非晶态Ni（Co）－B合金作催化材料的研究

STUDIES ON AMORPHOUS Ni(Co)-B ALLOYS AS CATALYTIC MATERIAL

用化学法制备了非晶态合金催化剂Ｎｉ－Ｂ和Ｎｉ－Ｃｏ－Ｂ。ＩＣＰ方法测得其组成分别为Ｎｉ_（９３）Ｂ_７和Ｎｉ_（７２）Ｃｏ_（２０）Ｂ_８。经ＸＲＤ、ＤＳＣ及ＴＥＭ鉴定所制合金为非晶态。通过考察氧化处理温度对ＣＯ加氢反应的活性及反应稳定性的影响后发现，ＮｉＢ的活性及稳定性均高于ＮｉＣｏＢ。在高真空程序升温脱附及反应装置上研究了Ｈ_２和ＣＯ的反应，认为其反应机理可能为：吸附的ＣＯ解离为表面反应的控制步骤，解离态的Ｃ和原子氧分别与ＣＯ、Ｈ_２等反应生成产物ＣＯ_２、ＣＨ_４和Ｈ_２Ｏ。

The amorphous alloy catalysts Ni-B and Ni-Co-B were prepared by chemical method.Their contents analysed by inductively coupled plasma(ICP)are Ni_(93)b_7 and Ni_(72) Co_(20)B_8 respectively. The amorphous state of Ni-B and Ni-Co-B was verified by XRD、DSC and TEM methods, The catalytic activity、effect of oxy-treated temperature with air and reaction stability for hydrogenation of CO on the amorphous Ni-B and Ni-Co-Balloy catalysts were investigated.It was found that the reaction activity and the stability of Ni-B are higher than those of Ni-Co-B.The surface reaction of CO with H_2 were studied by using temperature programmed desorption method. The reaction mechanism of carbon monoxide hydrogenation seems to be that the dissociation of the adsorbed CO into C and O followed the reaction of C and O with CO or H_2 to form CO_2,CH_4 and H_2O. CO dissociation on the surface is the controlling step.