首页 文献索引 SCI期刊 AI助手
登录 注册
首页 正文

Catalysis letters. 2023;153(11):3405-3422. doi: 10.1007/s10562-022-04218-6 Q32.32024

New Perspectives for Evaluating the Mass Transport in Porous Catalysts and Unfolding Macro- and Microkinetics

评价多孔催化剂中质量传递的新视角及展开宏微观动力学分析 翻译改进

Stefan Wild  1  2, Christoph Mahr  2  3, Andreas Rosenauer  2  3, Thomas Risse  4, Sergey Vasenkov  5, Marcus Bäumer  1  2

作者单位 +展开

作者单位

  • 1 Institute for Applied and Physical Chemistry, University of Bremen, 28359 Bremen, Germany.
  • 2 MAPEX Center of Materials and Processes, University of Bremen, 28359 Bremen, Germany.
  • 3 Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany.
  • 4 Institute of Chemistry and Biochemistry, Free University Berlin, 14195 Berlin, Germany.
  • 5 Department of Chemical Engineering, University of Florida, Gainesville, FL 32611 USA.
  • DOI: 10.1007/s10562-022-04218-6 PMID: 37799191

    摘要 Ai翻译

    In this article we shed light on newly emerging perspectives to characterize and understand the interplay of diffusive mass transport and surface catalytic processes in pores of gas phase metal catalysts. As a case study, nanoporous gold, as an interesting example exhibiting a well-defined pore structure and a high activity for total and partial oxidation reactions is considered. PFG NMR (pulsed field gradient nuclear magnetic resonance) measurements allowed here for a quantitative evaluation of gas diffusivities within the material. STEM (scanning transmission electron microscopy) tomography furthermore provided additional insight into the structural details of the pore system, helping to judge which of its features are most decisive for slowing down mass transport. Based on the quantitative knowledge about the diffusion coefficients inside a porous catalyst, it becomes possible to disentangle mass transport contributions form the measured reaction kinetics and to determine the kinetic rate constant of the underlying catalytic surface reaction. In addition, predictions can be made for an improved effectiveness of the catalyst, i.e., optimized conversion rates. This approach will be discussed at the example of low-temperature CO oxidation, efficiently catalysed by npAu at 30 °C. The case study shall reveal that novel porous materials exhibiting well-defined micro- and mesoscopic features and sufficient catalytic activity, in combination with modern techniques to evaluate diffusive transport, offer interesting new opportunities for an integral understanding of catalytic processes.

    Keywords: Catalyst effectiveness factors; Diffusive mass transport; Nanoporous gold; Porous heterogeneous catalysts; Pulsed field gradient NMR; TEM tomography; Tortuosity factor.

    Keywords:mass transport; porous catalysts; macro- and microkinetics

    Copyright © Catalysis letters. 中文内容为AI机器翻译,仅供参考!

    相关内容

    期刊名:Catalysis letters

    缩写:CATAL LETT

    ISSN:1011-372X

    e-ISSN:1572-879X

    IF/分区:2.3/Q3

    文章目录 更多期刊信息

    全文链接
    引文链接
    复制
    已复制!
    推荐内容
    New Perspectives for Evaluating the Mass Transport in Porous Catalysts and Unfolding Macro- and Microkinetics