Koito, Yusuke, Rees, Gregory J., Hanna, John V., Li, Molly M. J., Peng, Yung-Kang, Puchtler, Tim, Taylor, Robert, Wang, Tong, Kobayashi, Hisayoshi, Teixeira, Ivo F., Khan, M. Abdullah, Kreissl, Hannah T. and Tsang, S. C. Edman (2017) Structure-activity correlations for Brønsted acid, Lewis Acid, and photocatalyzed reactions of exfoliated crystalline niobium oxides. ChemCatChem, 9 (1). pp. 144-154. doi:10.1002/cctc.201601131 ISSN 1867-3880.

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Abstract

Exfoliated crystalline niobium oxides that contain exposed but interconnected NbO6 octahedra with different degrees of structural distortion and defects are known to catalyze Brønsted acid (BA), Lewis acid (LA), and photocatalytic (PC) reactions efficiently but their structure–activity relationships are far from clear. Here, three exfoliated niobium oxides, namely, HSr2Nb3O10, HCa2Nb3O10, and HNb3O8, are synthesized, characterized extensively, and tested for selected BA, LA, and PC reactions. The structural origin for BA is associated mainly with acidic hydroxyl groups of edge-shared NbO6 octahedra as proton donors; that of LA is associated with the vacant band position of Nb5+ to receive electron pairs from substrate; and that of PC is associated with the terminal Nb=O of NbO6 octahedra for photon capture and charge transfer to long-lived surface adsorbed substrate complex through associated oxygen vacancies in close proximity. It is believed that an understanding of the structure–activity relationships could lead to the tailored design of NbOx catalysts for industrially important reactions.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Niobium oxide -- Synthesis, Lewis acids, Catalysts
Journal or Publication Title:	ChemCatChem
Publisher:	Wiley - V C H Verlag GmbH & Co. KGaA
ISSN:	1867-3880
Official Date:	9 January 2017
Dates:	Date Event 9 January 2017 Published 23 December 2016 Available 6 October 2016 Available 9 October 2016 Submitted
Volume:	9
Number:	1
Page Range:	pp. 144-154
DOI:	10.1002/cctc.201601131
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	30 January 2017
Date of first compliant Open Access:	30 January 2017
Funder:	Engineering and Physical Sciences Research Council (EPSRC), University of Oxford, University of Warwick, Birmingham Science City, Advantage West Midlands (AWM), European Regional Development Fund (ERDF), Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC)
Grant number:	Contract reference PR140003 (BBSRC)

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