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不同硅/铝比ZSM-5分子筛对烷烃和环烷烃催化裂解性能的影响
引用本文:韩蕾,欧阳颖,邢恩会,罗一斌,达志坚. 不同硅/铝比ZSM-5分子筛对烷烃和环烷烃催化裂解性能的影响[J]. 石油学报(石油加工), 2018, 34(5): 872-881. DOI: 10.3969/j.issn.1001-8719.2018.05.004
作者姓名:韩蕾  欧阳颖  邢恩会  罗一斌  达志坚
作者单位:中国石化 石油化工科学研究院 石油化工催化材料与反应工程国家重点实验室, 北京 100083
基金项目:中国石油化工股份有限公司项目(ST114134)基金资助
摘    要:以硅/铝摩尔比(n(SiO2)/n(Al2O3)=24的ZSM 5分子筛为母体,通过酸处理脱铝制备了具有不同硅/铝摩尔比(50、85、110、140)的ZSM-5分子筛,通过X射线衍射(XRD)、扫描电镜(SEM)、氨气程序升温脱附(NH3-TPD)、吡啶红外吸附(Py-FTIR)、N2吸附-脱附等手段对其进行表征,考察其应用于正辛烷和乙基环己烷催化裂解反应的性能差异。结果表明,正辛烷和乙基环己烷的转化率与ZSM-5分子筛硅/铝比存在较好的对应关系,即硅/铝比越低、酸量越高,转化率越高;但ZSM-5分子筛硅/铝比低、酸量过多会导致非选择性副反应发生,降低目的产物低碳烯烃收率和选择性。不同硅/铝比ZSM-5分子筛在正辛烷和乙基环己烷催化裂解反应中显示出不同的催化性能,对于相同碳数的烷烃正辛烷和乙基环己烷,由于其分子结构不同,所适宜的硅/铝比不同;在相同硅/铝比分子筛条件下,环烷烃乙基环己烷的总体反应活性低于相对应的直链烷烃正辛烷;正辛烷在ZSM-5-85分子筛上具有更优异的催化裂解反应性能,乙基环己烷在ZSM-5-50分子筛上具有更优异的催化裂解反应性能。

关 键 词:ZSM-5  硅/铝比  轻烃  催化裂解  低碳烯烃  
收稿时间:2017-09-22

Effect of Si/Al Ratio on the Catalytic Performance of ZSM-5 Zeolites in Alkane and Cycloalkane Cracking
HAN Lei,OUYANG Ying,XING Enhui,LUO Yibin,DA Zhijian. Effect of Si/Al Ratio on the Catalytic Performance of ZSM-5 Zeolites in Alkane and Cycloalkane Cracking[J]. Acta Petrolei Sinica (Petroleum Processing Section), 2018, 34(5): 872-881. DOI: 10.3969/j.issn.1001-8719.2018.05.004
Authors:HAN Lei  OUYANG Ying  XING Enhui  LUO Yibin  DA Zhijian
Affiliation:State Key Laboratory of Catalytic Materials and Reaction Engineering,Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China
Abstract:Taking ZSM-5 zeolite  (n(SiO2)/n(Al2O3)=24) as  matrix, the acid-treated ZSM 5 zeolites with different n(SiO2)/n(Al2O3) were prepared by post synthesis treatmentVarious ZSM-5 zeolites were characterized by means of XRD,SEM,NH3-TPD,Py-FTIR and N2 physical adsorption, and their catalytic performances in light hydrocarbons cracking were evaluated. It is found that the conversion of n octane and ethylcyclohexane is in good  relation to the ratio of SiO2/Al2O3. Under lower n(SiO2)/n(Al2O3) the larger amount of acid sites favors the higher conversion. But, when the  n(SiO2)/n(Al2O3) is too low, the  nonselective side reactions are happened,thereby causing the decreasing of light olefins yield and selectivity.  ZSM-5 zeolites with different n(SiO2)/n(Al2O3) show different catalytic performance in hydrocarbon catalytic cracking. With respect to the same carbon number of octane and  ethylcyclohexane,  the appropriate n(SiO2)/n(Al2O3) needed is different,due to the structure difference among various molecules.Under the same  n(SiO2)/n(Al2O3), the total reactivity of  ethylcyclohexane is lower than that of octane.  ZSM-5-85 and  ZSM-5-50 shows the most excellent catalytic performance in the cracking of n-octane and ethylcyclohexane,respectively.
Keywords:ZSM-5  Si/Al ratio  light hydrocarbon  catalytic cracking  light olefins  
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