证明氢化过的LaNi_5具有较高的加氢活性,在低温即能使乙烯加氢,但反应是化学计量的。消耗了氢的LaNi_5的活性重现需要高温。 LaNi_5的催化活性可以通过先充氢,然后经高温处理加以改进。此时观察到催化活性和磁性间有一平行关系,说明催化活性组分是析出的金属镍,并用XPS证明了这一点。这一效果与LaNi_5多次充氢相同。所得催化剂在丁二烯加氢反应中有特殊的选择性。 Hydrogenation of LaNi_5 proved to have high hydrogenation activity, which can hydrogenate ethylene at low temperature, but the reaction is stoichiometric. Reproduction of hydrogen-consuming LaNi_5 requires high temperatures. The catalytic activity of LaNi_5 can be improved by hydrogenating first and then by high temperature treatment. A parallel relationship between the catalytic activity and magnetism was observed at this time, indicating that the catalytically active component was precipitated metallic nickel, as evidenced by XPS. This effect is the same as that of LaNi_5. The resulting catalyst has a special selectivity in butadiene hydrogenation.