NiMo/ZrO2-Al2O3柴油深度加氢脱硫催化剂的研究

以ZrOCl₂·8H₂O和Al₂O₃为原料，采用包覆法制备了一系列不同ZrO₂含量的ZrO₂-Al₂O₃复合载体，并用等体积浸渍法负载活性金属，制备了相应的NiMo/ZrO₂-Al₂O₃加氢脱硫催化剂，以柴油为原料考察了催化剂的加氢脱硫活性，利用XRD、N₂吸附和UV-Vis DRS等技术对催化剂及载体的基本物性进行了表征。结果表明，在催化剂载体中引入适量的ZrO2，保持了Al₂O₃载体的孔道结构，降低了活性金属和载体的相互作用，有利于提高催化剂的柴油加氢脱硫活性，当载体中ZrO₂质量分数为10%时，催化剂表现出最高的催化活性，脱硫率达99.25%，产品中硫低于10 μg·g^－1，满足柴油欧-Ⅳ的硫含量标准。

Study on NiMo/ZrO2-Al2O3 catalysts for ultra deep HDS of diesel

ZrO₂-Al₂O₃ mixed oxides with different ZrO₂ contents were prepared by chemical precipitation method using ZrOCl₂·8H₂O and Al₂O₃ as the starting materials, and the synthesized ZrO₂-Al₂O₃ sampleswere used as the supports for NiMo hydrodesulfurization(HDS) catalysts. The HDS catalysts were characterized by means of XRD, N₂ adsorption and UV Vis DRS. The results indicated that structure of Al₂O₃ ZrO₂ mixed oxides remained the same as that of Al₂O₃, and doping of ZrO₂ into Al₂O₃ decreased the interactionbetween support and active metal ions. ZrO₂-Al₂O₃ supported NiMo catalysts with appropriate ZrO₂ content(10%) exhibited the highest HDS activity, with desulfurization rate of 99.25% and sulfur contents in the exist stream less than 10 μg·g^－1, which met the specification of EURO Ⅳ.