Probing the Transformation of Boron Nitride Catalysts under Oxidative Dehydrogenation Conditions
- Univ. of Wisconsin, Madison, WI (United States)
- US DOE Ames Laboratory, Ames, Iowa 50011, United States
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
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
Similar Records
Serendipity in Catalysis Research: Boron-Based Materials for Alkane Oxidative Dehydrogenation
B–MWW Zeolite: The Case Against Single–Site Catalysis
Related Subjects
36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
42 ENGINEERING
Boron
Boron nitride
Boron-based catalysis
Light alkanes
Materials
Nitrides
Nuclear magnetic resonance spectroscopy
Olefins
Oxidative dehydrogenation
Propane
Propylene
Quantum mechanics
Solid-state NMR
XAS