2020 Virtual AIChE Annual Meeting
(740f) Boron-Hyperdoped Silicon for the Selective Oxidative Dehydrogenation of Propane to Propylene
Authors
Boron containing catalysts have the highest reported selectivity to C3H6 in the ODHP reaction, but their productivity still remains low. Herein, a series of boron-hyperdoped silicon catalysts with boron concentrations of 15, 25 and 42 at.% were synthesized by a laser pyrolysis method that enables boron concentration exceeding the solubility limit of boron in silicon [2]. The boron-hyperdoped silicon catalysts demonstrated high catalytic activity towards the ODHP reaction, which we attribute to enriched BOx and B-OH species present at the catalyst surface. Specifically, 42 at.% boron-hyperdoped silicon showed around 3.7 times higher C3H6 productivity (3.01 gCâHâgcat-1h-1) at 500â compared to commercial hexagonal boron nitride (0.82 gCâHâgcat-1h-1) under the same reaction conditions (WHSV = 28.2 gCâHâgcat-1h-1, C3H8:O2:Ar = 1:1.5:3.5). Moreover, boron-hyperdoped silicon catalysts showed higher C3H6 productivity and at lower reaction temperatures compared to most reported ODHP catalysts (Fig. 1).
References
[1] J.T. Grant, J.M. Venegas, W.P. McDermott, I. Hermans, Chem. Rev., 118 (2017) 2769-2815.
[2] P. Rohani, S. Banerjee, S. Sharifi-Asl, M. Malekzadeh, R. Shahbazian-Yassar, S.J.L. Billinge, M.T. Swihart, Adv. Funct. Mater., 29 (2019) 9.