Plasma Tuning Local Environment of Hexagonal Boron Nitride for Oxidative Dehydrogenation of Propane

Abstract

Hexagonal boron nitride (h-BN) has lately received great attention in the oxidative dehydrogenation (ODH) reaction of propane to propylene for its extraordinary olefin selectivity in contrast to metal oxides. However, high crystallinity of commercial h-BN and elusive cognition of active sites hindered the enhancement of utilization efficiency. Herein, four kinds of plasmas (N 2 , O 2 , H 2 , Ar) were accordingly employed to regulate the local chemical environment of h-BN. N 2 -treated BN exhibited a remarkable activity, i.e., 26.0 % propane conversion with 89.4 % selectivity toward olefins at 520 8C. Spectroscopy demonstrated that "three-boron center" N-defects in the catalyst played a pivotal role in facilitating the conversion of propane. While the sintering effect of the "BO x " species in O 2 -treated BN, led to the suppressed catalytic performance (12.4 % conversion at 520 8C).

Safeguarding the RuO2 phase against lattice oxygen oxidation during acidic water electrooxidation

“…Half-cell performances for the OER in acidic electrolytes were compared in Table S3 (ESI†) and the Pt embedded RuO 2 /C NRs showed better performances than those of other RuO 2 -based catalysts. The introduction of Pt and Co in the RuO 2 shell has led to a superior SA on PtCo–RuO 2 /C to that of Pt–RuO 2 /C likely due to the formation of defective RuO 2 structures 36 and electronic interaction between Pt and Ru.…”

Multiple Promotional Effects of Vanadium Oxide on Boron Nitride for Oxidative Dehydrogenation of Propane

“…The major band at 398.2 eV in N 1s XP spectra is the nitrogen bonded with boron in BN at the surface ( Figure 7 B). 11 A subpeak at 400.0 eV corresponds to N–H species, implying the formation of N defects, 9 and these N–H species maximize at spent 0.75V/BN-T ( Table S4 ). Recently, Lu et al have reported that these N defects might lead to the evolution of active BO x species.…”

“… 3 , 8 Very recently, plasma treatment was reported to regulate the local environment of h-BN by creating nitrogen defects, favoring the generation of BO x active sites. 11 Efforts are also devoted to developing BO x -containing advanced materials for ODHP reaction, including boron phosphate 25 , 26 and metal–organic framework-derived catalysts. 27 …”

Light olefin synthesis from a diversity of renewable and fossil feedstocks: state-of the-art and outlook

“…Consequently, a propane conversion of 26% and a propylene selectivity of 89.4% were achieved at 520 °C. 124 Crystallinity was found to be an important parameter for the h-BN performance and its higher degree enhanced O 2 binding. A selectivity of 82% at a conversion of 42% was obtained.…”