铁基沸腾床渣油加氢脱硫催化剂研究

Study on Iron-based Ebullated-bed Residue Hydrodesulfurization Catalyst

制备了具有相同活性金属质量分数的铁基和非铁基沸腾床渣油加氢脱硫催化剂。通过BET、XRD、Raman、H_(2)-TPR、CO吸附原位红外和吡啶红外技术对催化剂进行表征,并采用模型化合物和减压渣油考察了催化剂的加氢脱硫反应机理和加氢活性。结果表明:催化剂的加氢脱硫反应按照直接脱硫反应路径进行,铁基催化剂表现出更高的渣油加氢脱硫、加氢脱残炭和加氢脱金属活性。这是由于铁的加入,增加了催化剂的红外酸量和MoS_(2)活性物种数量,提高了活性金属的利用率,在活性金属质量分数相当的情况下,使催化剂具有更高的加氢活性。

Iron-based and non-iron-based ebullated-bed residue hydrodesulfurization catalysts with same active metal content were prepared. The catalysts were characterized by BET, XRD, Raman, H_(2)-TPR, in-situ FTIR of CO adsorption and Pyridine-IR. The hydrodesulfurization mechanism and hydrogenation activity of the catalysts were investigated by using model compound and vacuum residue. The results indicated that hydrodesulfurization reaction was carried out according to the direct desulfurization reaction path. In addition, the iron-based catalyst showed higher activity in hydrodesulfurization, residual carbon removal and hydrodemetallization. The addition of iron increased the infrared acid content and MoS_(2) active species of the catalyst, and improved the utility ratio of active metal. Furthermore, the addition of iron made the catalyst have higher hydrogenation activity under the same active metal content.