【摘要】 采用真空骤冷技术制备了 Ni₈₂Ce_0.31P_17.7和 Ni₈₂P₁₈非晶态合金.通过高压氢气中热处理,使其粉化.DSC 研究结果表明加入少量 Ce 使 Ni-P 非晶态合金晶化温度提高160℃.用高压反应釜考察了氧化温度和氢还原温度对 Ni-Ce-P 非晶态合金苯乙烯液相加氢活性的影响,并对比了 Ni-P 和 Ni-Ce-P 的加氢活性.活性测试的结果表明:氧化、还原处理过程使 Ni-Ce-P 加氢活性显著增加,最佳的预处理条件是240℃氧化1h,300℃氢气还原2h;Ni-Ce-P 加氢活性是 Ni-P 加氢活性的3—4倍.用 AES 和 XPS 研究了氧化、还原过程中,Ni-Ce-P 表面性质的变化.更多还原

【Abstract】 Amorphous Ni_82.0Ce_0.31P_17.7 and Ni₈₂P₁₈ alloys in the form of ca.5 mm wide and10—20μm thick ribbon were prepared by vacumm rapid quenching method.DSCresults indicated that amorphous Ni-P alloy start to crystallized at 360℃.With theaddition a small amount of Ce to Ni-P amorphous alloy,its crystallizing temperatureincreased to 520℃.Liquid-phase hydrogenation of styrene was selected as probereaction to study the effect of pretreatment condition on the catalytic activities of theamorphous alloy.Their hydrogenation activities increased after pretreated with O₂ andH₂,and the best pretreatment condition was to oxidize the amorphous alloy at 240℃ for1h,and then to reduce at 300℃ for 2h.Catalytic activity of Ni-Ce-P amorphous alloywas found to be 3—4 times active as Ni-P amorphous alloy,and catalytic activites ofboth Ni-P and Ni-Ce-P decreased after crystallization.AES and XPS results showedthat the pretreatment with O₂ and H₂ not only increased the concentration of Ni,butalso changed the electronic state of Ni on the Ni-Ce-P surface.更多还原