STUDY ON THE INTRINSIC PROPERTIES AND CATALYTIC ACTIVITIES OF RANEY NICKEL CATALYSTS
Zhang, Wen-zhong, Su, Gui-qin, Jiao, Feng-ying,Temure, and Yin, Yuan-qi (Lanzhou Institute of Chemical Physics, Academia Sinica, Lanzhou 730000)
Raney nickel was characterized by means of X-ray diffraction, transmission electron microscope, electron diffraction and energy dispersive spectroscopy. Raney nickel catalysts prepared according to the National Standard Method from Ni-Al alloy with different particle sizes showed different activities for hexanedinitrile hydrogenation. It was found that the lower activity of Raney nickel prepared from the larger Ni-Al alloy particles (80mesh) was due to the formation of several mono-crystal nickels closely around one multi-crystal nickel during NaOH leaching. It was also found that the distortion or deficiency of micro-crystal of Raney nickel was the major reason for its high activity at low temperature.