RODRIGO FERNANDO BRAMBILLA DE SOUZA
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Artigo IPEN-doc 29680 Conversão de metano em metanol com co-geração de energia elétrica a partir de catalisadores de paládio suportados em carbono2023 - SILVA, ARACELI J.; ZAMBIAZI, PRISCILLA J.; GOMES, PAULO V.R.; NANDENHA, JULIO; GODOI, CAMILA M.; SOUZA, RODRIGO F.B. de; NETO, ALMIR O.; AZEREDO, NATHALIA F.B.The application of solid electrolyte reactors for methane oxidation and energy co-generation is attractive, especially with the use of catalysts synthesized from noble metals such as palladium. In this work, we prepared three different compositions of palladium on carbon support to evaluate the composition that had the greatest potential for energy generation. Catalysts in the proportions of 5, 10 and 20% of Pd/C were tested for the conversion of greenhouse gases into organic molecules of higher added value using electrochemical fuel cell solid electrolyte reactors. The focus of this work was the conversion of methane into methanol, using the fuel cell as a reactor and the commercial Pd/C as electrocatalyst. The electrocatalysts were tested at the anode, analyzed by infrared (IR) spectroscopy and their activities verified by experiments with rotating ring disk electrode (RRDE). Higher levels of palladium (Pd/C 20%) favored obtaining electrical power, and the intermediate composition (Pd/C 10%) showed a greater production of less oxidized compounds, such as methanol, in addition to generating electricity.Artigo IPEN-doc 29679 Desempenho eletrocatalítico de Pd/C e Pt/C para geração de energia a partir do extrato de cana-de-açúcar em célula a combustível de líquido direto2023 - VILLARDI, BRUNO D.Q.; FILHO, NIVALDO G.P.; GOMES, PAULO V.R.; NANDENHA, JULIO; GODOI, CAMILA M.; TAGOMORI, THAIS L.; AZEREDO, NATHALIA; SOUZA, RODRIGO F.B. de; NETO, ALMIR O.; ZAMBIAZI, PRISCILLA J.The processing of biomass to obtain fuels such as ethanol results in generating waste and polluting the environment. However, to meet energy demand and simultaneously reduce environmental pollution, fuel cells are promising devices for converting chemical compounds into electricity. Fuel cells can be powered by various types of liquids, including the sugars available in sugarcane extract, with high energy potential. Fuel cells employ the use of noble metals as electrocatalysts, such as Pt or Pd, to carry out the oxidation of these fuels. In this sense, this work reports the study of the oxidation of sugarcane extract in these different noble metals. The platinum catalyst was shown to be more active for the oxidation of sugars, resulting in a power density 10 times greater than Pd/C using a 50% diluted sugarcane extract solution, resulting in promising fuel cell systems. To produce ecologically correct electrical energy for the industry in general.Artigo IPEN-doc 20090 Glycerol electrooxidation in alkaline medium using Pd/C, Au/C and PdAu/C electrocatalysts prepared by electron beam irradiation2014 - GERALDES, ADRIANA N.; SILVA, DIONISIO F.; SILVA, JULIO C.M.; SOUZA, RODRIGO F.B.; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR; LINARDI, MARCELO; SANTOS, MAURO C.Pd/C, Au/C and PdAu/C electrocatalysts with different atomic ratios prepared using electron beam irradiation were tested for glycerol electrooxidation in single alkaline direct glycerol fuel cell (ADGFC). X-ray diffractograms (XRD) of PdAu/C electrocatalysts showed the presence of Pd (fcc) and Au (fcc) phases. Cyclic voltammetry (CV) and chronoamperometry showed that PdAu/C electrocatalyst with Pd:Au atomic ratio of 50:50 demonstrated superior activity for glycerol electrooxidation, at room temperature. In situ Fourier transform infrared spectroscopy by attenuated total reflectance (ATR-FTIR) experiments were performed for the electrocatalysts, identifying oxalate, glycerate ion, 1,3-dihydroxy-2-propanone, glyceraldehyde and glycolate as products of glycerol electrooxidation. Experiments with single ADGFC were carried out from 50 to 90 °C, using Pd/C electrocatalyst; the best performance was obtained at 80 °C.Artigo IPEN-doc 18113 PtSnIr/C anode electrocatalysts: promoting effect in direct ethanol fuel cells2012 - SILVA, JULIO C.M.; SOUZA, RODRIGO F.B. de; ROMANO, MAYARA A.; D'VILLA SILVA, MELINA; CALEGARO, MARCELO L.; HAMMER, PETER; OLIVEIRA NETO, ALMIR; SANTOS, MAURO C.Artigo IPEN-doc 19526 Ethanol oxidation reaction on IrPtSn/C electrocatalysts with low Pt content2013 - SILVA, JULIO C.M.; ANEA, BEATRIZ; SOUZA, RODRIGO F.B. de; ASSUMPCAO, MONICA H.M.T.; CALEGARO, MARCELO L.; OLIVEIRA NETO, ALMIR; SANTOS, MAURO C.