Glucose hydrogenation over Ni-B/SiO2 amorphous alloy catalyst and the promoting effect of metal dopants

被引:102
作者
Li, H [1 ]
Li, HX [1 ]
Deng, JF [1 ]
机构
[1] Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China
基金
中国国家自然科学基金;
关键词
glucose; hydrogenation; Ni-B/SiO2 amorphous catalyst; metal promoters;
D O I
10.1016/S0920-5861(01)00530-2
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The Ni-B/SiO2 amorphous catalyst was prepared by chemical reduction with KBH4 aqueous solution. The amorphous structure was verified by XRD, EXAFS, and DSC. During the liquid phase glucose hydrogenation, the as-prepared Ni-B/SiO2 amorphous catalyst exhibited much higher activity than other Ni-based catalysts, such as the corresponding crystallized Ni-B/SiO2 catalyst, the Ni/SiO2 catalyst obtained by H-2 reduction, and even the commercial Raney Ni catalyst. This was interpreted in terms of both the structural effect and the electronic effect. Effects of the preparation conditions on the activity of the Ni-B/SiO2 amorphous catalyst were investigated which revealed that the maximum activity was achieved by using the 40-60 mesh SiO2 support and calcining the catalyst precursor at 473 K for 2 h. Appropriate concentration of Cr-, Mo-, and W-promoters could further enhance its activity since the presence of these promoters in the low-valent state could act as Lewis adsorption sites which favored the adsorption and polarization of the carbonyl group (C=O) in the glucose molecule. However, large concentration of the promoters led to a decrease in the activity since too many Ni active sites were covered by these oxides. (C) 2002 Elsevier Science B.V All rights reserved.
引用
收藏
页码:53 / 63
页数:11
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