摘要
采用猝冷法制备了不同Mo含量的Ni Mo Al合金 ,经碱处理活化后得到猝冷Ni Mo骨架催化剂 .以ICP ,N2 物理吸附 ,XRD ,H2 TPD等手段对合金及催化剂的物化性质进行了表征 .结果表明 ,随着Mo含量的增加 ,合金中依次出现Ni16Mo10 Al74,MoAl3 物相 ,同时NiAl3 相减少 ,Ni2 Al3 相增加 .Mo的存在使合金中更多的铝被抽提 ,减少了催化剂中残留的Ni2 Al3 物相 ,催化剂的比表面积、平均孔径、孔容和晶粒尺寸均随Mo含量增加而减小 .将催化剂用于 2 乙基蒽醌加氢反应 ,发现Mo加快了反应速率 ,同时抑制了降解产物的产生 .在催化剂中Mo含量达到 2 47wt%时 ,双氧水的得率可达到 10 0 % .结合Ni晶粒大小、表面吸附氢状态、Mo的化学态 ,进一步讨论了Mo对猝冷Ni Mo骨架催化性能的修饰作用 .
A series of rapidly quenched skeletal Ni-Mo catalysts with different Mo contents were prepared by alkali leaching of Ni-Mo-Al alloys derived from the single-roller melt-spinning method. It was revealed that the addition of Mo not only alters the phase compositions of the Ni-Mo-Al alloys, but also has pronounced influence on the physical characters of the leached Ni-Mo catalysts. In liquid phase hydrogenation of 2-ethylanthraquinone, it was found that Mo can accelerate the hydrogenation while depress the formation of the degradation products. The yield of H2O2 reaches as high as ca. 100% at a Mo content of 2.47 wt% in the catalyst. The positive effect of Mo on the catalytic behavior was rationalized in terms of the nickel crystallite size, the population of the surface hydrogen species, and the chemical states of Mo.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2004年第14期1281-1286,J001,共7页
Acta Chimica Sinica
基金
"973"国家重点基础研究发展规划 (No .G2 0 0 0 0 4 80 0 9)
国家自然科学基金 (Nos.2 0 2 0 30 0 4
2 0 0 730 0 8)
上海市自然科学基金 (No .0 2ZA1 4 0 0 6)资助项目
