echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Chemicals Industry > China Chemical > MOF regulates Pd to improve catalytic activity and selectivity

    MOF regulates Pd to improve catalytic activity and selectivity

    • Last Update: 2021-06-22
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com

    Catalysis is closely related to our production and life, and the construction of high-efficiency catalysts is the goal of scientists in the field of catalysis
    .


    Metal nanocatalysts are the most common heterogeneous catalyst centers


    At present, a lot of work has proved that small molecule modified metal catalyst is an effective means to improve catalytic performance
    .


    The traditional method is mainly to modify small molecules on the metal surface, but the modified small molecules will cover the metal active sites, which easily causes the contact between the substrate and the metal sites to be limited and is not conducive to the catalytic activity


    Recently, the team of Professor Hailong Jiang from the University of Science and Technology of China coated highly active metal nanoparticles in a metal organic framework (MOF) to construct a metal@MOF composite catalyst.
    Systematic regulation of the environment, thereby realizing the simultaneous optimization of the catalytic efficiency and selectivity of the metal sites
    .

    Figure 1.
    The construction of Pd@MIL-101-Fx composite catalyst has significant advantages

    Based on the modifiable amino sites in MIL-101-NH 2 and the post-synthetic modification method, the USTC team modified fluorine-containing small molecules into the MOF framework, and strategically constructed Pd@MIL-101-Fx (X= 3 , 5, 7, 11, 15) Nano composite catalyst
    .


    After hydrophobic modification, the MOF structure can be maintained, and the size of Pd can still be maintained and still be coated in the MOF pores


    Figure 2.
    Compared with Pd particles protected by surfactants and Pd particles coated with prototype MOF, the modified Pd@MIL-101-Fx (X= 3, 5, 7, 11, 15) is not only higher The catalytic activity can also be synchronized to optimize the reaction selectivity
    .

    In terms of catalytic application, the USTC team took the important industrial reaction of selective hydrogenation of nitrochlorobenzene as the research object, and evaluated the performance of the catalyst.
    The results showed that the hydrophobically modified Pd@MIL-101-Fx can be selectively hydrogenated.
    Catalyzes the hydrogenation of nitro functional groups without dechlorination, and efficiently obtains p-chloroaniline products with a conversion rate of >99% and a selectivity of up to 98%
    .


    In order to further study the reasons for high performance, the author combined the experimental characterization and DFT calculation results and found that in the modified Pd@MIL-101-Fx, the surface valence of Pd is normal, which will selectively adsorb higher electrons.


      Figure 3.


      This result was recently published in Chem.



    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.