Abstract：The hydrogenation performance of N-ethylcarbazole over untreated and Fluorine-treated LaNi5 alloy was investigated experimentally and the hydrogen absorption reaction process was analyzed. The results revealed that the catalytic effect of fluorinated LaNi5 alloy was greatly improved compared with that of untreated one. The morphology of LaNi5 alloy was characterized with scanning electron microscope (SEM). The results showed that numerous fine microcrystals (100 nm) were formed on the surface of fluorinated LaNi5. The unique surface structure consisting of LaF3 protective layer and Ni-rich sub-layer improved the catalytic activity of LaNi5. Further investigation on the catalytic hydrogenation of N-ethylcarbazole over fluorinated LaNi5 alloy indicated that the hydrogen absorption performance was significantly affected by the reaction temperature, and the active temperature was found to be in 443-463 K. In addition, increasing the hydrogen pressure favored the hydrogenation of N-ethylcarbazole. Hydrogen absorption capacity of N-ethylcarbazole reached 0.027 mol/g under the optimal conditions of 6.0 MPa, 443K, 1.0 g fluorinated LaNi5 and 600 r/min.
