渣油加氢裂化反应中油溶性催化剂的抑焦性能

Coke restraining ability of oil-soluble catalyst for residue hydrocracking

以辽河常压渣油为研究对象,通过高压釜模拟渣油加氢裂化反应,对不同油溶性催化剂体系反应后的生焦量、生焦状况及产物进行分析,深入研究渣油加氢裂化反应中油溶性催化剂的抑焦性能。研究表明,随着活性金属含量的增大,油溶性单金属Co催化剂和Ni催化剂的生焦量减少,Co-Fe或Ni-Fe复配体系具有协同效应,抑焦性能增强,由生焦状况比较得出的规律与生焦量趋势一致。随着催化剂抑焦活性的增强,加氢裂化反应产物>480℃馏分中沥青质和饱和分组分大致呈增长趋势,而芳香分和胶质逐渐降低。此外,反应产物中催化剂活性金属以硫化态物种存在,在Co-Fe复配催化体系中检测出FeS晶体和Co_8FeS_8混合晶体的衍射峰,Ni-Fe复配催化体系中检测出FeS_2和FeS的衍射峰。

The yield of coke, coke formation status, and products of hydrocracking reaction over oil-solu- ble catalyst systems were analyzed and the coke restraining ability of oil-soluble catalyst for residue hydro- cracking was investigated by using Liaohe atmospheric residue as the study object and simulating residue hydrocracking reaction in the autoclave. The results showed that the yield of coke over single metal Co and Ni oil-soluble catalysts decreased with the increase of active metal contents. Co-Fe and Ni-Fe compounded catalysts exhibited high coke restraining ability due to their synergistic effect. The tendency for the coke formation status was consistent with the amount of coking. Asphaltenes and saturated fraction in 〉 480℃ fractions of hydrocracking products generally showed an increasing tendency, while aromatics and resins gradually reduced with the activity enhancement of restraining coke of the catalyst. In addition, the state of the active metal of the catalyst in the reaction products was sulfide species. The diffraction peaks of FeS crystal and Cos FeSs mixed crystal in Co-Fe catalytic system and FeS and FeS2 in Ni-Fe catalyst system were detected, respectively.