RODRIGO FERNANDO BRAMBILLA DE SOUZA

RODRIGO FERNANDO BRAMBILLA DE SOUZA

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Methane‑to‑methanol conversion and power co‑generation on palladium
2022 - COELHO, JESSICA F.; FILHO, NIVALDO G.P.; GUTIERREZ, ISABELY M.; GODOI, CAMILA M.; GOMES, PAULO V.R.; ZAMBIAZI, PRISCILLA J.; SOUZA, RODRIGO F.B. de; NETO, ALMIR O.
The use of palladium nickel catalysts with different compositions supported metal oxides, such as Sb2O5·SnO2 (ATO) catalyst combinations were employed to convert the methane-to-methanol in mild conditions using a fuel cell polymer electrolyte reactor. The catalysts used for the conversion of methane to methanol were characterized by XRD and observed the phases of ATO, the face-centered cubic structure of the Pd and Ni phases. All nanoparticles have a mean size between 9 and 12 nm as measured by TEM images. The products obtained from the methane oxidation, such as methanol and formate, were monitored using FT-IR spectroscopy to qualify the products formation, while High-Performance Liquid Chromatography was used to quantify them. In these studies, it was observed that as the electrical potential of the reactor increases, the generation of products decreases. The best results for the conversion of methane into methanol and energy co-generation were obtained from Pd50Ni50/ATO.
cis-[6-(pyridin-2-yl)-1,3,5-triazine-2,4-diamine](dichloride) palladium(II)-based electrolyte membrane reactors for partial oxidation methane to methanol
2022 - GARCIA, LUIS M.S.; ZAMBIAZI, PRISCILLA J.; CHAIR, KHAOULA; DOAN, TUAN D.; RAMOS, ANDREZZA S.; NANDENHA, JULIO; SOUZA, RODRIGO F.B. de; OTUBO, LARISSA; DUONG, ADAM; NETO, ALMIR O.
Methane is an abundant resource and the main constituent of natural gas. It can be converted into higher value-added products and as a subproduct of electricity co-generation. The application of polymer electrolyte reactors for the partial oxidation of methane to methanol to co-generate power and chemical products is a topic of great interest for gas and petroleum industries, especially with the use of materials with a lower amount of metals, such as palladium complex. In this study, we investigate the ideal relationship between cis-[6-(pyridin-2-yl)-1,3,5-triazine-2,4-diamine(dichloride)palladium(II)] (Pd-complex) nanostructure and carbon to obtain a stable, conductive, and functional reagent diffusion electrode. The physical and structural properties of the material were analyzed by Fourier transform infrared (FT-IR) and Raman spectroscopies, transmission electron microscopy (TEM), and X-ray powder diffraction (XRD) techniques. The electrocatalytic activity studies revealed that the most active proportion was 20% of Pd-complex supported on carbon (m/m), which was measured with lower values of open-circuit and power density but with higher efficiency in methanol production with reaction rates of r = 4.2 mol L–1·h–1 at 0.05 V.
Partial methane oxidation in fuel cell-type reactors for co-generation of energy and chemicals
2022 - SOUZA, RODRIGO F.B. de; FLORIO, DANIEL Z.; ANTOLINI, ERMETE; NETO, ALMIR O.
The conversion of methane into chemicals is of interest to achieve a decarbonized future. Fuel cells are electrochemical devices commonly used to obtain electrical energy but can be utilized either for chemicals’ production or both energy and chemicals cogeneration. In this work, the partial oxidation of methane in fuel cells for electricity generation and valuable chemicals production at the same time is reviewed. For this purpose, we compile different types of methane-fed fuel cells, both low- and high-temperature fuel cells. Despite the fact that few studies have been conducted on this subject, promising results are driving the development of fuel cells that use methane as a fuel source for the cogeneration of power and valuable chemicals.
Conversion of methane into methanol using the [6,6′-(2,2′-bipyridine-6,6′-diyl)bis(1,3,5-triazine-2,4-diamine)](nitrato-O)copper(II) complex in a solid electrolyte reactor fuel cell type
2020 - GARCIA, LUIS M.S.; RAJAK, SANIL; CHAIR, KHAOULA; GODOY, CAMILA M.; SILVA, ARACELI J.; GOMES, PAULO V.R.; SANCHES, EDGAR A.; RAMOS, ANDREZZA S.; SOUZA, RODRIGO F.B. de; DUONG, ADAM; NETO, ALMIR O.
The application of solid electrolyte reactors for methane oxidation to co-generation of power and chemicals could be interesting, mainly with the use of materials that could come from renewable sources and abundant metals, such as the [6,6′- (2, 2′-bipyridine-6, 6′-diyl)bis (1,3,5- triazine-2, 4-diamine)](nitrate-O)copper (II) complex. In this study, we investigated the optimal ratio between this complex and carbon to obtain a stable, conductive, and functional reagent diffusion electrode. The most active Cu-complex compositions were 2.5 and 5% carbon, which were measured with higher values of open circuit and electric current, in addition to the higher methanol production with reaction rates of 1.85 mol L−1 h−1 close to the short circuit potential and 1.65 mol L−1 h−1 close to the open circuit potential, respectively. This activity was attributed to the ability of these compositions to activate water due to better distribution of the Cu complex in the carbon matrix as observed in the rotating ring disk electrode experiments.
Synthesis of hydroquinone with co-generation of electricity from phenol aqueous solution in a proton exchange membrane fuel cell reactor
2015 - BUZZO, G.S.; RODRIGUES, A.C.B.; SOUZA, R.F.B. de; SILVA, J.C.M.; BASTOS, E.L.; SPINACE, E.V.; NETO, A.O.; ASSUMPCAO, M.H.M.T.
In a proton exchange membrane fuel cell (PEMFC) an aqueous solution containing 100 mg L−1 of phenol was oxidized at the anode using PtRu/C as catalyst while oxygen gas was reduced at cathode using Pt/C as catalyst. The use of a fuel cell as a flow reactor allowed obtaining hydroquinone, an important compound much used in medicine and cosmetic industry, as product with the co-generation of electricity. A conversion of 20% of phenol with the formation of 16 mg L−1 of hydroquinone (80% of selectivity) was observed after 240 min of fuel cell operation at 80 °C.