Abstract:

To study the property changes of deactivated catalyst for liquid-phase hydrogenation of diesel and the hydrogenation performance of regenerated catalyst, the physical properties of the deactivated catalyst and regenerated catalyst are characterized by N₂ adsorption-desorption, C-S analysis, XRF, XRD techniques, and the catalytic performance of the regenerated catalyst is investigated by a small-scale evaluation device. The results show that the contents of carbon and sulfur of the deactivated catalyst are 8.37% and 9.45% respectively, the specific surface area and pore volume of the deactivated catalyst decrease, and the pore distribution shifts to the small pores. The carbon content of the regenerated catalyst is reduced to the level of fresh agent, and there is a small amount of sulfur-containing substances that cannot be eliminated by high temperature regeneration. Compared with the fresh catalyst, the pore structure of regenerated catalyst can be recovered to about 80%. The results of activity evaluation show that the activity of deactivated catalyst for diesel hydrofining can be basically recovered after regeneration.

Key words: liquid-phase hydrogenation, deactivated catalyst, S element, C element, pore structure, XRF, XRD

摘要：

为了探究柴油液相加氢失活催化剂的性质变化以及再生后催化剂的加氢性能，通过N₂吸附-脱附、C-S元素分析、XRF和XRD等表征手段对加氢精制失活剂与再生剂进行物理性质分析，并利用小试评价装置考察催化剂再生后催化裂化性能。结果显示：失活催化剂的C元素质量分数为8.37%,S元素质量分数为9.45%,失活剂的比表面积和孔体积均有所降低，且孔分布向小孔方向偏移。再生后的催化剂C元素含量可降至新鲜催化剂水平，有少量的含硫物质不能通过高温再生消除，对比新鲜催化剂孔结构性质有所变化，再生后孔结构可恢复至80%左右。活性评价结果显示：柴油加氢精制失活催化剂再生后的活性能够基本恢复。

关键词: 液相加氢, 失活催化剂, S元素, C元素, 孔结构, XRF, XRD