石油学报(石油加工) ›› 2018, Vol. 34 ›› Issue (6): 1057-1066.doi: 10.3969/j.issn.1001-8719.2018.06.001

• 研究报告 •    下一篇

分子筛孔结构对轻烃催化裂解性能的影响

韩蕾,欧阳颖,罗一斌,达志坚   

  1. 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

  • 收稿日期:2017-09-22 修回日期:2018-04-23 出版日期:2018-11-25 发布日期:2019-01-18
  • 通讯作者: 达志坚,男,教授级高级工程师,博士,从事催化新材料与反应工程的集成研究;E-mail:dazhijian.ripp@sinopec.com E-mail:675932303@qq.com
  • 作者简介:第一作者:韩蕾,女,博士,从事炼油催化材料方面的基础研究;Tel:010-82368913; E-mail:han-lei.ripp@sinopec.com
  • 基金资助:

    中国石油化工股份有限公司项目(ST114134)资助

Effects of Pore Structure on the Catalytic Performance of ZSM-5 Zeolite in Light Hydrocarbons Cracking

HAN Lei, OUYANG Ying, LUO Yibin, DA Zhijian   

  1. State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China
  • Received:2017-09-22 Revised:2018-04-23 Online:2018-11-25 Published:2019-01-18

摘要: 采用无机碱处理脱硅方法制备了具有不同孔结构的ZSM-5分子筛,通过X射线衍射(XRD)、透射电镜(TEM)、氨气程序升温脱附(NH3-TPD)、吡啶红外吸附(Py-FTIR)、N2吸附/脱附对分子筛进行了表征,将其应用于轻烃催化裂解反应考察其性能差异。结果表明,碱处理脱硅制备的微孔-介孔分子筛结合了微孔的催化性能、择形选择性和介孔的优异扩散性能。对于目的产物是低碳烯烃的烃类催化裂解反应而言,同时具有适宜微孔和介孔孔分布的分子筛体现出更优异的催化性能。同碳数的直链烷烃正辛烷和环烷烃乙基环己烷,虽然其分子结构不同,但在具有更短扩散路径和更大外表面积的4#-ZSM-5分子筛上,正辛烷和乙基环己烷催化裂解均表现出更高的反应活性稳定性和低碳烯烃产物选择性;在相同孔结构分子筛条件下,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。

关键词: ZSM-5, 孔结构;轻烃;催化裂解;低碳烯烃

Abstract: ZSM5 zeolites with different pore structures were prepared by alkali-treatment. Various ZSM-5 zeolites were characterized by means of XRD,TEM,NH3-TPD,Py-FTIR and N2 physicaladsorption/desorption, and the catalytic performances of these zeolites in light hydrocarbons cracking were investigated. It is found that the mesomicroporous ZSM-5 zeolites prepared through desilication showed great catalytic performance, shape selectivity of micropore and outstanding diffusion performance. Due to light olefins acting as objective products in hydrocarbon catalytic cracking, the ZSM-5 with suitable micropore and mesopore distribution shows superior catalytic property. It is confirmed that short diffusion path and large surface area are in favor of relatively high reactivity, stability and light olefin selectivity in the catalytic cracking of C8 hydrocarbons, such as octane and ethylcyclohexan, although their molecular structures are different. With the same pore structure, the total reactivity of ethylcyclohexane is lower than that of octane.

Key words: ZSM-5, proe structure, light hydrocarbon, catalytic cracking, light olefins