Okamura, T.; Shimoizaka, J., Science Reports of the Research Institutes, Tohoku University, Series A: Physics, Chemistry, and Metallurgy, 1950, vol. 2, p. 673 - 689
The immobilized copper species on nickel ferrite (NiFe2O4@Cu): a magnetically reusable nanocatalyst for one-pot and quick reductive acetylation of nitroarenes to N-arylacetamides
In this study, a green protocol for synthesis of N-arylacetamides was introduced. Magnetically, nanoparticles of the immobilized copper species on nickel ferrite, NiFe2O4@Cu, were synthesized and then characterized using SEM, EDX, XRD, VSM, ICP-OES, BET and XPS analyses. The XPS analysis approved that the immobilized copper species on NiFe2O4 only contain Cu(0) and its oxide form as CuO. The prepared nanocomposite system represented a perfect catalytic activity toward one-pot and quick reductive acetylation of various nitroarenes to the corresponding N-arylacetamides. All reactions were carried out in a mixture of H2O–EtOH (1.5–0.5) within 2–10 min using the combination system of NaBH4 and Ac2O in a one-pot approach and via a two-step procedure. The utilized Cu nanocomposite was magnetically separated from the reaction mixture and reused for 5 consecutive cycles without the significant loss of its catalytic activity.
Room temperature complete reduction of nitroarenes over a novel Cu/SiO<sub>2</sub>@NiFe<sub>2</sub>O<sub>4</sub> nano-catalyst in an aqueous medium – a kinetic and mechanistic study
作者:Mira V. Parmekar、A. V. Salker
DOI:10.1039/c6ra21942j
日期:——
The current investigation reports the preparation of a novel system, Cu/SiO2@NiFe2O4, as characterised by XRD, XPS, IR, SEM-EDS, TEM, ICP-AES and VSM data.
Synthesis, characterization and first application of keggin-type heteropoly acids supported on silica coated NiFe<sub>2</sub>O<sub>4</sub>as novel magnetically catalysts for the synthesis of tetrahydropyridines
作者:Hossein Eshghi、Amir Khojastehnezhad、Farid Moeinpour、Mehdi Bakavoli、Seyed Mohammad Seyedi、Mohsen Abbasi
DOI:10.1039/c4ra05133e
日期:——
In this study, two heteroploly acids with Keggin structures (phosphotungestic acid (PWA) and phosphomolybdic acid (PMA)) have been supported on silica coated nickel ferrite nanoparticles (NiFe2O4@SiO2). The synthesized catalysts were characterized by several methods (FT-IR, SEM, TEM, VSM, XRD, BET and ICP-AES), and the catalytic activities of these new and magnetic catalysts in synthesis of tetrahydropyridine derivatives have been investigated. These new catalysts showed that they can carry out reactions at room temperature in a short time and under solvent-free conditions. Moreover, the obtained results indicated that PWA supported NiFe2O4@SiO2 is a stronger acid than PMA to run these reactions. More importantly, the catalysts were easily isolated from the reaction mixture by a magnetic bar and reused at least five times without significant degradation in their activities.
Tri- and tetranuclear heteropivalate complexes with core {Fe2Ni O} (x = 1, 2): Synthesis, structure, magnetic and thermal properties
作者:Irina A. Lutsenko、Mikhail A. Kiskin、Yulia V. Nelyubina、Nikolay N. Efimov、Yurii V. Maksimov、Vladimir K. Imshennik、Ekaterina M. Zueva、Alexander S. Goloveshkin、Andrey V. Khoroshilov、Eva Rentschler、Aleksey A. Sidorov、Igor L. Eremenko
DOI:10.1016/j.poly.2018.12.018
日期:2019.2
Abstract The reactions of complex [Fe2Ni(O)(Piv)6(Et2O)(H2O)2] (1) with 1,10-phenanthroline (phen) and 2,2′-bipyridine (bpy) gave the following new coordination compounds: the trinuclear complex [Fe2Ni(O)(Piv)6(phen)H2O]·(C2H5)2O (2), the tetranuclear ones [Fe2Ni2(OH)2(Piv)8(phen)2] (3) and [Fe2Ni2(OH)2(Piv)8(bpy)2] (4), depending on the crystallization conditions. According to singlecrystal X-ray diffraction
Enhanced Oxygenates Formation in the Fischer–Tropsch Synthesis over Co- and/or Ni-Containing Fe Alloys: Characterization and 2D Gas Chromatographic Product Analysis
作者:Mohamed I. Fadlalla、Sundaram Ganesh Babu、Thulani M. Nyathi、C. J. Kees-Jan Weststrate、Nico Fischer、J. W. Hans Niemantsverdriet、Michael Claeys
DOI:10.1021/acscatal.0c03346
日期:2020.12.18
exposure to MTFT conditions, employing both conventional ex situ and state of the art in situ techniques. The complex product spectrum from the MTFT was analyzed by combining off-line one-dimensional and on-line two-dimensional gas chromatography. The latter was used specifically to investigate the formation of minority species, such as oxygenates, which are often disregarded in literature. In situ XRD
过渡金属合金在多相催化中受到相当大的关注,因为它们有望结合构成金属的有利性能,因此为目标催化剂的设计提供了诱人的途径。本研究涉及铁氧体中的Co和Ni取代基(Fe 3 O 4)结构,用作中温费托合成(MTFT)的催化剂前体,以期预期会提高含氧化合物的选择性。铁氧体是通过共沉淀法合成的,并在暴露于MTFT条件之前和之后进行了详细表征,同时采用了传统的非原位技术和现有的原位技术。通过结合离线一维和在线二维气相色谱分析来自MTFT的复杂产物光谱。后者专门用于研究少数物种的形成,例如含氧化合物,而这在文献中经常被忽略。原位XRD和磁力分析表明,具有钴取代基的铁氧体的还原行为没有明显变化,但是用Ni代替后,还原温度从315°C急剧降低至250°C,最有可能是由于Ni的氢解离活性增加。MTFT中的活性(CO转化率)按Fe≪ CoFe