苯和噻吩在重油流化催化裂化催化剂及其活性组分上的吸附

利用智能重量分析仪测试了在30℃与400℃下苯和噻吩在重油流化催化裂化(RFCC)催化剂及其主活性分子筛组分上的吸附-脱附曲线和程序升温脱附曲线,并将其与催化裂化过程中的原位降硫性能进行了关联。结果表明,噻吩在RFCC催化剂上不仅存在着物理吸附和化学吸附,还会发生低聚反应;苯与RFCC催化剂间的作用力较弱,只存在1种吸附位,400℃下苯在RFCC催化剂上以扩散过程为主,这样可减少汽油因深度裂化而造成的辛烷值损失,提高RFCC催化剂对目标产物的选择性和耐结焦性能;噻吩在RFCC催化剂上的饱和吸附量远大于苯,说明RFCC催化剂对噻吩类硫化物的吸附选择性较好。

Adsorption of benzene and thiophene on resid fluid catalytic cracking catalyst and its active component

The adsorption desorption isotherms and temperature - programmed desorption curves of benzene and thiophene on resid fluid catalytic cracking （RFCC） catalyst and its main active ingredient of zeolite were determined by intelligent gravimetric analyzer （IGA） at 30 ℃ and 400 ℃ and associated with the in site sulfur reduction performance in cata- lytic cracking process . The results indicated that there were not only two kinds of adsorption i. e. physical adsorption and chemical adsorption, but also an oligomerization occurred in the adsorption process of thiophene on RFCC catalyst and its active component. Adsorption capacity of thiophene was fargreater than that of benzene, indicating that RFCC catalyst had better adsorption selectivity of thiophene sulfides. The interaction between benzene and RFCC catalyst was weak for there was only one species of adsorption site, and at 400 ℃ , the diffusion process was dominant in the adsorption of benzene on RFCC catalysts, thus the loss of octane number of gasoline owing to deep cracking could be decreased, and the target product selectivity and coking resistance of RFCC catalysts could be increased.