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SO2 electro-oxidation study. influence of the temperature and convection regime

Grant number: 18/13944-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2018
Effective date (End): November 23, 2020
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Susana Inés Córdoba de Torresi
Grantee:Leonardo Domenico de Angelis
Home Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage, AP.TEM
Associated scholarship(s):19/22504-7 - Study of the sulfur dioxide electro-oxidation mechanism by 2D ATR-SEIRAS, BE.EP.IC

Abstract

Most of today's energy sources have sulfur compounds in their composition which, when oxidized, release toxic substances into the atmosphere such as sulfur dioxide, a harmful gas lethal in large concentrations, and harm the environment. Its increasing atmospheric concentration makes it necessary to develop cleaner energy generation methods, such as hydrogen gas, which also has a high energy efficiency. However, because H2 is classified as a trace species in the atmosphere, new methods are required for its production, which do not involve fossil fuels or a high energy consumption, such as the oxidation of SO2 to sulfuric acid generating H2 as a by-product.There is a large discrepancy in the literature regarding the mechanism and oscillatory behavior of SO2 oxidation on Au and Pt electrocatalysts. The reaction shows dependence of the supporting electrolyte and the catalyst used, exhibiting HNDR oscillators in the presence of ClO4- in Au. higher catalytic activity when compared to other electrolytes and catalysts. However, factors such as mass transport and temperature are also of great importance to be analyzed in order to have a better understanding about the oscillatory behavior of the reaction.Thus, this project aims to study the oscillatory behavior of SO2 oxidation with the use of RDE techniques to control the diffusional layer, as well as a jacket cell and a conventional thermostat for temperature control, besides a possible verification of the spectra of impedance and its dependence on other variables of the reaction.