化工学报 ›› 2023, Vol. 74 ›› Issue (1): 438-448.DOI: 10.11949/0438-1157.20221200

• 催化、动力学与反应器 • 上一篇    下一篇

ZSM-5分子筛酸性能和孔结构的协同作用对C5烯烃催化裂解性能的影响

白宇恩(), 张彬瑞, 刘东阳, 赵亮(), 高金森, 徐春明   

  1. 中国石油大学(北京)重质油国家重点实验室,北京 102249
  • 收稿日期:2022-09-01 修回日期:2023-01-10 出版日期:2023-01-05 发布日期:2023-03-20
  • 通讯作者: 赵亮
  • 作者简介:白宇恩(1994—),男,博士研究生,ccutbye@126.com
  • 基金资助:
    国家自然科学基金项目(21838011);国家重点研发计划项目(2020YFA0210900)

Influence of synergistic effect of acid properties and pore structure of ZSM-5 zeolite on the catalytic cracking performance of pentene

Yuen BAI(), Binrui ZHANG, Dongyang LIU, Liang ZHAO(), Jinsen GAO, Chunming XU   

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
  • Received:2022-09-01 Revised:2023-01-10 Online:2023-01-05 Published:2023-03-20
  • Contact: Liang ZHAO

摘要:

采用不同浓度碱液处理制备了具有不同酸性质的多级孔HZSM-5分子筛,并考察其酸性能与孔结构变化对催化裂化(FCC)汽油中C5烯烃催化裂解性能的影响。利用X射线衍射(XRD)、N2吸附脱附、氨气程序升温脱附技术(NH3-TPD)、吡啶红外(Py-IR)和扫描电镜(SEM)等表征手段研究了HZSM-5分子筛的结构、形貌、酸性质和孔道性能。研究结果表明,适宜浓度的碱液处理可以提高HZSM-5分子筛的强Brønsted (B酸)酸量和介孔体积,显著提高C5烯烃转化率和乙烯、丙烯的收率。当碱液浓度为0.2 mol·L-1,HZSM-5分子筛强B酸中心和介孔体积之间的协同作用促进了C5烯烃的高效转化,转化率为84.8%(质量分数),乙丙烯总收率为86.0%(质量分数),分别比未处理的HZSM-5分子筛增加4.4%和15.5%。

关键词: 碱处理, ZSM-5分子筛, 催化裂解, 低碳烯烃

Abstract:

Hierarchical pore HZSM-5 zeolite with different acid properties was prepared by using alkali treatment with different concentrations, and the effect of their pore properties on the catalytic cracking performance of C5 olefins in FCC gasoline was investigated. The structure, morphology, acid properties and pore properties of HZSM-5 zeolite were investigated using XRD, N2 adsorption desorption, ammonia programmed temperature desorption technique (NH3-TPD), pyridine infrared (Py-IR), and scanning electron microscopy (SEM) characterization. The results showed that the appropriate concentration of alkali treatment could increase the amount of strong B acid site and mesopore volume of HZSM-5 zeolite, and significantly increase the conversion of C5 olefins and the yields of ethylene and propylene. When the alkali concentration was 0.2 mol·L-1, the synergistic effect between the strong B acid site and mesopore volume of HZSM-5 zeolite promoted the efficient conversion of C5 olefins, the conversion rate was 84.8% (mass), and the total yield of ethylene-propylene was 86.0% (mass), which was 4.4% and 15.5% higher than that of the untreated HZSM-5 zeolite, respectively.

Key words: alkali treatment, ZSM-5 zeolite, catalytic cracking, light olefins

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