Rong Fan, Jiarong Lu, Hao Yan, Yibin Liu, Xin Zhou, Hui Zhao, Xiang Feng, Xiaobo Chen, Chaohe Yang
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The lone-electronic pair character of O* activates the benzene C-H bond by constructing C-O bond with C atom of benzene, promoting the formation of phenol products. In addition, after benzene captures O* to form phenol, the positively charged bare single metal atom activates the phenol O-H bond by electron interaction with the O atom in the phenol, inducing the generation of benzoquinone by-products. The activation process of O-H bond is accompanied by H atom falling onto the carrier. On this basis, it can be inferred that adsorption energy of the C atom on the O* atom (<i>E</i><sub><i>C</i></sub>) and the H atom on the TM<sub>1</sub>-N<sub>4</sub>/C (<i>E</i><sub>H</sub>), which respectively represent activation ability of benzene C-H bond and phenol O-H bond, could be labeled as descriptors describing catalytic activity and selectivity. Moreover, based on the as-obtained volcano map, appropriate <i>E</i><sub>C</sub> (−8 to −7 eV) and weakened <i>E</i><sub>H</sub> (−1.5 to 0 eV) contribute to the optimization of catalytic performance for benzene oxidation to phenol. 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引用次数: 0
摘要
由于缺乏全面的机理和机理驱动方法,探索有效的过渡金属单原子催化剂将苯选择性氧化为苯酚仍然是一个巨大的挑战。在此,我们采用密度泛函理论和微动力学建模方法系统地筛选了嵌入石墨烯(TM1-N4/C)的强健的 4N 配位过渡金属单原子催化剂,以评估它们在苯氧化反应中的选择性和活性。我们的研究结果表明,单个金属原子会引发 H2O2 解离,形成活性氧物种(O*)。O* 的孤电子对特性通过与苯的 C 原子构建 C-O 键来激活苯的 C-H 键,促进苯酚产物的形成。此外,苯俘获 O* 形成苯酚后,带正电的裸单个金属原子通过与苯酚中的 O 原子发生电子相互作用,激活苯酚的 O-H 键,诱导苯醌副产物的生成。O-H 键的活化过程伴随着 H 原子落到载体上。据此可以推断,C 原子在 O* 原子上的吸附能(EC)和 H 原子在 TM1-N4/C 上的吸附能(EH)分别代表苯 C-H 键和苯酚 O-H 键的活化能力,可以作为描述催化活性和选择性的描述符。此外,根据已获得的火山图,适当的 EC(-8 至 -7 eV)和减弱的 EH(-1.5 至 0 eV)有助于优化苯氧化为苯酚的催化性能。这项研究为合理设计金属单原子催化剂提供了深刻的见解,使其在烃氧化过程中表现出良好的催化性能。
Comprehensive mechanism and microkinetic model-driven rational screening of 4N-modulated single-atom catalysts for selective oxidation of benzene to phenol
Exploring effective transition metal single-atom catalysts for selective oxidation of benzene to phenol is still a great challenge due to the lack of a comprehensive mechanism and mechanism-driven approach. Here, robust 4N-coordinated transition metal single atom catalysts embedded within graphene (TM1-N4/C) are systematically screened by density functional theory and microkinetic modeling approach to assess their selectivity and activity in benzene oxidation reaction. Our findings indicate that the single metal atom triggers the dissociation of H2O2 to form an active oxygen species (O*). The lone-electronic pair character of O* activates the benzene C-H bond by constructing C-O bond with C atom of benzene, promoting the formation of phenol products. In addition, after benzene captures O* to form phenol, the positively charged bare single metal atom activates the phenol O-H bond by electron interaction with the O atom in the phenol, inducing the generation of benzoquinone by-products. The activation process of O-H bond is accompanied by H atom falling onto the carrier. On this basis, it can be inferred that adsorption energy of the C atom on the O* atom (EC) and the H atom on the TM1-N4/C (EH), which respectively represent activation ability of benzene C-H bond and phenol O-H bond, could be labeled as descriptors describing catalytic activity and selectivity. Moreover, based on the as-obtained volcano map, appropriate EC (−8 to −7 eV) and weakened EH (−1.5 to 0 eV) contribute to the optimization of catalytic performance for benzene oxidation to phenol. This study offers profound opinions on the rational design of metal single-atom catalysts that exhibit favorable catalytic behaviors in hydrocarbon oxidation.
期刊介绍:
Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.