@article{894e2c8e7ccb4a449442e5d94f8b054b,
title = "Bulk-to-nano regulation of layered metal oxide gears H2O2 activation pathway for its stoichiometric utilization in selective oxidation reaction",
abstract = "H2O2 has been widely used as a green oxidant in many heterogeneous reactions. However, its disproportionation accelerated by either Br{\o}nsted acid (BA) or redox metal sites often results in low H2O2 utilization. Given this, metals less able to redox have been used because the formation of surface metal-peroxo species exhibits a certain degree of selectivity towards substrates. However, those catalysts often bear BA sites on their surface for charge balance, making it imperative to study H2O2 activation pathway in the presence of both sites. Herein, layered HNb3O8 with structurally preserved BA sites was used for this purpose. We found that the exposure of Nb sites via bulk-to-nano regulation of this material hinders H2O2 disproportionation promoted by BA sites. Among various Nb-peroxo species, its bidentate configuration formed on highly distorted NbOx was found to provide the best reactivity in alkene epoxidation with a near stoichiometric H2O2 utilization.",
keywords = "Br{\o}nsted and Lewis acids, HO activation pathway, Niobates, Selective oxidation, Surface chemistry",
author = "Guohan Sun and Li, {Molly Meng Jung} and Keizo Nakagawa and Guangchao Li and Wu, {Tai Sing} and Peng, {Yung Kang}",
note = "Funding Information: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Yung Kang Peng reports financial support was provided by National Natural Science Foundation of China. Yung Kang Peng reports financial support was provided by Guangdong Basic and Applied Basic Research Foundation. Yung Kang Peng reports financial support was provided by Hong Kong Research Grants Council. Yung Kang Peng reports financial support was provided by Chow Sang Sang Group Research Fund. Funding Information: We thank the National Natural Science Foundation of China ( 21902138 ), Guangdong Basic and Applied Basic Research Foundation ( 2021A1515010064 ), the Hong Kong Research Grants Council ( CityU 21301719 , CityU 11300020 and CityU 11305721 ), and Chow Sang Sang Group Research Fund ( 9229063 ) sponsored by Chow Sang Sang Holdings International Limited for funding support. We acknowledge the University Research Facilities in Materials Research Centre (MRC) and Chemical and Environmental Analysis (UCEA) of PolyU for experiments support. Funding Information: We thank the National Natural Science Foundation of China (21902138), Guangdong Basic and Applied Basic Research Foundation (2021A1515010064), the Hong Kong Research Grants Council (CityU 21301719, CityU 11300020 and CityU 11305721), and Chow Sang Sang Group Research Fund (9229063) sponsored by Chow Sang Sang Holdings International Limited for funding support. We acknowledge the University Research Facilities in Materials Research Centre (MRC) and Chemical and Environmental Analysis (UCEA) of PolyU for experiments support. Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",
year = "2022",
month = sep,
day = "15",
doi = "10.1016/j.apcatb.2022.121461",
language = "English",
volume = "313",
journal = "Applied Catalysis B: Environmental",
issn = "0926-3373",
publisher = "Elsevier B.V.",
}