Search Results - "DIAS, Silvia C. L"

Tuning the Biginelli reaction mechanism by the ionic liquid effect: the combined role of supported heteropolyacid derivatives and acidic strength by Freitas, Elon F, Souza, Roberto Y, Passos, Saulo T. A, Dias, José A, Dias, Silvia C. L, Neto, Brenno A. D

“…Herein, a combination of heteropolyacids and ionic liquids as a catalytic system was studied for the Biginelli multicomponent reaction; the positive ionic…”
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Analytical evaluation of BEA zeolite for the pre-concentration of polycyclic aromatic hydrocarbons and their subsequent chromatographic analysis in water samples by Wilson, Walter B., Costa, Andréia A., Wang, Huiyong, Dias, José A., Dias, Sílvia C.L., Campiglia, Andres D.

“…[Display omitted] ► BEA zeolite is used to pre-concentrate polycyclic aromatic hydrocarbons from water samples. ► The pre-concentration obtained with BEA have…”
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Phase transition in niobium pentoxide supported on silica-alumina by Braga, V. S., Garcia, F. A. C., Dias, J. A., Dias, Sílvia C. L.

“…Nb 2 O 5 supported on SiO 2 -Al 2 O 3 were prepared with a wide loading range (2, 5, 10, 15, 20 and 25 mass%) and analyzed by simultaneous thermogravimetric…”
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Acidic characterization of copper oxide and niobium pentoxide supported on silica-alumina by GARCIA, Fillipe A. C, BRAGA, Valdeilson S, SILVA, Junia C. M, DIAS, José A, DIAS, Silvia C. L, DAVO, Jorge L. B

“…Copper oxide and niobium pentoxide were supported on silica–alumina with 2, 5, 10, 15 and 25 mass% loadings and 1:1 mass ratio of CuO:Nb2O5. XRD and BET…”
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Investigation of biodiesel production by HUSY and Ce/HUSY zeolites: Influence of structural and acidity parameters by Borges, Luciana D., Moura, Nayara N., Costa, Andréia A., Braga, Patrícia R.S., Dias, José A., Dias, Sílvia C.L., de Macedo, Julio L., Ghesti, Grace F.

“…[Display omitted] ► HUSY and Ce/USY zeolites were active catalysts for biodiesel production. ► Impregnation with cerium leads to an acid and structural…”
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Dehydration of Fructose to 5-Hydroxymethylfurfural: Effects of Acidity and Porosity of Different Catalysts in the Conversion, Selectivity, and Yield by Lima, João Pedro Vieira, Campos, Pablo Teles Aragão, Paiva, Mateus Freitas, Linares, José J., Dias, Sílvia C. L., Dias, José A.

“…There is a demand for renewable resources, such as biomass, to produce compounds considered as platform molecules. This study deals with dehydration of…”
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Benzene transalkylation with C9+ aromatics over supported 12-tungstophosphoric acid on silica catalysts by Dias, José A., Rangel, Maria do Carmo, Dias, Sílvia C.L., Caliman, Ednéia, Garcia, Fillipe A.C.

“…H 3PW 12O 40/SiO 2 (8–25 wt.%) were prepared and evaluated in benzene transalkylation with C9+ aromatics. The activity and selectivity to xylenes changed with…”
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Lewis acid/surfactant rare earth trisdodecylsulfate catalysts for biodiesel production from waste cooking oil by de Mattos, Flávia C.G., da S. de Souza, Joina A., do A. Cotrim, Ana B., de Macedo, Julio L., Dias, José A., Dias, Sílvia C.L., Ghesti, Grace F.

“…[Display omitted] ► Synthesis of rare earth trisdodecylsulfate Lewis acid-surfactant-combined catalysts. ► Production of biodiesel from waste cooking oil. ►…”
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Pt Electrocatalyst Prepared by Hydrothermal Reduction onto the Gas Diffusion Layer for High-Temperature Formic Acid and Ethanol Fuel PEMFC by Rayane da Silva Cardoso, Bruna Sartório de Castro, Sophya de Andrade Dias, Maria Clara H. Clemente, Sílvia C. L. Dias, José A. Dias, Rudy Crisafulli, José J. Linares, Gesley A. Veloso Martins

“…An alternative method for the preparation of PEMFC electrodes is presented in this work based on the direct deposition of Pt particles onto the gas diffusion…”
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Esterification of oleic acid with ethanol by 12-tungstophosphoric acid supported on zirconia by Oliveira, Claudinei F., Dezaneti, Luiz M., Garcia, Fillipe A.C., de Macedo, Julio L., Dias, José A., Dias, Sílvia C.L., Alvim, Kayne S.P.

“…Supported H 3PW 12O 40 on zirconia (5–60 wt%) was prepared by impregnation, characterized, and applied in the esterification reaction of oleic acid with…”
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Comparative adsorption studies of indigo carmine dye on chitin and chitosan by Prado, Alexandre G.S, Torres, Jocilene D, Faria, Elaine A, Dias, Sı́lvia C.L

“…The adsorption of indigo carmine dye onto chitin and chitosan from aqueous solutions was followed in a batch system. The ability of these materials to adsorb…”
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Immobilization of Fe, Mn and Co tetraphenylporphyrin complexes in MCM-41 and their catalytic activity in cyclohexene oxidation reaction by hydrogen peroxide by Costa, Andréia A., Ghesti, Grace F., de Macedo, Julio L., Braga, Valdeilson S., Santos, Marcello M., Dias, José A., Dias, Sílvia C.L.

“…Synthesis, characterization and application of three metalloporphyrin catalysts (FeTPPCl, MnTPPCl and CoTPP, where TPP = tetraphenylporphyrin) anchored on…”
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Preparation and characterization of H3PW12O40 supported on niobia by CALIMAN, Ednéia, DIAS, José A, DIAS, Silvia C. L, GARCIA, Fillipe A. C, DE MACEDO, Julio L, ALMEIDA, Liana S

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Accessibility and strength of H-acceptor hydroxyls of ordered mesoporous silicas probed by pyridine donor by Alves, Mayara R., Paiva, Mateus F., Campos, Pablo T. A., de Freitas, Elon F., Clemente, Maria Clara H., Martins, Gesley Alex V., Silveira, Alceu T., da Silva, Luis C. Cides, Fantini, Marcia C. A., Dias, Sílvia C. L., Dias, José A.

“…Ordered mesoporous silica (OMS) is an important and useful material for a variety of applications, including catalysis, adsorption, sensing and controlled drug…”
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Effects of preparation and structure of cerium-zirconium mixed oxides on diesel soot catalytic combustion by Oliveira, Claudinei F., Garcia, Fillipe A.C., Araújo, Daniel R., Macedo, Julio L., Dias, Sílvia C.L., Dias, José A.

“…[Display omitted] ► Preparation of nanostructured materials. ► Mixed oxides of cerium-zirconium have distorted structures from cubic ceria. ► Raman spectra…”
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Indirect Determination of Dichlorodiphenyltrichloroethane (DDT) After Dechlorination with Magnesium/Palladium Bimetallic Particles and Potentiometric Measurements by Estrela, Maria Amélia A., SouzaDe, Jurandir R., Dias, Sílvia C. L., Dórea, José G.

“…Determination of chlorine ions of pesticides was performed after dechlorination reaction using a palladium/magnesium system. Chlorine ions were quantified by…”
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Comparison of BEA, USY and ZSM-5 for the quantitative extraction of polycyclic aromatic hydrocarbons from water samples by Costa, Andréia A., Wilson, Walter B., Wang, Huiyong, Campiglia, Andres D., Dias, José A., Dias, Sílvia C.L.

“…[Display omitted] ► Zeolites were compared for water removal of polycyclic aromatic hydrocarbons. ► Compound extraction mainly occurs via adsorption to zeolite…”
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Synthesis of poly(lactic acid) by heterogeneous acid catalysis from d,l-lactic acid by Chafran, Liana S., Campos, Jonas M. C., Santos, Joicy S., Sales, Maria José A., Dias, Sílvia C. L., Dias, José A.

“…Poly(lactic acid) (PLA) is an important polymer because of its significant biocompatibility and biodegradability. Supported H 3 PW 12 O 40 (H 3 PW) on…”
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Liquid phase calorimetric-adsorption analysis of Si-MCM-41: Evidence of strong hydrogen-bonding sites by Braga, Patricia R.S., Costa, Andréia A., de Macedo, Julio L., Ghesti, Grace F., de Souza, Mônica P., Dias, José A., Dias, Sílvia C.L.

“…One-site model was obtained by donor–acceptor adsorption and calorimetric analysis of pyridine for three adjacent silanol groups hydrogen-bonding to each other…”
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Mixed salts of cesium and ammonium derivatives of 12-tungstophosphoric acid: Synthesis and structural characterization by Santos, Joicy S., Dias, José A., Dias, Sílvia C.L., Garcia, Fillipe A.C., Macedo, Julio L., Sousa, Flávia S.G., Almeida, Liana S.

“… [Display omitted] ▶ New salts of cesium and ammonium derivatives of H 3PW 12O 40 were synthesized by precipitation. ▶ The properties of the mixed salts…”
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