Tuning the morphology to enhance the catalytic activity of α-Ag2WO4 through V-doping

Katiana Lima Patrocinio; Jeziel Rodrigues Santos; Luis Ignacio Granone; Miguel Adolfo Ponce; Maria Sandra Churio; Lara Kelly Ribeiro; Marcio Daldin Teodoro; Rosa Llusar; Juan Andrés; Elson Longo; Marcelo Assis

doi:10.1039/D3DT02352D

Tuning the morphology to enhance the catalytic activity of α-Ag₂WO₄ through V-doping†

Katiana Lima Patrocinio,^a Jeziel Rodrigues Santos,^a Luis Ignacio Granone,^b Miguel Adolfo Ponce,^cd Maria Sandra Churio,

^b Lara Kelly Ribeiro,

^ae Marcio Daldin Teodoro,^f Rosa Llusar,^e Juan Andrés,

^e Elson Longo

^a and Marcelo Assis

*^e

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* Corresponding authors

^a CDMF-UFSCar, Universidade Federal de São Carlos, P.O. Box 676, CEP, São Carlos, SP, Brazil

^b Departamento de Química y Bioquímica, Facultad de Ciencias Exactas y Naturales, Instituto de Investigaciones Físicas de Mar del Plata (IFIMAR), CONICET, Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Argentina

^c Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Argentina

^d Physics and Engineering Research Center CIFICEN (CICPBA-CONICET), National University of the Center of the Province of Buenos Aires (UNCPBA), Tandil, Argentina

^e Department of Analytical and Physical Chemistry, University Jaume I (UJI), Castelló, Spain
E-mail: marcelostassis@gmail.com

^f Department of Physics, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil

Abstract

Here, we present the synthesis of a highly efficient V-doped α-Ag₂WO₄ catalyst for the oxidation of sulfides to sulfones, exhibiting a high degree of tolerance towards various sensitive functional groups. Remarkably, the catalysts with 0.01% V-doping content exhibited outstanding selectivity towards the oxidation process. Scavenger experiments indicated the direct involvement of electron–hole (e⁻/h⁺) pairs, hydroxyl radical (˙OH), and singlet oxygen (¹O₂) in the catalytic mechanism. Based on the experimental and theoretical results, the higher activity of the V-doped α-Ag₂WO₄ samples was associated with the preferential formation of the (100) surface in the catalyst morphology.

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Tuning the morphology to enhance the catalytic activity of α-Ag₂WO₄ through V-doping†

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Tuning the morphology to enhance the catalytic activity of α-Ag₂WO₄ through V-doping

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