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Amorphous Ni B/SiO2 catalysts were prepared by chemical reduction of Ni2＋with KBH4.ICP was used to analyze the composition of alloys.XRD,TEM,SAED and HREM were used to examine the structures of samples fresh and after thermal treatment in different atmospheres.The results indicated that the supported NiB has a higher structural stability than ultrafine NiB amorphous alloy.Low temperature pretreatment in hydrogen can reduce nickel oxide on the surface of catalysts.However,treatment in hydrogen is more favorable than in atmosphere and nitrogen for keeping it in stable state.
Amorphous Ni B / SiO2 catalysts were prepared by chemical reduction of Ni2 + with KBH4.ICP was used to analyze the composition of alloys. XRD, TEM, SAED and HREM were used to examine the structures of samples fresh and after thermal treatment in different atmospheres. results indicated that the supported NiB has a higher structural stability than ultrafine NiB amorphous alloy. Low temperature pretreatment in hydrogen can reduce nickel oxide on the surface of catalysts.However, treatment in hydrogen is more favorable than in atmosphere and nitrogen for keeping it in stable state.