正己烷在FAU和MFI型分子筛催化剂上的转化途径  

REACTION PATHWAYS OF n-HEXANE OVER FAU AND MFI TYPE ZEOLITE CATALYSTS

作　　者：崔守业[1] 许友好[1] 程从礼[1] 杨轶男[1] 刘守军[1] 

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油学报（石油加工）》2009年第5期625-631,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点基础研究发展规划"973"项目(2006CB202501)资助

摘　　要：以正己烷在分子筛催化剂上的转化途径和各转化产物平均摩尔选择性为基础,建立了正己烷在分子筛催化剂上转化反应的独立反应方程,通过关联独立反应方程和转化产物平均摩尔选择性计算出独立反应的摩尔选择性。结果表明,一旦正己烷的C—C键或C—H键被质子所进攻生成Carboniumion后,该C6Carboniumion随后发生的α异裂的位置更倾向于在靠近链中的位置。正己烷在MFI型、复合FAU型和FAU型分子筛催化剂上的转化反应中,单分子反应的比例分别为75.87%、32.01%和31.46%。正己烷反应产物中的丙烷和丙烯等较大分子的来源不仅是双分子反应,同时还有单分子反应,两者的比例受分子筛催化剂类型的影响。以正己烷和H质子进行验证表明独立反应方程的建立和独立反应摩尔选择性的计算是有效的。Based on the reaction pathways of n-hexane over catalysts and the molar selectivity of products, the independent reaction equations of n-hexane over zeolite catalysts were established. The correlation of independent reaction equations with molar selectivity of products was set up, and the molar selectivity of the independent reactions was calculated. The results showed that the position of a cracking of C6 Carbonium ion was favorable to the middle of carbon chain. The proportion of mono-molecular reactions over catalysts of MFI, MFI＋FAU and FAU type were 75.87%, 32.01% and 31.46%, respectively. The large molecular products, such as propane and propylene, were generated from both mono-molecular and bi-molecular reactions. The ratio of mono-molecular to bi-molecular reactions in n-hexane conversion reaction over zeolite catalysts was related to zeolite type of the catalyst. It was proved by n-hexane and H^＋ that the establishment of independent reaction and the calculation of the molar selectivity for independent reaction were valid.

关 键 词：正己烷 催化反应 分子筛 独立反应 摩尔选择性 

分 类 号：TE624.4[石油与天然气工程—油气加工工程]