以MCM-41作载体的磷化镍催化剂的加氢脱氮性能

 采用原位还原方法制备了以MCM-41作载体的磷化镍催化剂，并以喹啉作模型化合物考察了其加氢脱氮(HDN)反应性能。结果表明，由MCM-41担载制备的磷化镍催化剂的HDN活性远高于传统的硫化态Ni-W催化剂，最佳Ni/P摩尔比为1.0~1.25。从反应中间体和产物分析结果可以看出，磷化镍催化剂表现出很高的加氢活性，这可能是磷化镍催化剂具有较高脱氮活性的主要原因。当NiO和P₂O₅总担载量低于40%时，催化剂活性随着NiO和P₂O₅总担载量的增加而增加，其最佳担载量为30%。XRD结果表明，Ni₂P与Ni₁₂P₅同为HDN活性相，但Ni₂P活性更高。

HYDRODENITROGENATION PERFORMANCE OF MCM-41-SUPPORTED NICKEL PHOSPHIDES

MCM-41-supported nickel phosphides were prepared by an in-situ-reduction method.Their hydrodenitrogenation(HDN) activities were evaluated by means of 1% quinoline in decalin.It was indicated that the HDN activity of the MCM-41-supported nickel phosphides was much higher than that of the supported Ni-W sulfide.The optimal initial molar ratio of(Ni/P) was 1.0-1.25.It could be concluded from the distribution of the intermediates and the products that high hydrogenation activity of the MCM-41-supported nickel phosphides should be responsible for their high HDN activity.When the total loading of NiO and P_2O_5 was below 40%,the HDN activity of the MCM-41-supported nickel phosphides increased with increasing the total loading of NiO and P_2O_5,and the optimal total loading of NiO and P_2O_5 was 30%.XRD patterns of the high-performance phosphide catalysts suggested that both the Ni_2P and Ni_(12)P_5 were active in the HDN reactions,and Ni_2P was more active.