【摘要】 以含Ni层状双氢氧化合物（Ni-LDH）为结构模板制备了一系列非负载双金属NiMoS和NiWS催化剂。以喹啉为模型含氮化合物评价了催化剂的加氢脱氮（HDN）性能,并通过XRD、N2吸附-脱附、SEM、TPS等手段分别对催化剂进行了表征。表征结果显示,Mo/W组分的引入能够显著降低催化剂的颗粒尺寸,有利于形成更多活性中心;但过量Mo/W组分的存在也会导致催化剂颗粒的聚集,反而不利于活性位点的暴露。实验结果表明,当Mo（W）/Ni摩尔比为0.3时催化剂表现出最高的HDN活性;此外,当Mo（W）/Ni摩尔比超过0.3时,由于对颗粒的分散作用有限,MoS₂/WS₂晶粒的堆积层数有所增加,使得氢解活性位点数目的比例增大,氢解选择性升高。更多还原

【Abstract】 A series of layered unsupported bimetallic NiMoS and NiWS catalysts were prepared by using Ni layered double hydroxides（Ni-LDH） as a structural template. The catalytic performance was evaluated for quinoline hydrodenitrogenation（HDN） performance of catalyst was evaluated by quinoline. The catalysts were characterized by XRD,N₂ adsorption-desorption,SEM and TPS. The characterization results show that the introduction of Mo/W significantly reduce the catalyst particle size,which is conducive to the formation of the catalytic active sites. However,the excessive Mo/W components also lead to an aggregation of the catalyst particles,which is detrimental to the exposure of active sites on the particle surface. The evaluation results show that the catalysts with a Mo（W）/Ni molar ratio of 0.3 exhibit the highest HDN activity. In addition,when the Mo（W）/Ni molar ratio is larger than 0.3,owing to the limited dispersive effect on the catalyst particles,the stacking numbers of MoS₂/WS₂ crystallites also increase with increasing the Mo（W）/Ni molar ratio,resulting in an increase in the ratio of the hydrolysis active sites and the hydrolysis selectivity.更多还原