助剂对Ni-Mo-W非负载型催化剂微观结构及其加氢脱硫性能的影响

摘要

在水热法制备Ni-Mo-W非负载型催化剂过程中一次性加入十二烷基苯磺酸钠(SDBS)助剂,得到Ni-Mo-W-SDBS非负载型催化剂.利用XRD、BET、N2吸附-脱附、NH3-TPD、SEM等手段分析了催化剂的结构和性能,并考察了其加氢脱硫活性.表征结果显示,Ni-Mo-W-SDBS非负载型催化剂的颗粒尺寸较小、金属分散性好、孔隙结构发达、弱酸中心数量多,活性组分分布均匀.SDBS适宜的添加量为30％(基于Mo的物质的量).Ni-Mo-W-SDBS-30％对FCC柴油的脱硫率可达99.8％,所得加氢柴油的残硫量仅为12μg/g,十六烷值可达48.6.%In the process of hydrothermal synthesis of Ni-Mo-W unsupported catalyst,twelve sodium alkylbenzene sulfonate(SDBS) was added at once as assistant to obtain Ni-Mo-W-SDBS unsupported catalyst.The phase structure,textual properties,acidity,and microstructure of unsupported catalysts were characterized by XRD,N2 adsorption-descrption,NH3-TPD and SEM.The results showed that with the introducing of SDBS,unsupported catalysts had more developed pore structure,more numbers of weak acid sites,good microstructure and higher ratio of metal utilization,and the optimum dosage of SDBS was 30％(based on the mole content of Mo).The desulfurization rate of FCC diesel on Ni-Mo-W-SDBS-30％ could be up to 99.8％.The sulfur content of hydrogenation diesel was only 12 μg/g and the cetane number was 48.6.