ELIZABETH SEBASTIANA RIBEIRO SOMESSARI

ELIZABETH SEBASTIANA RIBEIRO SOMESSARI

Página do item completo

Resultados de Busca

Agora exibindo 1 - 10 de 24

AuCu/TiO2 catalysts prepared using electron beam irradiation for the preferential oxidation of carbono monoxide in hydrogen-rich mixtures
2019 - ALENCAR, CATARINE S.L.; PAIVA, ANA R.N.; SILVA, LEONARDO G. de A. e; SOMESSARI, ELIZABETH S.R.; VAZ, JORGE M.; SPINACE, ESTEVAM V.
The major part of the world production of hydrogen is originated from a combination of methane steam reforming and water gas shift reaction resulting in a n H 2 rich mixture known as reformate gas, which contains about 1% vol (10, 000 p pm) of carbon monoxide (CO). The preferential oxidation reaction of CO in H 2 rich mixtures (CO PROX) has been considered a very promising process for H 2 purification, reducing CO for values below 50 ppm allowing its use in Proton Exchange Membrane Fuel Cells (PEMFC). Au nanopart icles supported on TiO 2 (Au/TiO 2 ) catalysts have been shown good activity and selectivity for CO PROX reaction in the temperature range between 20 ºC and 80 ºC; however, the catalytic activity strongly depend s on the preparation method. Also, the addition of Cu to the Au/TiO 2 catalyst could increase the activity and selectivity for CO PROX reaction. In this work, AuCu/TiO 2 catalysts with composition 0.5%Au0. 5%Cu/TiO 2 were prepared in a single step using electron beam irradiation, where the Au 3+ and Cu 2+ ion s were dissolved in water/2 propanol solution , the TiO 2 support was dispersed and the obtained mixture was irradiated under stirring at room temperature using different dose rates ( 8 64 kGy s 1 ) and doses 144 576 kGy The catalysts were characterized by energy dispersive X ray analysis (EDX), X ray diffraction (XRD), transmissi on electron microscopy (TEM), temperature programmed reduction (TPR) and tested for CO PROX reaction In the studied conditions, it was observed that the increase of t he dose rate and the total dose contributed to a decrease in the mean nanoparticle sizes. The best result was obtained with a catalyst prepared with a dose rate of 64 kGy s 1 and a dose of 576 kGy showed a CO conversion of 45% and a CO 2 selectivity of 30% at 150 o C.
A dosimetric survey of the DC1500/25/04 electron beam plant installed at IPEN-CNEN/SP
2015 - KUNTZ, FLORENT; SOMESSARI, ELIZABETH S.R.; SILVEIRA, CARLOS G. da; BUENO, CARMEN C.; CALVO, WILSON A.P.; NAPOLITANO, CELIA M.; GONCALVES, JOSEMARY A.C.; SOMESSARI, SAMIR L.
Needs and emerging opportunities of electron beam accelerators on radiation processing technology for industrial and environmental application in South America
2009 - CALVO, W.A.P.; DUARTE, C.L.; MACHADO, L.D.B.; PINO, E.S.; POLI, D.C.R.; MANZOLI, J.E.; TOBIAS, C.C.B.; MATHOR, M.B.; SOMESSARI, E.S.R.; SILVEIRA, C.G.; SOMESSARI, S.L.; OMI, N.M.; RELA, P.R.
Electron beam accelerator facilities at IPEN-CNEN/SP
2007 - SOMESSARI, SAMIR L.; SILVEIRA, CARLOS G. da; PAES, HELIO; SOMESSARI, ELIZABETH S.R.
Analysis of the power system from an alectron beam accelerator and the correlation with the theoretical dosimetry for radiation processing
2013 - SOMESSARI, SAMIR L.; SOMESSARI, ELIZABETH S.R.; SILVEIRA, CARLOS G. da; CALVO, WILSON A.P.
Estudo da radiodegradacao dos compostos organicos odorificos geosmina e metilisoborniol presentes em agua do sistema Guarapiranga
2002 - DUARTE, C.L.; SAKAGAMI, M.K.; MAUTONE, C.A.; SAMPA, M.H.O.; BORRELY, S.I.; SOMESSARI, E.S.
Comparision of dosimetric mapping of radiation induced skin ulcer animal model in nud mice and wistar rat
2013 - ALVES, NELSON M.; MOSCA, RODRIGO C.; FERREIRA, DANILO C.; SOMESSARI, ELIZABETH S.R.; SILVEIRA, CARLOS G. da; DORNELLES, LEONARDO D.P.; BUENO, CARMEN C.; MATHOR, MONICA B.
Evaluation of the effect of radiation levels and dose rates in irradiation of murine fibroblasts used as a feeder layer in the culture of human keratinocytes
2009 - YOSHITO, DANIELE; ALMEIDA, TIAGO L.; SANTIN, STEFANY P.; SOMESSARI, ELIZABETH S.R.; SILVEIRA, CARLOS G.; ALTRAN, SILVANA C.; ISAAC, CESAR; HERSON, MARISA R.; MATHOR, MONICA B.
Electron beam irradiation and zeolites adsorption applied to dyeing effluents
2007 - HIGA, MARCELA C.; FUNGARO, DENISE A.; SOMESSARI, ELIZABETH S.R.; MAGDALENA, CARINA P.; GROSCHE, LUCAS C.; NETO, ANTONIO C.N.; BORRELY, SUELI I.
Processo de oxidacao avancada por feixe de eletrons no tramento de efluentes industriais e na recuperacao do meio ambiente
2003 - DUARTE, C.L.; SAMPA, M.H.O.; OIKAWA, H.; BORRELY, S.I.; SOMESSARI, E.S.; RELA, P.R.