- Simultaneous characterizing study of the metallic iron-organic coordination compounds by TG-DSC-MS coupling techniques
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In this work, thermogravimetry-differential scanning calorimetry-mass spectrometry (TG-DSC-MS) coupling techniques were used to make a simultaneous characterizing study for the metallic iron-organic coordination compounds formed by iron ions and organic solvent glycol during the sol-gel process of preparing the iron oxide nanometer films. The positive ion mass spectra [Fe(OCH2CH3)3]+(mass to charge (m/z) = 191) and [Fe(OCH2CH2OH)3]+(m/z = 239) of the organic iron coordination compounds were obtained by experimental methods for the first time. Through the comparison analysis with the results of the TG-DSC-MS for the glycol, it can be found that the thermal decomposition temperature for the metallic iron-organic coordination compounds formed with glycol is higher than that of pure glycol. The results in this research work show that the simultaneous TG-DSC-MS coupling techniques can be applied to characterize some of the metallic-organic coordination compounds appeared in the gas state at lower temperature.
- Lu, Chang-Wei,Wang, Qun,Chen, Yun-Xian,Shi, Jian-Lin
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- Alkoxy metal powder as well as preparation method and application thereof
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The invention relates to a preparation method and an application of alkoxy metal powder, which are applied to preparation of an alkoxy metal carrier of an olefin polymerization catalyst. The alkoxy metal carrier comprises the following components: metal halide, sodium alcoholate or potassium alcoholate, or a solvent. The molar ratio of the components for preparing the alkoxy metal compound is as follows: metal halide: sodium alcoholate or potassium alcoholate = 1:(0.001-30); wherein the metal halide is a metal chloride, a metal bromide, a metal fluoride or a metal iodide; the metal is a main group metal, a sub-group metal or a VIII group metal. The catalyst prepared from the carrier is used for preparing an olefin polymerization catalyst, and has the advantages of high catalyst activity, good hydrogen regulation performance, good copolymerization performance, low polymer powder content, low wax content and good particle morphology; the catalyst is used for ethylene homopolymerization,ethylene and alpha-olefin copolymerization or ethylene and polar alkene monomer copolymerization, propylene homopolymerization, propylene and alpha-olefin copolymerization, or propylene and polar alkene monomer copolymerization.
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Paragraph 0073-0074
(2019/12/02)
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- New insights into the mechanism of iron-catalyzed cross-coupling reactions
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The mechanism of the iron-catalyzed cross-coupling of alkyl halides with aryl Grignard reagents is studied by a combination of GC monitoring and DFT calculation. Herein, we investigate two possible reaction pathways, the regular oxidative addition (OA) pathway and the atom transfer (AT) pathway that might occur in the rate-limiting step. The computational studies revealed that the AT pathway requires less energy than the regular OA pathway.
- Bekhradnia, Ahmadreza,Norrby, Per-Ola
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p. 3959 - 3962
(2015/04/27)
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