RODRIGO FERNANDO BRAMBILLA DE SOUZA
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Artigo IPEN-doc 26619 Activation of methane on PdZn/C electrocatalysts in an acidic electrolyte at low temperatures2019 - NANDENHA, J.; NAGAHAMA, I.H.F.; YAMASHITA, J.Y.; FONTES, E.H.; AYOUB, J.M.S.; SOUZA, R.F.B. de; FONSECA, F.C.; NETO, A.O.PdZn/C electrocatalysts were prepared by sodium borohydride utilized as reducing agent for activation methane in an acidic medium at room temperature and in a proton exchange membrane fuel cell (PEMFC) at 80°C. The materials prepared were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The diffractograms of the PdZn/C electrocatalysts showed only peaks associated with Pd face-centered cubic (fcc) structure. Cyclic voltammograms (CV) of all electrocatalysts after adsorption of methane shown an increment in current during the anodic scan, this effect was more pronounced for Pd(70)Zn(30)/C. In situ ATR-FTIR (Attenuated Total Reflectance-Fourier Transform Infrared) experiments was not observed the formation of intermediates adsorbed for PdZn/C electrocatalysts, this behavior indicated that the methane oxidation occurs by parallel mechanisms. Polarization curves at 80°C in PEMFC show that Pd(90)Zn(10)/C has superior performance over the other electrocatalysts in methane oxidation.Artigo IPEN-doc 26482 Partial oxidation of methane and generation of electricity using a PEMFC2019 - NANDENHA, J.; PIASENTIN, R.M.; SILVA, L.G.M.; FONTES, E.H.; NETO, A.O.; SOUZA, R.F.B. deThe aim of this work was to produce methanol through partial oxidation of methane. The gas fed in a solid membrane reactor- PEM fuel cell type (H2/H2O2 + CH4) has been used for electrosynthesis of methanol at room temperature, with electricity cogeneration as a benefit. It was observed that the current density measured when injected CH4 in the cathode decreased about 45%. This occurs due to the conversion of methane inmethanol in some ranges of potentials. In the other hand, in lower ranges of cell potential, formaldehyde was found. In this work, methane was injected on the cathode together with H2O2 solution, where it was observed that the catalytic layer adsorbed CH4 and H2O2 in active sites, which produced OH− radicals that reacted with the hydrocarbon.Resumo IPEN-doc 20217 O efeito da concentração de etanol na performance e na distribuição de produtos em uma DEFC: um estudo utilizando o acessório DEFC/ATR-FTIR2014 - ASSUMPCAO, MONICA H.M.T.; NANDENHA, JULIO; BUZZO, GUILHERME S.; SILVA, JULIO C.M.; SPINACE, ESTEVAM V.; NETO, ALMIR O.; SOUZA, RODRIGO F.B. deResumo IPEN-doc 19074 Estudo da oxidação de etanol sobre Pt usando ATR-FTIR em condições realistas de uma DEFC2013 - OLIVEIRA NETO, ALMIR; NANDENHA, JULIO; LINARDI, MARCELO; SPINACE, ESTEVAM V.; SOUZA, RODRIGO F.B. de