(740f) Boron-Hyperdoped Silicon for the Selective Oxidative Dehydrogenation of Propane to Propylene | AIChE

(740f) Boron-Hyperdoped Silicon for the Selective Oxidative Dehydrogenation of Propane to Propylene


Chen, J. - Presenter, University At Buffalo
Rohani, P., University at Buffalo, The State University of New York
Swihart, M., University at Buffalo
Kyriakidou, E., SUNY at Buffalo
Propylene (C3H6) is one of the most important building blocks in the petrochemical industry. It is used in the production of many industrial products, such as polypropylene, propylene oxide and isopropanol [1]. Propylene is traditionally produced from steam cracking and fluid catalytic cracking in petroleum refineries. However, both technologies suffer from low selectivity, high energy consumption and significant production of CO2 emissions. Direct production of C3H6 from the dehydrogenation of propane is currently of great interest in an effort to close the C3H6 supply and demand gap in the US. Oxidative dehydrogenation of propane (ODHP) reactions have attracted extensive attention as they are more resistant to coke deposition compared to non-oxidative DHP reactions and they are not limited by equilibrium.

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 gC₃H₆gcat-1h-1) at 500℃ compared to commercial hexagonal boron nitride (0.82 gC₃H₆gcat-1h-1) under the same reaction conditions (WHSV = 28.2 gC₃H₈gcat-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).


[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.