Chemistry, Physics and Technology of Surface, 2023, 14 (4), 495-503.

Quantum chemical simulation of acid-base properties of the surface of SnO2 nanoparticles



DOI: https://doi.org/10.15407/hftp14.04.495

O. V. Filonenko, A. G. Grebenyuk, M. I. Terebinska, V. V. Lobanov

Abstract


Molecular models for tin dioxide nanoparticles containing 1-7 metal atoms and coordinated or constitutive water have been constructed. Dependent on the composition of the models, the coordination number of the tin atom varied from 4 to 6, and that of oxygen was 2 or 3. The considered models contained both terminal (Sn–OH) and bridging (Sn–OH–Sn) hydroxyl groups, and also bridging (Sn–O–Sn) groups. Their equilibrium spatial and electronic structures were calculated using the second-order Møller-Plesset perturbation theory method with the SBKJC valence-only basis set. To assess the gas-phase acidity of the dioxide surface, the deprotonation energy of the studied models was determined. The adsorption energy of water molecules and hydroxide ions on aprotic (incompletely coordinated) tin atoms, which act as Lewis acid centers, was calculated. In order to estimate the pKa value of the surface of tin dioxide, the Gibbs free energy was calculated for the process of formation of ion pairs due to the proton transfer from hydroxyl groups to adsorbed water molecules. Based on the analysis of the energy effects of the coordination of water molecules and of hydroxide ion, the removal of a proton and its transfer on the hydrated surface of tin dioxide, quantitative estimates have been made of the acid-base characteristics of the active sites of the SnO2 surface. The dependence of the acidity of hydroxyl groups and coordinated water molecules on the coordination number of the oxygen atom and the neighboring tin atom, as well as on the dimensions of the cluster model, was revealed. It is shown that the acidity of protonic and aprotic sites naturally decreases with an increase in the coordination number of the tin atom. The method of calculating the value of pKa used in the work for the smallest model of the SnO2×2H2O composition allows one to reproduce the experimental data for stannic acids.


Keywords


SnO2 nanoparticles; Møller-Plesset second order perturbation theory; cluster model; acid-base properties; gas phase acidity; proton transfer

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DOI: https://doi.org/10.15407/hftp14.04.495

Copyright (©) 2023 O. V. Filonenko, A. G. Grebenyuk, M. I. Terebinska, V. V. LobanovO. V. Filonenko, A. G. Grebenyuk, M. I. Terebinska, V. V. Lobanov

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