Probing the Transformation of Boron Nitride Catalysts under Oxidative Dehydrogenation Conditions
| Autor: | Juan M. Venegas, Michael P. Hanrahan, Aaron J. Rossini, Joseph T. Grant, Ive Hermans, Melissa C. Cendejas, Brijith Thomas, Samuel P. Burt, Sarah E. Specht, Alyssa M. Love, William P. McDermott |
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| Rok vydání: | 2018 |
| Předmět: |
Alkane
chemistry.chemical_classification Oxide chemistry.chemical_element General Chemistry 010402 general chemistry Photochemistry 01 natural sciences Biochemistry Oxygen Catalysis 0104 chemical sciences chemistry.chemical_compound Colloid and Surface Chemistry chemistry Propane Boron nitride Dehydrogenation Boron |
| Zdroj: | Journal of the American Chemical Society. 141:182-190 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | Hexagonal boron nitride (h-BN) and boron nitride nanotubes (BNNT) were recently reported as highly selective catalysts for the oxidative dehydrogenation (ODH) of alkanes to olefins in the gas phase. Previous studies revealed a substantial increase in surface oxygen content after exposure to ODH conditions (heating to ca. 500 °C under a flow of alkane and oxygen); however, the complexity of these materials has thus far precluded an in-depth understanding of the oxygenated surface species. In this contribution, we combine advanced NMR spectroscopy experiments with scanning electron microscopy and soft X-ray absorption spectroscopy to characterize the molecular structure of the oxygen functionalized phase that arises on h-BN and BNNT following catalytic testing for ODH of propane. The pristine BN materials are readily oxidized and hydrolyzed under ODH reaction conditions to yield a phase consisting of three-coordinate boron sites with variable numbers of hydroxyl and bridging oxide groups which is denoted B(OH) |
| Databáze: | OpenAIRE |
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