乙二胺四乙酸对NiMo/Al_2O_3催化剂加氢脱氮性能的影响

以氧化铝为载体,Ni和Mo为金属活性组分,添加不同含量乙二胺四乙酸,采用等体积浸渍法制备系列Ni Mo(x)/Al_2O_3(x为乙二胺四乙酸与Ni物质的量比)重质油加氢处理催化剂,考察乙二胺四乙酸加入量对催化剂加氢脱氮性能的影响,并采用N_2物理吸附-脱附、XRD和HRTEM等对催化剂进行表征。结果表明,乙二胺四乙酸的加入增强了金属组分与氧化铝载体间的相互作用,降低了MoS_2活性相的堆垛层数和片层长度,促进了活性相的分散。乙二胺四乙酸与Ni物质的量比为0.5时,MoS_2活性相堆垛层数和片层长度达到良好的结合,对应的催化剂Ni Mo(0.5)/Al_2O_3具有最优的加氢脱氮性能。

Effects of EDTA modification on hydrodenitrogenation performance of Ni-Mo/AAl2O3 catalysts

UsingAl₂O₃ as the support,and Ni and Mo as the metal active components,NiMo(x)/AAl₂O₃ heavy oil hydrodenitrogenation catalysts with different EDTA/Ni molar ratios(x) was prepared by isovolume impregnation method.The effects of EDTA modification on the catalytic hydrodenitrogenation performance of NiMo(x)/Al₂O₃ catalysts were investigated.The catalysts were characterized by means of N₂ physical adsorption-desorption,XRD and HRTEM techniques.The results showed that EDTA increased the interaction between active metals andAl₂O₃ support,and decreased the stacked layers and layer length of MoS₂ active phases,which improved the dispersion of active phases.MoS₂ active phases had ideal stacked layers and dispersity when the molar ratio of EDTA to Ni was 0.5 and NiMo(0.5)/Al₂O₃ catalyst had optimal hydrodenitrogenation performance.