Oxidative dehydroge nation of ethylbenzene is con sidered as an alter native route to styrene because of its exothermic and irreversible reaction nature,but encounters low styrene selectivity due to the deep-oxidation...Oxidative dehydroge nation of ethylbenzene is con sidered as an alter native route to styrene because of its exothermic and irreversible reaction nature,but encounters low styrene selectivity due to the deep-oxidation over metal oxide-based catalysts.Herein,we reported that a metal-free boron-based catalyst consisting of boron phosphate and boron nitride(BPO_(4)/BN)exhibited high activity and selectivity in oxidative dehydroge nation of ethylbenze ne to sty re ne.High selectivity of styre ne(95.1%)was achieved at 27.7%ethylbenzene conversion level over the optimized BPO_(4)/BN catalyst.The tetra-coordinated boron(BO_(4))species of BPO_(4) was speculated to be responsible for the ODH of ethylbenzene,and a synergistic effect between BPO4 and BN can remarkably improve the catalytic performance of the BPO_(4)/BN catalyst.The optimized BPO_(4)/BN catalyst showed a higher styrene formation rate of 4.0mmol g_(cat)^(-1)·h^(-1),compared individually to BPO_(4)(2.8mmol g_(cat)^(-1)·h^(-1))and BN(0.5mmol g_(cat)^(-1)·h^(-1)).展开更多
基金supported by the State Key Program of the National Natural Science Foundation of China(No.21733002)Cheung Kong Scholars Program of China(No.T2015036).
文摘Oxidative dehydroge nation of ethylbenzene is con sidered as an alter native route to styrene because of its exothermic and irreversible reaction nature,but encounters low styrene selectivity due to the deep-oxidation over metal oxide-based catalysts.Herein,we reported that a metal-free boron-based catalyst consisting of boron phosphate and boron nitride(BPO_(4)/BN)exhibited high activity and selectivity in oxidative dehydroge nation of ethylbenze ne to sty re ne.High selectivity of styre ne(95.1%)was achieved at 27.7%ethylbenzene conversion level over the optimized BPO_(4)/BN catalyst.The tetra-coordinated boron(BO_(4))species of BPO_(4) was speculated to be responsible for the ODH of ethylbenzene,and a synergistic effect between BPO4 and BN can remarkably improve the catalytic performance of the BPO_(4)/BN catalyst.The optimized BPO_(4)/BN catalyst showed a higher styrene formation rate of 4.0mmol g_(cat)^(-1)·h^(-1),compared individually to BPO_(4)(2.8mmol g_(cat)^(-1)·h^(-1))and BN(0.5mmol g_(cat)^(-1)·h^(-1)).
