氧化催化剂。植物来源的不饱和脂肪酸甲酯（FAME）。我们发现钛硅沸石的催化性能高度依赖于氧化剂类型。对于MO在分层TS-1（HTS-1）上的环氧化，使用H 2 O 2水溶液与氢过氧化枯烯（CHP）相比，它是一种更好的氧化剂。得益于良好的分子可及性和Ti位点的高活性，再加上高疏水性，在HTS-1上获得了超高产率的环氧化物。相反，CHP对Ti-HMS催化剂更有利，这有利于在无溶剂条件下将MO选择性转化为环氧化物。Ti-HMS具有较高的表面积和孔体积，因此具有优异的催化性能。此外，考虑到氧化剂的影响，讨论了各种催化剂的相应的结构-催化性能关系和可重复使用性。
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