Browsing by Author "Corro, Grisel"
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Artículo An investigation of the catalytic abatement of emissions from the combustion of diesel/bioethanol blends(2010-12) Téllez Méndez, Nallely; Corro, Grisel; Bustillo Diaz, Mario Mauricio; Téllez Méndez, Nallely; 0000-0002-3605-5412; Bustillo Diaz, Mario Mauricio; 0000-0001-5459-5589"In this study, we investigated the activity of pre-sulfated 1%Pt–2%Sn/γ–Al2O3 on the catalytic abatement of the combustion emissions of three fuels: pure diesel E(0), pure bioethanol E(100) and bioethanol blended diesel containing 10% bioethanol E(10). The emissions generated, by each blend combustion, were conducted continuously to the catalyst sample. The catalytic activity was determined by following the evolution of the outflow emissions concentrations by FTIR gas spectroscopy as a function of the catalyst temperature. Results showed that the addition of bioethanol to diesel may be necessary to enhance the catalytic oxidation of diesel unburned hydrocarbons and particulate matter on pre-sulfated 1%Pt–2%Sn/γ–Al2O3".Artículo Biodiesel from Jatropha curcas oil using Zn for esterification step and solar radiation as energy source(2012-07) Téllez Méndez, Nallely; Corro, Grisel; Bañuelos, Fortino; Eugenia Mendoza, María; Téllez Méndez, Nallely; 0000-0002-3605-5412; Eugenia Mendoza, María; 0000-0002-1947-7875"The production of biodiesel is greatly increasing due to its environmental benefits. However, production costs are still rather high compared to petroleum-based diesel fuel. In this investigation we report a production process that reduces the cost of biodiesel. The process proposed in this investigation, brings biodiesel production cost down due to the use of a solar heater as energy source to attain the reaction temperatures, the use of nonedible Jatropha curcas crude oil (JCCO) as raw material, and the use of low cost Zn filings as esterification catalyst".Artículo Biodiesel from waste frying oil. Two step process using acidified SiO2 for esterification step(2011-05-30) Téllez Méndez, Nallely; Corro, Grisel; Jiménez, Teresita; Tapia, Armando; Banuelos, Fortino; Vázquez Cuchillo, Odilón; Téllez Méndez, Nallely; 0000-0002-3605-5412; Jiménez, Teresita; 0000-0002-8772-0291; Vázquez Cuchillo, Odilón; 0000-0003-2677-7582"Biodiesel was produced from waste frying oil (WFO) by the two step catalyzed process. The free fatty acids (FFA) were first esterified with methanol catalyzed by SiO2 pretreated with HF. The catalyst was characterized by its acid surface sites, FTIR, SEM, and, its CO2 and H2O adsorption reactivity. This catalyst was easy to recover, was not hydrated or carbonated, was not dissolved by the reactants or the products of the reaction, showed a high activity for the FFA esterification and presented high stability. After 10 esterification runs, the catalyst activity remained unchanged. During the second step, the triglycerides in WFO were transesterified with methanol catalyzed by NaOH. The biodiesel obtained was characterized by its physical properties and its chemical composition. Gas chromatography and mass spectrometry analysis revealed that the process proposed in this investigation led to a biodiesel containing 96% methyl esters".Artículo Biodiesel production from Jatropha curcas crude oil using ZnO/SiO2 photocatalyst for free fatty acids esterification(2013-01-17) Téllez Méndez, Nallely; Corro, Grisel; Pal, Umapada; Téllez Méndez, Nallely; 0000-0002-3605-5412"We report the production of biodiesel from Mexican Jatropha Curcas crude oil (JCCO) by a two step catalytic process. The high content of free fatty acids (FFA) present in JCCO was first esterified with methanol by a photocatalytic process under UV irradiation using ZnO/SiO2 as the heterogeneous photocatalyst. The solid catalyst was found to be highly active for the heterogeneous photocatalyic esterification of FFA with methanol. The activity of the solid catalyst remained unchanged even after 10 esterification runs, indicating that the heterogeneous photocatalysis is a viable option for FFA esterification reactions for biodiesel production. Transesterification step was catalyzed by NaOH through thermal activation process. Produced biodiesel fulfills all the international requirements for its utilization as a fuel. A probable reaction mechanism for the esterification process is proposed considering the generation of H+, CH3O· and R-COOHradical dot on the photocatalyst surface".Artículo Two-step biodiesel production from Jatropha curcas crude oil using SiO2·HF solid catalyst for FFA esterification step(2010-10) Téllez Méndez, Nallely; Corro, Grisel; Ayala, Edgar; Marinez Ayala, Alma; Téllez Méndez, Nallely; 0000-0002-3605-5412"A high quality biodiesel was produced from Mexican Jatropha curcas crude oil (JCCO) by a two step catalyzed process. The free fatty acids (FFA) were first esterified with methanol, catalyzed by a solid catalyst: SiO2 pretreated with HF. The catalyst showed a high number of Lewis acid surface sites, and no CO2 or H2O adsorption activity. This catalyst showed a high FFA esterification activity and high stability. After 30 esterification runs, the catalyst activity remained unchanged. During the second step, the triglycerides present in the JCCO were transesterified with methanol catalyzed by NaOH. The chromatographic analysis of the biodiesel obtained, revealed that the process proposed in this investigation led to a very high quality biodiesel, meeting the international requirements for its utilization as a fuel. The combustion gas emissions of the JCCO biodiesel were studied by FTIR spectroscopy using a laboratory combustor. These preliminary results showed low amounts of aromatic and sulfur containing compounds. However, halogenated compounds and dicyclopentadiene were also detected at the combustor".