Abstract:

As the demand for crude oil continues growing, the efficient utilization of inferior residue has become an important issue to be addressed. In the present study, two NiMo/Al₂O₃ catalysts (CAT-1 and CAT-2) are prepared using different methods, and their performance in hydrotreating reaction of inferior residue is systematically investigated. CAT-1 exhibits better catalytic performance than CAT-2 in hydrodesulfurization, conradson carbon residue reduction and hydrodemetalization reactions, with improvements of 10.33%, 8.94% and 1.05% respectively. In addition, CAT-1 also has a residue conversion rate 3.46% higher than CAT-2. The superior catalytic performance of CAT-1 is closely related to its high hydroxyl content. More hydroxyl groups weaken the interaction between support and metal species, which makes it easier to reduce Mo⁶⁺ to Mo⁴⁺, resulting in the formation of Type Ⅱ active phases with a higher degree of sulfurization and higher hydrogenation activity. The increase in hydroxyl content also provides more active sites for hydrogenation reaction and effectively improves dispersion of metal species, the acidity of catalyst and the redox properties of metal species. The present study provides theoretical basis and technical support for the efficient conversion of residue.

Key words: catalyst, hydrogenation, residua, alumina, hydroxyl

摘要：

原油需求持续增长，如何高效利用劣质渣油已成为亟待解决的重要问题。本文利用不同工艺构筑了两种NiMo/Al₂O₃催化剂（CAT-1与CAT-2），并系统研究了其在劣质渣油加氢反应中的催化性能。CAT-1在脱硫、脱残炭和脱金属等反应中表现出优于CAT-2的催化性能，催化性能分别较CAT-2提高了10.33%、8.94%和1.05%，且CAT-1的渣油转化率比CAT-2高出3.46%。CAT-1优异的催化性能与其更高的羟基含量密切相关。更多的羟基减弱了载体与金属物种之间的相互作用，使得Mo⁶⁺更容易还原为Mo⁴⁺，从而形成硫化程度更高、加氢活性更强的Type Ⅱ型活性相；羟基含量的增加也为加氢反应提供了更多的活性位点，并有效提升了金属物种的分散度，进而优化了催化剂的酸性和金属物种的氧化还原性。这些是促进催化剂加氢活性提升的主要原因。本研究为渣油高效转化提供了理论依据与技术支持。

关键词: 催化剂, 加氢, 渣油, 氧化铝, 羟基