Fabrication of h‐BN/SiO₂ Nanofibers Showing High Olefins Productivity in Oxidative Dehydrogenation of Propane

Abstract

Fibrous nanomaterials have drawn considerable attention in the field of catalysis due to the promoted utilization of the surface and facilitated mass transfer process. In this study, we prepared one-dimensional nanofiber catalysts consisting of hexagonal boron nitride/silica oxide (h-BN/SiO 2 ) via electrospinning method. The key is to prepare uniform sols consisting of exfoliated h-BN. The diameters of the nanofiber catalysts can be tuned in the range of 150-300 nm through h-BN loading change. When used in oxidative dehydrogenation of propane (ODHP), the obtained nanofibrous catalysts exhibited a 12.4 % conversion of propane and 85.1 % selectivity towards propylene, with remarkable olefins productivity of 24.9 g olefins • g BN À 1 • h À 1 , which is more than 5 times higher than that of bulk ODHP catalysts reported to date. This study shines light on the specific one-dimensional fibrous structure containing dispersed h-BN as well as a new strategy of preparing more efficient boron-based catalysts in the ODHP process.

Subsurface nickel boosts the low-temperature performance of a boron oxide overlayer in propane oxidative dehydrogenation

“…2a and S10). In comparison, h-BN only converted ~7% of propane under the same conditions, similar to previous reports 16,30 . Poor activity was also observed on porous BN (Ni/BN-A, C 3 H 8 conversion less than 2%).…”

“…Although the ODHP process is a low-temperature favorable reaction that is more energy-efficient in theory, it has not yet been implemented on a large scale. The lack of highly selective catalysts to effectively prevent the overoxidation of propane into carbon oxides is one of the most critical challenges.Boron-based nonmetal materials, including hexagonal boron nitride [10][11][12][13][14] , supported boron oxide [15][16][17][18] and boron-doped zeolites [19][20][21][22] , are widely reported to be selective to olefins and to suppress the…”

“…Boron-based nonmetal materials, including hexagonal boron nitride [10][11][12][13][14] , supported boron oxide [15][16][17][18] and boron-doped zeolites [19][20][21][22] , are widely reported to be selective to olefins and to suppress the…”

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

“…In some cases, however, higher dispersion of active phase can decrease the LO selectivity. 122,123 Another approach for the optimization implies N 2 plasma-assisted treatment of h-BN (Fig. 8a) resulting in three-boron active sites.…”

Dimensional Understanding of Boron-Based Catalysts for Oxidative Propane Dehydrogenation: Structure and Mechanism

“…Panels a and b are reproduced from ref , copyright 2017, Wiley–VCH. Panels c and d are reproduced from ref , copyright 2021, Wiley–VCH.…”