催化学报 ›› 2022, Vol. 43 ›› Issue (7): 1879-1893.DOI: 10.1016/S1872-2067(21)63990-6

• 论文 • 上一篇    下一篇

MFI/MEL分子筛催化甲醇制烯烃反应关键参数的集成方法

Chuncheng Liua,d, Evgeny A. Uslamina, Sophie H. van Vreeswijkc, Irina Yarulinab, Swapna Ganapathyc, Bert M. Weckhuysenc, Freek Kapteijnd,*(), Evgeny A. Pidkoa,#()   

  1. a代尔夫特理工大学化学工程系, 无机系统工程, 代尔夫特, 荷兰
    b巴斯夫股份公司, 工艺研究和化学工程, 路德维希港, 德国
    c乌特勒克大学德拜纳米材料科学研究所, 无机化学与催化, 乌特勒克, 荷兰
    d代尔夫特理工大学化工系, 催化工程系, 代尔夫特, 荷兰
  • 收稿日期:2021-11-08 接受日期:2021-12-04 出版日期:2022-07-18 发布日期:2022-05-20
  • 通讯作者: Freek Kapteijn,Evgeny A. Pidko

An integrated approach to the key parameters in methanol-to-olefins reaction catalyzed by MFI/MEL zeolite materials

Chuncheng Liua,d, Evgeny A. Uslamina, Sophie H. van Vreeswijkc, Irina Yarulinab, Swapna Ganapathyc, Bert M. Weckhuysenc, Freek Kapteijnd,*(), Evgeny A. Pidkoa,#()   

  1. aInorganic Systems Engineering, Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, the Netherlands
    bBASF SE, Process Research and Chemical Engineering, Ludwigshafen 67056, Germany
    cInorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3854 CG Utrecht, the Netherlands
    dCatalysis Engineering, Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, the Netherlands
  • Received:2021-11-08 Accepted:2021-12-04 Online:2022-07-18 Published:2022-05-20
  • Contact: Freek Kapteijn, Evgeny A. Pidko
  • Supported by:
    BASF and the Advanced Research Center Chemical Building Blocks Consortium (ARC CBBC) for Funding under Project(2016.007.TUD)

摘要:

了解与关键催化性能参数(如选择性和稳定性)相关的催化剂特性对于合理设计催化剂是非常重要的. 本文重点考察了甲醇制烯烃(MTO)过程中MFI、MEL及其共生沸石分子筛的催化行为和构效关系. 表征结果表明, 丙烯和丁烯的高产率和MeOH的高转化率均与Pentasil分子筛结构中晶格Al位的富集相关, 这也被27Al MAS NMR结果和3-甲基戊烷裂解结果证实. 催化剂对MTO反应的催化性能与其晶体尺寸、外部B酸中心和铝配对等性质之间缺乏相关性, 表明它们对提高丙烯选择性的作用不大. 本文分析表明, 催化剂失活非常复杂, 受交叉点处晶格铝富集、总铝含量和晶体尺寸影响较大, 且MFI和MEL相共生加速了催化剂失活.

关键词: 构效关系, 分子筛催化, 甲醇制烯烃, 铝分布, 酸性, 共生MFI/MEL, Pentasil分子筛

Abstract:

Identification of the catalyst characteristics correlating with the key performance parameters including selectivity and stability is key to the rational catalyst design. Herein we focused on the identification of property-performance relationships in the methanol-to-olefin (MTO) process by studying in detail the catalytic behaviour of MFI, MEL and their respective intergrowth zeolites. The detailed material characterization reveals that both the high production of propylene and butylenes and the large MeOH conversion capacity correlate with the enrichment of lattice Al sites in the channels of the pentasil structure as identified by 27Al MAS NMR and 3-methylpentane cracking results. The lack of correlation between MTO performance and other catalyst characteristics, such as crystal size, presence of external Brønsted acid sites and Al pairing suggests their less pronounced role in defining the propylene selectivity. Our analysis reveals that catalyst deactivation is rather complex and is strongly affected by the enrichment of lattice Al in the intersections, the overall Al-content, and crystal size. The intergrowth of MFI and MEL phases accelerates the catalyst deactivation rate.

Key words: Structure-performance relationship, Zeolite catalysis, Methanol-to-olefin conversion, Al-distribution, Acidity, Intergrowth MFI/MEL, Pentasil