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公开(公告)号:US5484628A
公开(公告)日:1996-01-16
申请号:US291559
申请日:1994-08-16
IPC分类号: C01G49/00 , C09C1/24 , C09C3/06 , C09D5/23 , C09D7/12 , G11B5/706 , G11B5/84 , H01F1/11 , B05D7/00
CPC分类号: G11B5/70657 , C09C1/24 , C09C3/063 , C01P2004/10 , C01P2004/80 , C01P2006/10 , C01P2006/12 , C01P2006/42
摘要: Acicular cobalt-containing magnetic iron oxides having a high coercive force and a core/shell structure and hence low temperature dependence of the coercive force are prepared by a process in which, in a first stage, surface activation is effected by means of iron(II) and cobalt ions under alkaline conditions on the iron oxide core under an inert gas atmosphere and thereafter, in a second stage, an epitactic coating of cobalt ferrite is applied, which coating is formed oxidatively from iron (II) and cobalt (II) hydroxide, likewise under alkaline reaction conditions. The total amount of cobalt ions used for doping remains unchanged compared with the known doped iron oxides or is even smaller. In the second process stage, the achievable coercive force can be controlled by the proportion of air in the gas mixture during the formation of the epitactic coating.
摘要翻译: 通过一种方法制备具有高矫顽力和核/壳结构并因此矫顽力的低温依赖性的针状含钴磁性氧化铁,其中在第一阶段中,通过铁(II)进行表面活化 )和钴离子在碱性条件下在惰性气体气氛下在氧化铁芯上,然后在第二阶段施加钴铁氧体的中空涂层,该涂层由铁(II)和氢氧化钴(II)氧化形成 ,同样在碱性反应条件下。 用于掺杂的钴离子的总量与已知的掺杂的氧化铁相比保持不变,或甚至更小。 在第二工艺阶段,可以通过在形成外延涂层期间气体混合物中的空气比例来控制可实现的矫顽力。
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公开(公告)号:US4492804A
公开(公告)日:1985-01-08
申请号:US524318
申请日:1983-08-18
申请人: Gerhard Frank , Peter Rudolf , Gerald Neubauer , Paul Duffner , Manfred Ohlinger , Hans J. Wilfinger , Emil Pfannebecker
发明人: Gerhard Frank , Peter Rudolf , Gerald Neubauer , Paul Duffner , Manfred Ohlinger , Hans J. Wilfinger , Emil Pfannebecker
IPC分类号: C07B61/00 , B01J23/00 , B01J23/745 , C07C67/00 , C07C209/00 , C07C209/48 , C07C211/03 , C07C211/09 , C07C85/12
CPC分类号: C07C209/48 , B01J23/745
摘要: Saturated primary amines are prepared by reacting a nitrile with hydrogen at elevated temperature under superatmospheric pressure in the presence of ammonia and a metallic iron catalyst which has been obtained by reducing anisometric iron oxide particles with hydrogen at not more than 500.degree. C.
摘要翻译: 饱和伯胺通过在氨和一种金属铁催化剂的存在下,在高于大气压的高温下在高温下使氢气与氢气反应来制备,所述金属铁催化剂是通过用不大于500℃的氢气还原不等尺寸的氧化铁颗粒而获得的。
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公开(公告)号:US4521527A
公开(公告)日:1985-06-04
申请号:US524319
申请日:1983-08-18
申请人: Gerhard Frank , Peter Rudolf , Gerald Neubauer , Manfred Ohlinger , Hans J. Wilfinger , Emil Pfannebecker , Paul Duffner
发明人: Gerhard Frank , Peter Rudolf , Gerald Neubauer , Manfred Ohlinger , Hans J. Wilfinger , Emil Pfannebecker , Paul Duffner
IPC分类号: B01J23/745 , B01J37/00 , C07B61/00 , C07C67/00 , C07C209/00 , C07C209/48 , C07C211/09 , B01J23/78 , B01J23/74 , C07C87/14
CPC分类号: B01J23/745 , B01J37/0009 , C07C209/48
摘要: Molded iron catalysts which contain metallic iron particles, obtained from anisometric iron oxide particles by contact with hydrogen at .ltoreq.500.degree. C., and a lubricant, are prepared.
摘要翻译: 制备含有金属铁颗粒的成型铁催化剂,其通过在500℃下与氢气接触的不等尺寸氧化铁颗粒和润滑剂获得。
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