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Síntese e propriedades de sílicas híbridas contendo surfactantes catiônicos
(Universidade Federal de São Carlos, 2015-09-21)
The control of pore geometry and pore diameter of silica mesoporous materials is
necessary for application of these materials, mainly in industrial process that depends on the shape selectivity. This way, considerable ...
Estudo de catalisadores de cobre suportados para a reação de oxidação preferencial do CO
(Universidade Federal de São Carlos, 2010-06-30)
The CO preferential oxidation reaction (PROX-CO) has been widely studied in last few years. Aiming H2 purification for proton-exchange membrane cells (PEMFC) use, the main role of the PROX-CO reaction should be reduce the ...
Nanopartículas de Pt suportadas em Al2O3 e CeO2-Al2O3: síntese e caracterização de catalisadores aplicados à reação de deslocamento gás-água
(Universidade Federal de São Carlos, 2011-04-28)
Colloidal Pt nanoparticles were synthesized according to an adapted procedure from Song and co-workers [1], which it was based on the reduction of dihydrogen hexachloroplatinate by ethylene glycol in a basic solution, but ...
Estudo da preparação e das propriedades estruturais de catalisadores para a transformação do metano em gás de síntese e hidrocarbonetos
(Universidade Federal de São Carlos, 2010-06-15)
Pt catalysts supported on CeO2-La2O3-Al2O3, with different mixed oxide compositions, and CeO2-ZrO2-Al2O3, prepared using three different routes, were synthesized by sol gel technique. The samples were characterized using ...
Síntese e avaliação de sílica tipo M41S contendo cátions CTA em transesterificação catalítica
(Universidade Federal de São Carlos, 2010-08-13)
The investments in the biofuel production have increased a lot in the last years mainly because of smaller damages they cause to the environment in comparison with the derived conventional petroleum fuels. The reaction of ...
Hidrotalcitas de Ni-Mg-Al como precursores de catalisadores para produção de gás de síntese a partir de biogás
(Universidade Federal de São Carlos, 2010-07-29)
Catalysts obtained by thermal decomposition of the precursors with hydrotalcite-like structure [Mg1-xAlx (OH)2]x+ [CO3]x/n. mH2O and [Ni1-x Mg1-xAlx (OH)2]x+ [CO3]x/n. mH2O were prepared, characterized and tested in the ...
Síntese e propriedades da zeólita FAU com cristais nanométricos
(Universidade Federal de São Carlos, 2010-07-21)
The FAU zeolite was obtained using different amounts of water. Both at higher levels as the lowest amount of water the intensities of the diffraction peaks are less intense. The results of physisorption of these samples ...
Síntese da sílica MCM-41 usando um surfactante catiônico polimerizável e avaliação na transesterificação catalítica
(Universidade Federal de São Carlos, 2014-02-20)
The masters work presented is result of a great effort provided by the group, which has worked with changes in the synthesis of CTA-MCM-41. The synthesis of the M41S family (composed of mesoporous silica MCM-41, MCM-48 and ...
Efeito das condições de preparação da [CTA+]-SiMCM-41 na atividade da transesterificação
(Universidade Federal de São Carlos, 2010-02-26)
The hybrid [CTA+]-SiMCM-41 mesoporous material (where CTA+ is the cetyltrimethylammonium cation) was employed as synthesized in the transesterification reaction between ethyl acetate and methanol. This is a model reaction ...
Catalisadores bimetálicos Pt-Fe/CeO2 para a reação de oxidação preferencial do CO
(Universidade Federal de São Carlos, 2010-03-31)
The objective of this work is to study the preferential oxidation (PROX) of carbon monoxide in H2-rich feed streams over Pt-Fe/CeO2 catalysts in a feed gas composed of 3% CO, 1.5% O2, 80% H2, and N2 (for balance). The ...