摘要
以克拉玛依减压蜡油(VGO)为反应体系,对以水溶性分散型催化剂为催化体系的渣油加氢裂化过程外甩催化剂进行了分离和分析,发现单组分催化剂在反应过程中分别是以NiS(Ni7S6)、MoS2和Fe1-xS的形式存在。以二苯甲烷和克拉玛依VGO为模型化合物和反应原料,对钼、镍、铁元素单组分催化剂催化性能的研究结果表明,硫化态金属催化剂产生氢自由基中间体氢化不饱和键的"氢化活性"不同,钼催化剂明显优于镍催化剂,镍催化剂优于铁催化剂;不同催化剂抑制大分子自由基之间缩合生焦的能力也不相同,钼催化剂的抑焦能力最强,镍催化剂次之,铁催化剂的抑焦能力较差。
The catalyst used for the slurry phase hydrocracking of VGO (Vacuum Gas Oil) from Kelamayi, Xinjiang, was separated from the products and analyzed by using XRD and XPS. The crystal structures of the catalysts were identified as NiS(Ni_7S_6), MoS_2 and Fe_(1-x)S. The catalytic performance of molybdenum, nickel and iron was studied respectively for the slurry phase hydrocracking using diphenylmethane as the model compound and VGO from Kelamayi as the reactant. The results showed that, during the slurry phase of heavy oil hydrocracking, the catalyst reacts on the feed stocks and the free-radical intermediate H· is formed on the surface of the catalyst. The free-radical intermediate H· formed on the surface of the catalyst could react with the free-radical of big molecular and restrained the formation of coke during the reaction.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2004年第4期461-465,共5页
Journal of Fuel Chemistry and Technology
