Amorphous Ni-B/gamma-Al2O3 catalyst prepared in a modified drying approach and its excellent activity in benzene hydrogenation

作者：Li J; Qiao MH; Deng JF^*

来源：Journal of Molecular Catalysis A: Chemical , 2001, 169(1-2): 295-301.

DOI：10.1016/S1381-1169(01)00048-6

• Ni-B/gamma-Al2O3
• amorphous alloy
• high dispersion
• benzene hydrogenation
• preparation

A two-step dying approach was proposed for the preparation of supported amorphous Ni-B/gamma -Al2O3 catalyst. After wetness impregnation of NiCl2 aqueous solution, the catalyst precursor was dried at 343 K first, followed by drying at 383 K before KBH4 reduction (denoted as Ni-B/gamma -Al2O3 (LT)). For comparison, the precursor was directly dried at 383 K and reduced by KBH4 (denoted as Ni-B/gamma -Al2O3 (HT)). Liquid phase hydrogenation of benzene to cyclohexane was employed as the probe reaction. While X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS) and turnover frequency (TOF) revealed no considerable electronic or structural difference between the active components of these two catalysts, scanning electron micrography (SEM), H-2 chemisorption and XPS intensity analysis demonstrated the higher dispersion of active component in the Ni-B/gamma -Al2O3 catalyst prepared by the two-step drying approach, which can account for the superior catalytic performance of Ni-B/gamma -Al2O3 (LT) to Ni-B/gamma -Al2O3 (HT) in benzene hydrogenation.

• 出版日期2001-3-28
• 单位复旦大学