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Abstract:
The ultimate objective of chemical conversion is to achieve 100% selectivity considering catalysis, which is also a prodigious challenge for the conversion of light paraffins to olefins all because it involves controlled activation of the highly stable aliphatic C–H bonds. Here we show that metal-free boron nitride (BN) nanosheets not only enable oxidative dehydrogenation of ethane to exclusively ethylene at near 10% conversion, but also deliver a remarkable 60% selectivity at
an ethane conversion of 78% and remain stable over 400 hours at 575 °C. Our operando infrared spectroscopy and 18O isotope tracer study explicitly demonstrate that the active sites of B-O(H) are formed
at the edges of BN via the aid of ethane and the dehydrogenation circle can be completed by the assistant of O2 over B-O sites.
