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Photo-Thermal Synergistic Catalytic Oxidative Dehydrogenation of Propane over a Spherical Superstructure of Boron Carbon Nitride Nanosheets

APPLIED SURFACE SCIENCE(2023)

China Univ Petr East China | Shandong Energy Grp Co Ltd | Nanjing Univ | QingHai Salt Lake Ind Co Ltd

Cited 0|Views33
Abstract
The oxidative dehydrogenation of propane (ODHP) is an attractive reaction for increasing the production of light olefins due to its favorable thermodynamic and kinetic characteristics. However, the overoxidation of propene to thermodynamically favored COx leads to a trade-off between propane conversion and propene selectivity, limiting the optimization of the overall catalytic performance. Here we show that photo-thermal synergistic catalysis driven by a spherical superstructure of semiconducting boron carbon nitride nanosheets (SS-BCNNSs) breaks the conversion-selectivity trade-off, resulting in a remarkable enhancement of propane conversion, along with a well-maintained selectivity for propene under mild conditions. The mechanism study shows that the introduction of light irradiation during the ODHP process could change the reaction order, activate the reactants, and reduce the activation energy for ODHP. DFT calculations reveal that the photogenerated electrons provided by SS-BCNNSs promote oxygen adsorption and significantly reduce the energy barrier for generating active B-O center dot species, which in turn produces more active sites and enhances the reactivity.
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Photo-thermal synergistic catalysis,Oxidative dehydrogenation of propane,Boron carbon nitride,Metal-organic framework
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要点】:本研究展示了一种基于球形超结构半导体的硼碳氮纳米片(SS-BCNNSs)光热协同催化氧化脱氢丙烷的方法,突破了转化与选择性之间的传统权衡,实现了丙烷转化率和丙烯选择性的双重提升。

方法】:采用了一种球形超结构的半导体硼碳氮纳米片作为催化剂,通过光热协同催化作用,在温和条件下提高了丙烷的氧化脱氢效率。

实验】:在氧化脱氢丙烷过程中引入光照,通过实验发现光照改变了反应的顺序,降低了反应的活化能,促进了反应物的活性。使用SS-BCNNSs作催化剂,在光照下显著提高了氧气的吸附能力,降低了形成活性B-O物种的能量壁垒,从而增加了活性位点,提升了反应活性。具体数据集名称和实验结果未在摘要中提及。