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Permanent URI for this collectionhttps://dspace.ucuenca.edu.ec/handle/123456789/45860

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Design and development of a catalytic fixed-bed reactor for gasification of banana biomass in hydrogen production
(2022) Tacuri Sarmiento, Diego Mauricio; Andrade Herrera, Christian Javier; Álvarez Lloret, Edgar Paúl; Abril González, Mónica Fernanda; Salamea Piedra, Teresita Silvana; Pinos Vélez, Verónica Patricia; Jara Cobos, Lourdes Elizabeth; Montero Izquierdo, Iván Andrés
Hydrogen produced from biomass is an alternative energy source to fossil fuels. In this study, hydrogen production by gasification of the banana plant is proposed. A fixed-bed catalytic reactor was designed considering fluidization conditions and a height/diameter ratio of 3/1. Experimentation was carried out under the following conditions: 368 °C, atmospheric pressure, 11.75 g of residual mass of the banana (pseudo-stem), an average particle diameter of 1.84 mm, and superheated water vapor as a gasifying agent. Gasification reactions were performed using a catalyzed and uncatalyzed medium to compare the effectiveness of each case. The catalyst was Ni/Al2O3, synthesized by coprecipitation. The gas mixture produced from the reaction was continuously condensed to form a two-phase liquid–gas system. The synthesis gas was passed through a silica gel filter and analyzed online by gas chromatography. To conclude, the results of this study show production of 178 mg of synthesis gas for every 1 g of biomass and the selectivity of hydrogen to be 51.8 mol% when a Ni 2.5% w/w catalyst was used. The amount of CO2 was halved, and CO was reduced from 3.87% to 0% in molar percentage. Lastly, a simulation of the distribution of temperatures inside the furnace was developed; the modeled behavior is in agreement with experimental observations.
Kinetic Study of Acid Hydrolysis of the Glucose Obtained from Banana Plant
(2023) Abril González, Mónica Fernanda; Vele Salto, Angelica Maria; Pinos Vélez, Verónica Patricia
The biomass of crops in rotation, such as that generated by the banana plant, is an interesting source of lignocellulose due to its composition and availability. This research aimed to compare the amount of glucose obtained from different parts of the banana plant (leaves, rachis, and pseudostem) by hydrolysis with sulfuric acid at 100 °C. This reaction was analyzed to determine the amount of water and reagents consumed versus the glucose obtained. The optimal time and acid concentration were studied between 0–30 min and 3–5% v/v, respectively. The best results were obtained with the pseudostem of 13.02 gL−1 of glucose in a reaction time of 20 min and an acid concentration of 5%. In addition, the kinetic study of hydrolysis was carried out. The adjustment to the Saeman model was R2 0.96, which represents a first-order reaction and kinetic constants K1 = 0.5 and K2 = 0.3 min−1. This study has shown that these residues can be used as raw materials to generate value-added products due to their high glucose content
Mini revisión: aplicación de líquidos iónicos en hidrólisis ácida dematerial lignocelulósico para la obtención de azúcares
(2021) Salamea Piedra, Teresita Silvana; Vele Salto, Angélica María; Pinos Vélez, Verónica Patricia; Abril González, Mónica Fernanda
In recent decades, the application of ionic liquids (IL) as pretreatment of residual biomass (BM) before the hydrolysis reaction hasproven to be an efficient system to improve yields towards obtaining monosaccharides. A greater recovery of monosaccharidestranslates into a higher yield in the production of biofuels, which can make this industry profitable. In this context, this bibliographicreview analyzes the physicochemical characteristics, synthesis methods, dissolution conditions with application of variables, suchas: IL: BM weigh ratio, temperature and time. In addition, a comparative assessment of the results of traditional acid hydrolysisprocesses with respect to those obtained with the application of IL is carried out, increasing in most cases their reaction yields.Finally, some recovery and recycling techniques are mentioned, which allow to reduce the costs of the process, so that it iseconomically profitable
Production of hydrogen from lignocellulosic biomass: a review of technologies.
(2023) Jara Cobos, Lourdes Elizabeth; Abril González, Mónica Fernanda; Pinos Vélez, Verónica Patricia
Hydrogen is considered one of the most important forms of energy for the future, as it can be generated from renewable sources and reduce CO2 emissions. In this review, the different thermochemical techniques that are currently used for the production of hydrogen from biomass from plantations or crops, as well as those from industrial or agro-industrial processes, were analyzed, such as gasification, liquefaction, and pyrolysis. In addition, the yields obtained and the reactors, reaction conditions, and catalysts used in each process are presented. Furthermore, a brief comparison between the methods is made to identify the pros and cons of current technologies

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Browsing Publicaciones by Author "Abril González, Mónica Fernanda"