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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(A) N2 adsorption–desorption isotherms and (B) pore size distribution as dV/dw vs. pore width calculated by BJH method on the desorption branch for Nb2O5 and Nb2O5-based mixed oxides as well as (C,D) for the bare TiO2.