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首页> 外文期刊>Catalysis science & technology >Catalytic olefin epoxidation over cobalt(n)-containing mesoporous silica by molecular oxygen in dimethylformamide medium
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Catalytic olefin epoxidation over cobalt(n)-containing mesoporous silica by molecular oxygen in dimethylformamide medium

机译:在二甲基甲酰胺培养基中通过分子氧含钴(N)含钴(N)的催化烯烃环氧化(N)

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摘要

A cobalt(n) Schiff base complex has been immobilized onto the surface of Si-MCM-41 to prepare a new catalyst. The amine group-containing organic moiety 3-aminopropyl-triethoxysilane had first been anchored on the surface of Si-MCM-41 via a silicon alkoxide route. Upon condensation with salicyl-aldehyde, the amine group affords a bidentate Schiff-base moiety in the mesoporous matrix, which is subsequently used for anchoring of cobalt(II) centers. The prepared catalyst has been characterized by UV-vis, infrared (IR), EPR spectroscopic and small angle X-ray diffraction (XRD) analyses, and N2 sorption studies. The catalytic activity was tested in epoxidation reactions of olefinic compounds, including sty-rene and allyl alcohol, with molecular oxygen at atmospheric pressure in dimethylformamide medium in the absence of additional sacrificial reductant. The reactions seemed to proceed through a radical formation mechanism. The immobilized catalyst showed good activity and epoxide selectivity in the alkene epoxidation. Notably, the catalyst can be recovered and reused without any loss of activity.
机译:钴(N)Schiff碱络合物已固定在Si-MCM-41的表面上,以制备新的催化剂。含胺基团的有机部分3-氨基丙基三乙氧基硅烷首先通过硅氧化硅氧化硅途径锚定在Si-MCM-41的表面上。与水杨醛凝结后,胺基在中孔基质中提供了一个双齿席夫基部分,随后用于锚定钴(II)中心。制备的催化剂已通过UV-VIS,红外(IR),EPR光谱和小角度X射线衍射(XRD)分析以及N2吸附研究来表征。在没有额外的牺牲还原性的情况下,在二甲基甲酰胺培养基中,在大气压下在大气压下与分子氧在内的烯烃化合物的环氧化反应中测试了催化活性。反应似乎是通过一种自由基形成机制进行的。固定的催化剂在烯烃环氧化中表现出良好的活性和环氧选择性。值得注意的是,催化剂可以回收和重复使用而不会损失任何活动。

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