REACTIVITIES AND PROPERTIES OF LANTHANIDE CATALYSTS PREPARED BY THERMAL DEGRADATION OF LIQUID AMMONIA SOLUTIONS OF EU OR YB METAL
REACTIVITIES AND PROPERTIES OF LANTHANIDE CATALYSTS PREPARED BY THERMAL DEGRADATION OF LIQUID AMMONIA SOLUTIONS OF EU OR YB METAL
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EU或YB金属液氨溶液热降解制备的镧系元素催化剂的反应活性和性能
DOI：
10.1246/bcsj.69.77
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发表时间：
1996
影响因子：
4
通讯作者：
S. Tsuchiya
中科院分区：
文献类型：
--
作者：
H. Imamura;T. Konishi;E. Suda;Y. Sakata;S. Tsuchiya
用稀土金属Eu或Yb的液氨溶液浸渍活性炭（AC）制备了稀土催化剂（Eu/AC和Yb/AC），并对催化剂的X射线衍射、傅里叶变换红外光谱和催化性能进行了研究。通过热处理，沉积在AC上的镧系元素通过不同的步骤（金属、酰胺、酰亚胺或氮化物）发生变化，同时氢化活性显著变化。Eu/AC和Yb/AC分别在573和773 K附近进行真空处理，即使在203 K下也显示出高活性。研究了分别制备的镧系酰胺（Eu（NH 2）2、Yb（NH 2）2、Yb（NH 2）3）、酰亚胺和氮化物的催化性能。结果表明，在503-573 K和423-773 K温度下，铕（II）和镱（II和III）酰胺热分解生成氮化物时，生成的酰亚胺或类酰亚胺物种分别是Eu/AC和Yb/AC的活性催化剂。
Studies of X-ray diffraction, Fourier-transform infrared spectra and catalytic properties of lanthanide catalysts (Eu/AC and Yb/AC) prepared by impregnation of active carbon (AC) with liquid ammonia solutions of Eu or Yb metal were carried out for the catalytic hydrogenation of ethene. The lanthanides thus deposited on AC were changed through varied steps (metal, amide, imide or nitride) by thermal treatments and simultaneously the hydrogenation activity varied markedly. Eu/AC and Yb/AC which were subjected to the evacuation treatment around 573 and 773 K, respectively, showed a high activity even at 203 K. The catalytic properties of lanthanide amide (Eu(NH2)2, Yb(NH2)2, and Yb(NH2)3) prepared separately, imide and nitride were investigated for comparison. It was concluded that imide or imide-like species formed during the thermal decomposition processes of europium(II) and ytterbium(II and III) amides to nitride at 503—573 and 423—773 K was active catalysts for Eu/AC and Yb/AC, respectively.