Core-shell structured Fe3O4@SiO2 supported cobalt(II) or copper(II) acetylacetonate complexes: magnetically recoverable nanocatalysts for aerobic epoxidation of styrene

Jian Sun; Guangli Yu; Lulu Liu

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Core-shell structured Fe3O4@SiO2 supported cobalt(II) or copper(II) acetylacetonate complexes: magnetically recoverable nanocatalysts for aerobic epoxidation of styrene

机译：核壳结构化FE3O4@SIO2支持的钴（II）或铜（II）乙酰乙酸酯络合物：可回收的纳米催化剂，用于有氧苯乙烯的有氧氧化

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Organic-inorganic hybrid heterogeneous nanocatalysts were successfully fabricated via covalent anchoring of cobalt(II) or copper(II) acetylacetonate complexes ([Co(acac)2] or [Cu(acac)2D onto core-shell structured Fe3O4@SiO2 previously functionalized with 3-aminopropyltriethoxysilane (APTES). Surface functionalized nanomaterials were analyzed by a series of characterization techniques such as SEM, TEM, XRD, FT-IR, XPS, ICP-AES and VSM. The catalytic performance of the prepared nanocatalysts was evaluated in the epoxidation of styrene using eco-friendly air as the oxygen source. Both of the nanocomposites Fe3O4@SiO2-NH2-Co and Fe3O4@SiO2-NH2-Cu presented excellent styrene conversion (90.8% vs. 86.7%) and good epoxide selectivity (63.7% vs. 51.4%), much higher than the corresponding homogeneous counterparts. In addition, the magnetically recoverable nanocatalysts (MRNCs) can be conveniently separated and recovered from the reaction system by applying an external magnetic field and reused for four cycles with insignificant loss of catalytic activity. These results demonstrate that the heterogeneous nanocatalysts possess potential applications for green and sustainable development.

机译：通过钴（II）或铜（II）乙酰乙酸酯配合物（[CO（ACAC）2]或[CU（ACAC）2]或[CU（ACAC）2D与先前在核心壳结构的Fe3O4@Sio2上与先前功能功能的乙酰乙酸酯络合物（II）或铜（II），有机无机杂化纳米催化剂成功地通过共价锚定（II）或铜（II）乙酰乙酸酯配合物（II）成功制造。通过一系列特征化技术（例如SEM，TEM，TEM，XRD，FT-IR，XPS，ICP-AES和VSM）分析了3-氨基丙基三乙氧基硅烷（APTES）。使用环保空气作为氧气来源的苯乙烯。纳米复合材料Fe3O4@sio2-nh2-co和fe3o4@sio2-nh2-cu呈现出极好的苯乙烯转化率（90.8％vs. 86.7％）和良好的环氧选择性（63.7％）（63.7％） vs. 51.4％），比相应的均质对应物高得多。此外，可以方便地分离并通过施加外部磁场并重新使用了磁性可回收的纳米催化剂（MRNC），并从反应系统中恢复对于四个循环，催化活性丧失。这些结果表明，异质纳米催化剂具有潜在的绿色和可持续发展应用。

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《Catalysis science & technology》 |2014年第5期|1246-1252|共7页
作者
Jian Sun; Guangli Yu; Lulu Liu;
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作者单位

Laboratory of Automobile Materials ofMOE and State Key Laboratory of Superkard Materials, Department of Materials Science, Jilin University, Changchun 130012, PR China;

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China;

College ofChemistry, Jilin University, Changchun, 130023, PR China.;

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正文语种英语
中图分类汉语教学;
关键词
Heterogeneous; Styrenes; exterior magnetic fieldSustainable DevelopmentEpoxidationacetyl acetonateCORE-SHELL;

机译：异质;静脉;

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机译：Dinuclear Cobalt(II) Complexes Containing 1,3-(or 1,5-)Bis[bis(2-pyridylmethyl)amino]-2-propanolato (or -3-pentanolato): preparation and Reaction with molecular Oxygen

Core-shell structured Fe3O4@SiO2 supported cobalt(II) or copper(II) acetylacetonate complexes: magnetically recoverable nanocatalysts for aerobic epoxidation of styrene

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