Investigation on the structure-activity relationship and the role of peroxo groups on the TiO2 surface in thioanisole oxidation with hydrogen peroxide

Autor(es)

Fajardo, Humberto, V ; Teixeira, Moises P. ; Ribeiro, Lucas S. ; Giroto, Amanda S. ; Nogueira, Andre E.

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS; v. 315, p. 7-pg., 2025-05-01.

Resumo

The study details the synthesis of TiO2 catalysts with varying peroxo group content and crystallinity levels, followed by a comprehensive characterization using techniques such as X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis (TG), differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The catalytic activity of these TiO2 catalysts was systematically evaluated for the oxidation of thioanisole under varying reaction times and temperatures. The findings indicate that catalysts exhibiting higher crystallinity and reduced surface peroxo group content display superior catalytic activity and selectivity toward methyl phenyl sulfone. Notably, the TiO2 catalyst subjected to a 400 degrees C heat treatment demonstrates optimal performance. This research underscores the crucial role of surface properties and reaction conditions in catalytic processes, offering valuable insights for the designing of efficient and environmentally friendly oxidation reactions. (AU)

• Processo FAPESP: 23/14112-7 - Desenvolvimento de polímeros hidrolisáveis para proteção, veiculação e liberação controlada de microrganismos promotores de crescimento em plantas
• Beneficiário: Lucas da Silva Ribeiro
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 23/17686-4 - Desenvolvimento de catalisadores multifuncionais de nióbio: avanços na conversão de CO2 e geração de H2
• Beneficiário: André Esteves Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Regular