Ni/Al2O3-SiO2催化剂对C4单烯烃加氢的催化性能

Ni /Al2O3SiO2 catalyst for hydrogenation of C4 fraction was characterized by XRD, H2TPR and pore structure analysis. The hydrogenation conditions and catalytic stability were examined in a fixedbed reactor and the hydrogenation mechanism of catalyst was also discussed. The H2TPR results indicated that at least two kinds of active centers were produced on the surface of catalyst by reduction of crystallite NiO and commendable disperse NiO, respectively. Compared with other catalysts, the inlet temperature of this catalyst 18.6℃ was far lower than the reported temperature 180℃~200℃. So the Ni /Al2O3SiO2 catalyst is a kind of low temperature hydrogenation catalyst. The conversions of monoolefines in C4 fraction was over 98% at 2.0MPa~2.7MPa when the mass fraction of monoolefines in C4 fraction was 74.85%, the reaction temperature was 15℃~25℃，the volume spacetime velocity was 1.0h－1~2.0h－1 , and the volume ratio of H2 to light C4 was 300~450. With the application of Ni/Al2O3SiO2 catalyst, 342h stability test shows that the catalyst has relatively high activity and excellent stability with promising prospects for industrial application.