Preparation of nickel-tungsten bimetallic carbide catalysts

被引:58
|
作者
Xiao, TC [1 ]
Wang, HT [1 ]
York, APE [1 ]
Williams, VC [1 ]
Green, MLH [1 ]
机构
[1] Univ Oxford, Inorgan Chem Lab, Wolfson Catalysis Ctr, Oxford OX1 3QR, England
关键词
D O I
10.1006/jcat.2002.3651
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A series of nickel and tungsten bimetallic oxides have been prepared using the solid state reaction of nickel nitrate and tungsten trioxide, which were carburised under temperature-programmed conditions with a mixture of 20% CH4/H-2 and 10% C2H6/H-2 to prepare the corresponding carbides. A GC-MS was employed to monitor the carburisation process, and the resulting oxides and carbides have been characterised with X-ray diffraction (XRD), laser Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). It is shown that a greater proportion of nickel tungstate is formed at a high nickel-to-tungsten ratio during the solid state reaction. At a Ni/(Ni + W) (molar) ratio of 0.4, the surface is completely covered with NiWO4, although the bulk phase is completely converted to NiWO4 when the Ni/W ratio approaches unity. Carburising the oxide with a mixture of 20% CH4/H-2 or 10% C2H6/H-2 leads to beta-W2C. However, the carbide is formed at a lower carburisation temperature when using 10% C2H6/H-2 instead of 20% CH4/H-2. The nickel metal is either highly dispersed in or occupies the tungsten carbide lattice. After passivation, the surface of the Ni and W carbide is converted into the oxide of NiWO4, although the bulk structure is still that of beta-W2C carbide. The carbon content in the bimetallic carbide decreases and the carbide particle size becomes larger with increasing nickel content. (C) 2002 Elsevier Science (USA).
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页码:318 / 330
页数:13
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