(740f) Boron-Hyperdoped Silicon for the Selective Oxidative Dehydrogenation of Propane to Propylene
AIChE Annual Meeting
2020 Virtual AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Hydrocarbon Conversion II: Light Alkane Dehydrogenation
Wednesday, November 18, 2020 - 9:15am to 9:30am
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 . 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).
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