Navegando por Autor "Paula, Fabiano Gomes Ferreira de"
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Item Alcoxycle : a novel route for glycerol reform into H2 and COx inseparate stages.(2016) Paula, Fabiano Gomes Ferreira de; Rosmaninho, Marcelo Gonçalves; Teixeira, Ana Paula de Carvalho; Souza, Patterson Patrício de; Lago, Rochel MonteroIn this paper, it is proposed a new route, named “Alkoxycle”, for the conversion of glycerol from biodieselproduction into H2and CO/CO2in different and separate stages. In this process, glycerol first reacts withNaOH to form an alkoxide that, in a second step, undergoes controlled thermal decomposition. Analysesof glycerol:NaOH precursor mixtures (molar ratios of 1:1, 1:2, 1:3 and 1:5) by TG, XRD, SEM, TEM, Raman,total carbon and GC–MS showed that the decomposition of the alkoxide at 400◦C leads to the formationof three fractions: liquid, gas and solid. The liquid products were formed only in very small amountswhereas an important gas fraction (12–16 wt%) was produced consisting mainly of H2(95% selectivity).In the second stage, the solid products (70–86 wt%) consisting of Na2O, carbon and mostly Na2CO3canbe decompose by heating at 700◦C to procuce CO2and especially CO. At the end of the Alcoxycle process,the NaOH used in the reaction and also the NaOH present in the biodiesel glycerol can be recovered andreused.Item Conversion of fatty acids into hydrocarbon fuels based on a sodiumcarboxylate intermediate.(2016) Perígolo, Deise Morone; Paula, Fabiano Gomes Ferreira de; Rosmaninho, Marcelo Gonçalves; Souza, Patterson Patrício de; Lago, Rochel Montero; Araujo, Maria HelenaIn this work, it was investigated the conversion of fatty acids into hydrocarbon based on the reaction withNaOH followed by a controlled thermal decomposition. FTIR, Raman, UV–vis, XRD, TG-MS, SEM/TEM, CHN,GC–MS showed that precursors based on NaOH/oleic acid (molar ratios 0.7, 1.0, 1.5 and 2.0) decomposedat 550◦C to produce three fractions, i.e. liquid (5–37 wt%), gas (52–70 wt%) and solid (10–31 wt%). Theliquid fraction was composed of a complex mixture containing mainly aromatic compounds. On the otherhand, the major gas fraction showed a remarkable selectivity for propane (56–61 wt%) with some C1, C2,C4, H2and COx. The solid fraction showed the presence of Na2CO3, Na2O and particles of amorphousand graphene like carbon. Upon treatment at 800◦C the carbonate decomposes to CO2, oxidizes thecarbon and regenerated the Na2O which can potentially be used for a new reaction cycle. These resultsare preliminary discussed in terms of a catalytic effect of the basic sodium oxide to promote cracking,dehydrogenation and H-transfer reactions.Item Thermal cracking of oleic acid promoted by iron species from iron ore tailings for the production of ketones and fuels.(2022) Luciano, Vivian Andrade; Paula, Fabiano Gomes Ferreira de; Pinto, Paula Sevenini; Prates, Caroline Duarte; Pereira, Rafael César Gonçalves; Ardisson, José Domingos; Rosmaninho, Marcelo Gonçalves; Teixeira, Ana Paula de CarvalhoIron ore tailings (IOT) are rich in iron oxides and silica and can be used for different applications such as allow the thermal cracking of fatty acids for the production of fuels and products with high added value. Thus, this work aimed to use of IOT as an iron source for the production of high-value products using oleic acid (OA) as carbon sources. These compounds were produced from a thermal decomposition reaction, from the mixture of OA and IOT, in a high pressure reactor (12.5 bar), using the ratio of 1:1 wt (acid:IOT), in temperatures between 250 and 450 ◦C (3 and 12 h). The results showed that for all reactions, the solid products obtained showed a percentage of less than 6 % of carbon material and different iron phases (Fe2O3, Fe3O4 and FeOOH). For the reactions carried out at 250 and 350 ◦C/3h the main fraction obtained was the liquid, however the compostion was mainly the starting compound and iron oleate. For the reactions carried out at 400 and 450 ◦C/3h, the main fraction was gas, mainly hydrogen. For the reaction carried out at 350 ◦C for 12 h the mass balance showed the formation of similar amounts of liquid and gaseous products. Liquid products formed ketones as the main product, while gaseous products were identified and presented greater selectivity for C3 hydrocarbons.