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    Home > Chemicals Industry > Chemical Technology > Study to elucidate the catalytic performance of hindered Lewis acid-base pairs in molecular sieve cages

    Study to elucidate the catalytic performance of hindered Lewis acid-base pairs in molecular sieve cages

    • Last Update: 2022-03-02
    • Source: Internet
    • Author: User
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    Frustrated Lewis Pairs (FLP) are an important concept in homogeneous catalysis reactions.


    Molecular sieves catalyze the stable reaction period of methanol to olefins, polytoluene carbocations and cyclopentadiene carbocations as hydrocarbon pool intermediate species drive the efficient production of olefins through the aromatics cycle, and these carbocations have been identified by a variety of spectroscopic methods.


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    In order to further verify the catalytic activity of this novel hindered Lewis acid-base pair, the activity of these FLPs for hydrogen splitting was discussed through theoretical calculations.


    In addition to being useful for cracking hydrogen, FLP also exhibits the ability to activate C-H bonds of alkanes


    The study used gas-mass spectrometry to verify the dehydrogenation of FLP propane to propylene.


    This study extends the concept of hindered Lewis acid-base, determines the catalytic reactivity of the carbocation in the molecular sieve cage and the negatively charged oxygen atom center of the molecular sieve framework to form a hindered Lewis acid-base pair, and puts forward a new understanding of the reaction network of methanol to olefins


    (a) Aromatic cycle mechanism of methanol to olefins driven by carbocation; (b) hindered Lewis acid-base pair structure; (c) Lewis acid-base pair composed of carbocations in zeolite cages; (d) zeolite-catalyzed reaction Common polytoluene carbocations

    Potential energy surface and activation energy (a) and molecular orbital evolution (b) of hindered Lewis acid-base for hydrogen splitting

    (a) Mechanism of FLP dehydrogenation of alkanes to olefins (b) GC-MS experiment of propane dehydrogenation in SAPO-34 molecular sieves with and without FLP

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