科研之友
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摘要
The foam structured catalysts of Ni/Al 2 O 3 -SiC were prepared via conventional impregnation (IM) and deposition- precipitation (DP) methods. These catalysts were characterized by means of scanning electron microscopy- energy dispersive spectroscopy (SEM-EDS), X- ray diffraction (XRD), N 2 absorption-desorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and H 2 temperature-programmed reduction (H 2 -TPR). The effect of preparation methods on the distribution, particle size and valence state of the active component Ni, as well as the interaction between Ni and the supporter was investigated. Furthermore, the catalytic performance of the catalysts prepared by different methods was evaluated for the liquid-phase hydrogenation of benzaldehyde. Results show that the Ni enrichment occurred on the coating surface of three catalysts prepared via impregnating and then dried in air at 40℃ and 160℃, as well as subjected to vacuum freeze-drying, respectively. The foam catalyst dried at 160℃ showed the most serious enrichment of Ni on the coating surface. Compared with the three impregnated foam catalysts, the catalyst prepared by DP method has a uniform Ni distribution and smaller Ni particles size, leading to its higher catalytic performance for hydrogenation of benzaldehyde.
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