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Effect of catalyst preparation and support composition on hydrodesulfurization of dibenzothiophene and Maya crude oil

机译：催化剂的制备和载体组成对二苯并噻吩和玛雅原油加氢脱硫的影响

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Hydrodesulfurization (HDS) of dibenzothiophene (DBT) was carried out in a batch reactor at 3.3 MPa and 340℃. Sulfided catalysts showed a wide range of activity variation as a function of support composition, which established that sulfided active phases strongly depend on the nature and composition of support. The incorporation of MgO, SiO_2, TiO_2 and ZrO_2 with γ-Al_2O_3 alters the nature of active phase interactions on the support surface. Therefore, these oxides play a structural promoting role to the support contribution and its interaction towards the active metal geometry. Different preparation methods of catalysts were carried out by using different additives during the impregnation. It is demonstrated that co-impregnation method found better activity than sequential impregnation. The urea additive prepared catalyst provides promising activity compared with other chelating agents. An Al_2O_3-B_2O_3 mixed oxide supported catalyst was tested at high pressure with real feed (Maya heavy oil diluted with hydrodesulfurized diesel). The mixed oxide supported catalyst showed rapid deactivation with time-on-stream than the alumina supported catalyst that may be due to an enhancement in acidic sites. The activity results demonstrated that the number of catalytic sites is a combination of support composition, additive, impregnation pH, drying and calcinations of catalysts.
机译：二苯并噻吩（DBT）的加氢脱硫（HDS）在间歇反应器中于3.3 MPa和340℃下进行。硫化的催化剂显示出很大的活性变化，这取决于载体的组成，这表明硫化的活性相在很大程度上取决于载体的性质和组成。 MgO，SiO_2，TiO_2和ZrO_2与γ-Al_2O_3的结合改变了载体表面活性相相互作用的性质。因此，这些氧化物对载体的贡献及其与活性金属几何形状的相互作用起结构性促进作用。在浸渍过程中通过使用不同的添加剂进行了不同的催化剂制备方法。结果表明，共浸渍法比顺序浸渍法具有更好的活性。与其他螯合剂相比，尿素添加剂制备的催化剂提供了有希望的活性。 Al_2O_3-B_2O_3混合氧化物负载型催化剂在实际进料（用加氢脱硫柴油稀释的玛雅重油）的高压下进行了测试。与氧化铝负载的催化剂相比，混合氧化物负载的催化剂显示出随时间流逝的快速失活，这可能是由于酸性位点的增强。活性结果表明，催化部位的数目是载体组成，添加剂，浸渍pH，催化剂干燥和煅烧的组合。

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