Refining heavy or extra heavy oil is still an important challenge for petroleum chemistry. The research performed in the field of hydroprocessing technologies covers different sides of the domain laying from the reactor and process aspects to heterogeneous catalysts development. Historically, at a large scale of time, the worldwide trend seems to indicate a decline of light conventional crude oil availability, the latest being gradually replaced by heavier non-conventional resources that contain asphaltenes and high concentrations of nitrogen and sulfur compounds. It emphasizes the need for conversion of the heaviest feeds and for improving the corresponding refining catalysts. One point raised here to progress deals with the role of the support (alumina), peculiarly about the role of the nanoporous texture on the accessibility of the feedstock molecules to the active sites. Among these large molecules to be considered, asphaltenes play a major role and are often pointed out to be responsible for the industrial issues: plugging porosity, coking support and metal sulphide active phase, poisoning hydrogenating metal. The macrostructure of asphaltenes is complex, characterized by a multi-scale aggregation behavior, strongly influenced by environmental parameters, as for instance the temperature. We have tried in this contribution to confront the abilities of various monomodal and bimodal alumina supports to let asphaltenes diffuse and adsorb into their porosity. An experimental device dedicated to assess the diffusion and adsorption of carriers has been used. The influence, on the mass transfer and the penetration depth, of various parameters such as temperature, asphaltene concentration of the solution, and alumina porous texture was appraised. It is clearly shown that extrudates requires several days do reach an equilibrium, suggesting a very low diffusion kinetic. The diffusion kinetic can be speed-up using an adapted support, especially with high pore diameter and macroporous pores but even if the extrudates of macroporous support might be likely to adsorb till its chemical saturation, i.e. an asphaltene content equal to 1.4 mg/m² consistent with previous publications for those species. As a consequence, NiMoP-B14 is the best catalyst for all the reactions reaching 50% of gain for HDAsC7 and 40% in HDV. It highlights a clear link is established between catalytic performances and diffusion and could be usefull for designing the best carriers to be used in heavy feed hydrporocessing.

炼制重油或超重油仍然是石油化学领域的重要挑战。加氢处理技术领域的研究涵盖了从反应器和工艺方面到非均相催化剂开发领域的不同方面。从历史上看，在较大的时间范围内，全球趋势似乎表明轻质常规原油的供应量正在下降，最新的原油逐渐被包含沥青质和高浓度氮和硫化合物的较重的非常规资源所取代。它强调需要转化最重的进料和改进相应的精制催化剂。这里提出的要解决的问题是载体（氧化铝）的作用，特别是纳米多孔质感对原料分子接近活性位点的作用。在要考虑的这些大分子中，沥青质起着主要作用，并经常被指出是造成工业问题的原因：堵塞孔隙，焦化载体和金属硫化物活性相，使金属氢化中毒。沥青质的宏观结构很复杂，其特征是多尺度的聚集行为，受到环境参数（例如温度）的强烈影响。我们已经在此贡献中试图克服各种单峰和双峰氧化铝载体使沥青质扩散并吸附到其孔隙中的能力。已经使用了专用于评估载体的扩散和吸附的实验装置。影响，根据传质和渗透深度，评估了各种参数，例如温度，溶液的沥青质浓度和氧化铝多孔质感。清楚地表明，挤出物需要几天才能达到平衡，这表明其扩散动力学非常低。使用合适的载体可以加快扩散动力学，特别是在具有大孔径和大孔孔隙的情况下，但即使大孔载体的挤出物有可能吸附直至其化学饱和，即沥青质含量等于1.4 mg / m²与这些物种的先前出版物一致。因此，NiMoP-B14是所有反应的最佳催化剂，对于HDAsC7而言，增益达到50％，对于HDV而言，达到40％。它强调了在催化性能和扩散之间建立了明确的联系，这对于设计用于重型进料液压加工的最佳载体可能是有用的。