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Title: Probing the Transformation of Boron Nitride Catalysts under Oxidative Dehydrogenation Conditions

Journal Article · · Journal of the American Chemical Society

Hexagonal boron nitride (h-BN) and boron nitride nanotubes (BNNTs) 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 (SEM) and soft X-ray absorption spectroscopy (XAS) to characterize the molecular structure of the oxygen functionalized phase that arises on h-BN and BNNTs 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)xO3-x (where x = 0-3). Evidence for this robust oxide phase revises previous literature hypotheses of hydroxylated BN edges as the active component on h-BN.

Research Organization:
Ames Lab., Ames, IA (United States); Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358; SC0017918
OSTI ID:
1492337
Report Number(s):
IS-J--9850
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 1 Vol. 141; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Construction of a Nanoporous Highly Crystalline Hexagonal Boron Nitride from an Amorphous Precursor for Catalytic Dehydrogenation journal June 2019
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Boron and Nitride Dual vacancies on Metal‐Free Oxygen Doping Boron Nitride as Initiating Sites for Deep Aerobic Oxidative Desulfurization journal March 2020
Selective Oxidative Cracking of n‐ Butane to Light Olefins over Hexagonal Boron Nitride with Limited Formation of CO x journal October 2019
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