Physicochemical and catalytic properties of iron-promoted Raney-nickel catalysts obtained by mechanical alloying

被引:14
作者
Zeifert, BH
Salmones, J
Hernández, JA
Reynoso, R
Nava, N
Cabañas-Moreno, JG
Aguilar-Ríos, G
机构
[1] Inst Mexicano Petr, STI, Mexico City 07730, DF, Mexico
[2] Inst Politecn Nacl, ESIQIE, Mexico City 07300, DF, Mexico
关键词
Raney-nickel; mechanical alloying; leaching; catalysts; hydrogenation;
D O I
10.1023/A:1019097828043
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Raney-type catalysts were prepared by means of a two-step procedure: (i) mechanical alloying of the metals and (ii) alkaline aluminum leaching. Mechanical alloying is a novel alternative related to the synthesis of skeletal Ni catalysts. Catalysts characterization was performed by atomic absorption, X-ray diffraction, electron microscopy, and Mossbauer spectroscopies. Textural studies were also carried out. Binary Al-Ni and ternary Al-Ni-Fe alloys were produced by mechanical alloying from pure metallic powders; in particular, the intermetallic beta-(AlNi) phase was formed with a fine microstructure as a non-equilibrium phase; then, aluminum was selectively removed. After aluminum leaching the beta-(AlNi) phase was transformed into the more stable nickel fcc structure. The effect of iron addition to the Ni-Al catalysts depends on iron concentration and reduction temperature; both parameters determine catalysts composition and activity. This work reports physicochemical properties and benzene hydrogenation activity of these materials, compared with conventional catalysts obtained by melting and leaching.
引用
收藏
页码:161 / 165
页数:5
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