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- W4210686909 abstract "Abstract Boron‐containing materials have recently been identified as highly selective catalysts for the oxidative dehydrogenation (ODH) of alkanes to olefins. It has previously been demonstrated by several spectroscopic characterization techniques that the surface of these boron‐containing ODH catalysts oxidize and hydrolyze under reaction conditions, forming an amorphous B 2 (OH) x O (3− x /2) ( x= 0–6) layer. Yet, the precise nature of the active site(s) remains elusive. In this Communication, we provide a detailed characterization of zeolite MCM‐22 isomorphously substituted with boron (B‐MWW). Using 11 B solid‐state NMR spectroscopy, we show that the majority of boron species in B‐MWW exist as isolated BO 3 units, fully incorporated into the zeolite framework. However, this material shows no catalytic activity for ODH of propane to propene. The catalytic inactivity of B‐MWW for ODH of propane falsifies the hypothesis that site‐isolated BO 3 units are the active site in boron‐based catalysts. This observation is at odds with other traditionally studied catalysts like vanadium‐based catalysts and provides an important piece of the mechanistic puzzle." @default.
- W4210686909 created "2022-02-08" @default.
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- W4210686909 date "2020-02-27" @default.
- W4210686909 modified "2023-10-02" @default.
- W4210686909 title "B‐MWW Zeolite: The Case Against Single‐Site Catalysis" @default.
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- W4210686909 doi "https://doi.org/10.1002/ange.201914696" @default.
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