TEDE Coleção: Programa de Pós-Graduação em BioenergiaPrograma de Pós-Graduação em Bioenergiahttp://tede.unicentro.br:8080/jspui/handle/tede/5552026-04-26T01:15:40Z2026-04-26T01:15:40ZAVALIAÇÃO DO USO DE ELETRODO DE AÇO 254 E FILME TIO2 NA PRODUÇÃO DE HIDROGÊNIO EM SOLUÇÕES DE ÁCIDO FÓRMICO E ÁGUAS RESIDUAISHagemann, Eduarda Carolina Schererhttp://tede.unicentro.br:8080/jspui/handle/jspui/22412024-07-10T18:29:27Z2024-03-22T00:00:00ZTítulo: AVALIAÇÃO DO USO DE ELETRODO DE AÇO 254 E FILME TIO2 NA PRODUÇÃO DE HIDROGÊNIO EM SOLUÇÕES DE ÁCIDO FÓRMICO E ÁGUAS RESIDUAIS
Autor: Hagemann, Eduarda Carolina Scherer
Primeiro orientador: Gallina, André Lazarin
Abstract: Hydrogen is a clean fuel, which has been touted as an energy alternative for countries seeking to reduce carbon dioxide emissions. Despite being the most abundant element on Earth, protein is not found in isolation in nature and must be produced from a raw material that contains it. One of the main raw materials used in the production of hydrogen in the world is fossil fuels, especially coal and natural gas. In some countries, such as the United States, catalytic reforming of methane is also widely used. Although the production of hydrogen from natural gas is the most used route, water electrolysis is the most environmentally advantageous, being responsible for producing what is called green hydrogen, in which there are no CO2 emissions in the production process.
Aiming to expand hydrogen production through water electrolysis, one possibility would be to
use wastewater or aqueous waste solutions. Therefore, in this work, hydrogen production was carried out via electrolysis using shale wastewater, aqueous glycerol solution and aqueous formic acid solution, catalyzed by TiO2 microparticles. A simplex-centroid experimental design and desirability optimization was carried out to determine the optimal conditions for hydrogen production with these electrolyte solutions, using threads and without problems. As a result, it was obtained that the best condition to produce hydrogen would be using a mixture of 80% of 3 molL-1 aqueous formic acid solution and 20% of glycerol aqueous solution as electrolyte solution. Hydrogen quantification in this condition indicated a maximum production of 0.035 mol in 1h in fact, applying -1.15 V overvoltage. Optimization in the study without findings indicated that the best condition for hydrogen production would be with 100% aqueous solution of 3 molL-1 formic acid as the electrolyte solution. In this case, 0.042 mol of hydrogen were produced in 120 minuts of occurrence. Regarding the production cost, it takes 43.42 R$ cm2 to produce 1 mole of hydrogen using TiO2 as findings. When not used, the cost is 47.86 R$ cm2 per mole. Therefore, we can conclude that the planning is efficient in reducing the costs of producing hydrogen via electrolysis and in contributing to energy expenditure.
Instituição: Universidade Estadual do Centro-Oeste
Tipo do documento: Dissertação2024-03-22T00:00:00ZBioetanol de segunda geração produzido a partir da biomassa de Eichhornia crassipes via hidrólise enzimática pelo fungo Grifola frondosaSouza, Maria Cristinahttp://tede.unicentro.br:8080/jspui/handle/jspui/22352024-06-17T16:01:21Z2024-04-29T00:00:00ZTítulo: Bioetanol de segunda geração produzido a partir da biomassa de Eichhornia crassipes via hidrólise enzimática pelo fungo Grifola frondosa
Autor: Souza, Maria Cristina
Primeiro orientador: Furstenberger, Cynthia Beatriz
Abstract: The biomass of Water Hyacinth (Eichhornia crassipes) shows promising potential for energy generation due to its renewable and abundant nature and its lignocellulosic chemical composition. Additionally, it serves as a phytoremediation plant for effluent treatment, allowing it to be cultivated in various environments without competing with the food industry, including sewage treatment plants. By utilizing this type of biomass, value is added to what was once
considered waste, now regarded as an energy resource. This study aimed to compare the effects of chemical pretreatments with solutions of HCl and NaOH, both at a concentration of 0.5 mol·L⁻¹, and H₂O₂ at 3% (v/v) with pH adjusted to 11.5, in the proportions of 100 mL of solution per 5g of water hyacinth biomass. This was done through enzymatic hydrolysis performed by the fungus Grifola frondosa after 7, 14, 21, and 28 days of growth in a microbiological incubator at
25°C, and the fermentation process carried out with 10 mL of Escherichia coli bacteria previously cultured in liquid medium and 1g of commercial yeast Saccharomyces cerevisiae, both for each
100 mL of must. According to the methodologies used, it was found that chemical pretreatments had a positive influence on the biomass, as the best result obtained through this method was
77.6% with HCl after 7 days of hydrolysis and fermentation by the bacteria. In contrast, without chemical pretreatments and without the influence of hydrolysis, the highest alcohol content obtained was only 51.2% for leaves and stems fermented with E. coli, which already confers it potential application as a sanitizer. The density values were above the permissible limits, while the pH values ranged from 5.5 to 9.0, with most falling within the acceptable limits, as did the
color and visual appearance, which met the requirements for all samples.
Instituição: Universidade Estadual do Centro-Oeste
Tipo do documento: Dissertação2024-04-29T00:00:00ZESTUDO DA REDUÇÃO DO TEOR DE ACIDEZ DE ÓLEO ALTERNATIVO VIA MÉTODO ELETROQUÍMICO, VISANDO A PRODUÇÃO DE BIODIESELLÜNEBURGER, Sarahttp://tede.unicentro.br:8080/jspui/handle/jspui/22342024-06-17T12:25:30Z2024-05-13T00:00:00ZTítulo: ESTUDO DA REDUÇÃO DO TEOR DE ACIDEZ DE ÓLEO ALTERNATIVO VIA MÉTODO ELETROQUÍMICO, VISANDO A PRODUÇÃO DE BIODIESEL
Autor: LÜNEBURGER, Sara
Primeiro orientador: Gallina, André Lazarin
Abstract: Biodiesel is a very important biofuel for the energy transition and the decarbonization process. However, biodiesel production is dependent on raw materials that are commodities, compete with the food industry and reach high market prices, such as soybeans. In order to increase the production and consequent use of biodiesel, it is necessary to have a supply chain, however, some potential oils and fats have high acidity, a characteristic that prevents the reaction widely used in the industry, transesterification, from occurring properly. The present work developed a treatment technique for high acidity oils (60 to 90 mgKOH/g), using electrolysis and sulfuric acid catalyst, with steel and graphite electrodes, obtaining the best result of 96.07% reduction with the use of graphite electrode, with 62.5% ester content. A study on the efficiency of electrode reuse was then carried out, and both electrodes did not show significant drops in efficiency during continuous use. To reach the level required for commercialization of 96.5% ester content, a biodiesel production study was carried out
(using the oils treated in the previous stage) with and without electrolysis, with acid and alkaline catalyst from the treated oil , and based on the results it was evident that it is better to conduct the second stage without electrolysis and with an alkaline catalyst, achieving an ester content of 98.52% with the lowest amount of methanol (1:9, oil:methanol M:M) studied. Finally, an economic analysis was carried out, where it was found that the treatment using electrolysis provides savings of almost 3 times, when compared to the traditional method of reducing the acidity of the oil. In this way, it was possible to contribute to the development of a low-cost and high-efficiency process, enabling the insertion of high acidity oils into the biodiesel market and the consequent diversification of raw materials.
Instituição: Universidade Estadual do Centro-Oeste
Tipo do documento: Dissertação2024-05-13T00:00:00ZProdução de células solares de TiO2/Nb sensibilizadas com corantes naturaisOLIVEIRA, MARCEL RICARDO NOGUEIRA DEhttp://tede.unicentro.br:8080/jspui/handle/jspui/21402024-02-02T03:30:58Z2022-06-02T00:00:00ZTítulo: Produção de células solares de TiO2/Nb sensibilizadas com corantes naturais
Autor: OLIVEIRA, MARCEL RICARDO NOGUEIRA DE
Primeiro orientador: Gallina, André Lazarin
Abstract: Dye sensitized solar cells (DSSC) are promisors devices for solar energy conversion.
They are produced by the use of a semiconductor oxide and photosensitive material. To
improve the photoconversion energy efficiency, a mix of oxides is applied and dyes
extracted from natural products can be used when the objective is to produce a low-cost
system. This work aims to develop and evaluate a DSSC with Ti and Nb sensitized with
dyes extracted from Capsicum Anuum and Curcuma Longa. For the inorganic analysis,
Scanning Electron Microscopy (SEM), X-ray Fluorescence (XRF), and X-ray Diffraction
(XRD) will be used. To electrochemical analysis, j-V curves, photochronoamperometic
measurement (j-t), and Open Circuito Potential (OCP) will be performed. As a result of
the corresponding partial analyzes during the oxide synthesis, it was observed that is
possible to produce Ti/Nb particles by the Pechini methodology, with high crystallinity
and mix of rutile and anatase forms. Electrochemical results showed an improving in
photoconversion energy cell efficiency with 25% to Curcuma longa and 12% to Capsium
Anuum when Nb was inserted.
Instituição: Universidade Estadual do Centro-Oeste
Tipo do documento: Dissertação2022-06-02T00:00:00Z