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ABOUT ME h5>
Currently at Universidad de Las Américas, Ecuador
http://investigacion.udla.edu.ec/udla_teams/katiuska-alexandrino/
PUBLICATIONS h5>
2022
Alexandrino, Katiuska; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
Experimental and simulation study of the high pressure oxidation of dimethyl carbonate Artículo de revista
En: Fuel, vol. 309, pp. 122154, 2022, ISSN: 0016-2361.
@article{Alexandrino2022,
title = {Experimental and simulation study of the high pressure oxidation of dimethyl carbonate},
author = {Katiuska Alexandrino and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1016/J.FUEL.2021.122154},
issn = {0016-2361},
year = {2022},
date = {2022-02-01},
urldate = {2022-02-01},
journal = {Fuel},
volume = {309},
pages = {122154},
publisher = {Elsevier},
abstract = {An experimental and modeling study of the oxidation at high pressure of dimethyl carbonate (DMC) has been performed in a quartz tubular flow reactor. Experimental and simulated concentrations of DMC, CO, CO2 and H2 have been obtained for different temperatures (500–1073 K), pressures (20, 40, and 60 atm) and stoichiometries ($łambda$ = 0.7, 1, and 35). Both pressure and concentration of oxygen are important parameters for conversion of DMC. The simulations have been carried out using a detailed kinetic mechanism previously developed by the research group. In general, the model is able to reproduce the experimental trends of the different concentration profiles, although some discrepancies are observed between experimental and simulation results. The performance of the model was also evaluated through the simulation of literature data of the oxidation of DMC at atmospheric pressure in a flow reactor and of the DMC ignition delay times under low and high pressures. In this sense, this work contributes to the knowledge of the combustion process of DMC, by providing new experimental data on the conversion of DMC at high pressures and using a kinetic model for the interpretation of the results.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An experimental and modeling study of the oxidation at high pressure of dimethyl carbonate (DMC) has been performed in a quartz tubular flow reactor. Experimental and simulated concentrations of DMC, CO, CO2 and H2 have been obtained for different temperatures (500–1073 K), pressures (20, 40, and 60 atm) and stoichiometries ($łambda$ = 0.7, 1, and 35). Both pressure and concentration of oxygen are important parameters for conversion of DMC. The simulations have been carried out using a detailed kinetic mechanism previously developed by the research group. In general, the model is able to reproduce the experimental trends of the different concentration profiles, although some discrepancies are observed between experimental and simulation results. The performance of the model was also evaluated through the simulation of literature data of the oxidation of DMC at atmospheric pressure in a flow reactor and of the DMC ignition delay times under low and high pressures. In this sense, this work contributes to the knowledge of the combustion process of DMC, by providing new experimental data on the conversion of DMC at high pressures and using a kinetic model for the interpretation of the results.
Alexandrino, Katiuska; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
Experimental and simulation study of the high pressure oxidation of dimethyl carbonate Artículo de revista
En: Fuel, vol. 309, no October 2021, 2022, ISSN: 00162361.
@article{Alexandrino2022b,
title = {Experimental and simulation study of the high pressure oxidation of dimethyl carbonate},
author = {Katiuska Alexandrino and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1016/j.fuel.2021.122154},
issn = {00162361},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Fuel},
volume = {309},
number = {October 2021},
abstract = {An experimental and modeling study of the oxidation at high pressure of dimethyl carbonate (DMC) has been performed in a quartz tubular flow reactor. Experimental and simulated concentrations of DMC, CO, CO2 and H2 have been obtained for different temperatures (500–1073 K), pressures (20, 40, and 60 atm) and stoichiometries ($łambda$ = 0.7, 1, and 35). Both pressure and concentration of oxygen are important parameters for conversion of DMC. The simulations have been carried out using a detailed kinetic mechanism previously developed by the research group. In general, the model is able to reproduce the experimental trends of the different concentration profiles, although some discrepancies are observed between experimental and simulation results. The performance of the model was also evaluated through the simulation of literature data of the oxidation of DMC at atmospheric pressure in a flow reactor and of the DMC ignition delay times under low and high pressures. In this sense, this work contributes to the knowledge of the combustion process of DMC, by providing new experimental data on the conversion of DMC at high pressures and using a kinetic model for the interpretation of the results.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An experimental and modeling study of the oxidation at high pressure of dimethyl carbonate (DMC) has been performed in a quartz tubular flow reactor. Experimental and simulated concentrations of DMC, CO, CO2 and H2 have been obtained for different temperatures (500–1073 K), pressures (20, 40, and 60 atm) and stoichiometries ($łambda$ = 0.7, 1, and 35). Both pressure and concentration of oxygen are important parameters for conversion of DMC. The simulations have been carried out using a detailed kinetic mechanism previously developed by the research group. In general, the model is able to reproduce the experimental trends of the different concentration profiles, although some discrepancies are observed between experimental and simulation results. The performance of the model was also evaluated through the simulation of literature data of the oxidation of DMC at atmospheric pressure in a flow reactor and of the DMC ignition delay times under low and high pressures. In this sense, this work contributes to the knowledge of the combustion process of DMC, by providing new experimental data on the conversion of DMC at high pressures and using a kinetic model for the interpretation of the results.
2019
Alexandrino, Katiuska; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
Reactivity and Physicochemical Properties of the Soot Produced in the Pyrolysis of 2,5-Dimethylfuran and 2-Methylfuran Artículo de revista
En: Energy and Fuels, vol. 33, no 10, pp. 9851–9858, 2019, ISSN: 15205029.
@article{Alexandrino2019,
title = {Reactivity and Physicochemical Properties of the Soot Produced in the Pyrolysis of 2,5-Dimethylfuran and 2-Methylfuran},
author = {Katiuska Alexandrino and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1021/acs.energyfuels.9b01760},
issn = {15205029},
year = {2019},
date = {2019-10-01},
journal = {Energy and Fuels},
volume = {33},
number = {10},
pages = {9851--9858},
publisher = {American Chemical Society},
abstract = {Alkylated furan derivatives, such as 2,5-dimethylfuran (2,5-DMF) and 2-methylfuran (2-MF), have shown, at laboratory scale, a relatively high tendency to form soot. However, soot emissions from diesel engines are lower when diesel/2,5-DMF and diesel/2-MF blends are used. This could indicate that the soot produced in the conversion of these compounds has high reactivity toward some gases present within the combustion chamber, reducing soot emissions in the exhaust gas. In this context, a study on the reactivity and the characterization of the soot generated in the pyrolysis of 2,5-DMF and 2-MF, under different experimental conditions, was performed in an effort to increase the understanding of the reactivity and physicochemical properties of the soot originating in the conversion of these furan derivatives. The soot samples analyzed were obtained in previous works using different concentrations of the alkylated furan derivatives (5000, 7500, and 15â»000 ppm of 2,5-DMF, and 9000 and 18â»000 ppm of 2-MF) and at different temperatures (1275, 1375, and 1475 K). The reactivity experiments were performed at 1275 K with 500 ppm of O2 and 2000 ppm of NO in a tubular quartz flow reactor. Different instrumental analysis techniques were employed to characterize the soot samples and to try to link the soot reactivity with its physicochemical properties. The dependence of soot reactivity and properties with soot formation conditions, namely, temperature and inlet fuel concentration, is studied.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Alkylated furan derivatives, such as 2,5-dimethylfuran (2,5-DMF) and 2-methylfuran (2-MF), have shown, at laboratory scale, a relatively high tendency to form soot. However, soot emissions from diesel engines are lower when diesel/2,5-DMF and diesel/2-MF blends are used. This could indicate that the soot produced in the conversion of these compounds has high reactivity toward some gases present within the combustion chamber, reducing soot emissions in the exhaust gas. In this context, a study on the reactivity and the characterization of the soot generated in the pyrolysis of 2,5-DMF and 2-MF, under different experimental conditions, was performed in an effort to increase the understanding of the reactivity and physicochemical properties of the soot originating in the conversion of these furan derivatives. The soot samples analyzed were obtained in previous works using different concentrations of the alkylated furan derivatives (5000, 7500, and 15â»000 ppm of 2,5-DMF, and 9000 and 18â»000 ppm of 2-MF) and at different temperatures (1275, 1375, and 1475 K). The reactivity experiments were performed at 1275 K with 500 ppm of O2 and 2000 ppm of NO in a tubular quartz flow reactor. Different instrumental analysis techniques were employed to characterize the soot samples and to try to link the soot reactivity with its physicochemical properties. The dependence of soot reactivity and properties with soot formation conditions, namely, temperature and inlet fuel concentration, is studied.
Alexandrino, Katiuska; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
Reactivity and Physicochemical Properties of the Soot Produced in the Pyrolysis of 2,5-Dimethylfuran and 2-Methylfuran Artículo de revista
En: Energy and Fuels, vol. 33, no 10, pp. 9851–9858, 2019, ISSN: 15205029.
@article{Alexandrino2019a,
title = {Reactivity and Physicochemical Properties of the Soot Produced in the Pyrolysis of 2,5-Dimethylfuran and 2-Methylfuran},
author = {Katiuska Alexandrino and Ángela Millera and Rafael Bilbao and María U Alzueta},
url = {https://pubs.acs.org/sharingguidelines},
doi = {10.1021/acs.energyfuels.9b01760},
issn = {15205029},
year = {2019},
date = {2019-10-01},
journal = {Energy and Fuels},
volume = {33},
number = {10},
pages = {9851--9858},
publisher = {American Chemical Society},
abstract = {Alkylated furan derivatives, such as 2,5-dimethylfuran (2,5-DMF) and 2-methylfuran (2-MF), have shown, at laboratory scale, a relatively high tendency to form soot. However, soot emissions from diesel engines are lower when diesel/2,5-DMF and diesel/2-MF blends are used. This could indicate that the soot produced in the conversion of these compounds has high reactivity toward some gases present within the combustion chamber, reducing soot emissions in the exhaust gas. In this context, a study on the reactivity and the characterization of the soot generated in the pyrolysis of 2,5-DMF and 2-MF, under different experimental conditions, was performed in an effort to increase the understanding of the reactivity and physicochemical properties of the soot originating in the conversion of these furan derivatives. The soot samples analyzed were obtained in previous works using different concentrations of the alkylated furan derivatives (5000, 7500, and 15â»000 ppm of 2,5-DMF, and 9000 and 18â»000 ppm of 2-MF) and at different temperatures (1275, 1375, and 1475 K). The reactivity experiments were performed at 1275 K with 500 ppm of O2 and 2000 ppm of NO in a tubular quartz flow reactor. Different instrumental analysis techniques were employed to characterize the soot samples and to try to link the soot reactivity with its physicochemical properties. The dependence of soot reactivity and properties with soot formation conditions, namely, temperature and inlet fuel concentration, is studied.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Alkylated furan derivatives, such as 2,5-dimethylfuran (2,5-DMF) and 2-methylfuran (2-MF), have shown, at laboratory scale, a relatively high tendency to form soot. However, soot emissions from diesel engines are lower when diesel/2,5-DMF and diesel/2-MF blends are used. This could indicate that the soot produced in the conversion of these compounds has high reactivity toward some gases present within the combustion chamber, reducing soot emissions in the exhaust gas. In this context, a study on the reactivity and the characterization of the soot generated in the pyrolysis of 2,5-DMF and 2-MF, under different experimental conditions, was performed in an effort to increase the understanding of the reactivity and physicochemical properties of the soot originating in the conversion of these furan derivatives. The soot samples analyzed were obtained in previous works using different concentrations of the alkylated furan derivatives (5000, 7500, and 15â»000 ppm of 2,5-DMF, and 9000 and 18â»000 ppm of 2-MF) and at different temperatures (1275, 1375, and 1475 K). The reactivity experiments were performed at 1275 K with 500 ppm of O2 and 2000 ppm of NO in a tubular quartz flow reactor. Different instrumental analysis techniques were employed to characterize the soot samples and to try to link the soot reactivity with its physicochemical properties. The dependence of soot reactivity and properties with soot formation conditions, namely, temperature and inlet fuel concentration, is studied.
2018
Alexandrino, Katiuska; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
Gas and soot formed in the dimethoxymethane pyrolysis. Soot characterization Artículo de revista
En: Fuel Processing Technology, vol. 179, pp. 369–377, 2018, ISSN: 03783820.
@article{Alexandrino2018a,
title = {Gas and soot formed in the dimethoxymethane pyrolysis. Soot characterization},
author = {Katiuska Alexandrino and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1016/j.fuproc.2018.07.021},
issn = {03783820},
year = {2018},
date = {2018-10-01},
journal = {Fuel Processing Technology},
volume = {179},
pages = {369--377},
publisher = {Elsevier B.V.},
abstract = {The many simultaneous processes occurring within in a diesel engine make difficult a thorough understanding of the mechanisms responsible for reduction of soot and/or NOX when an oxygenated compound is added to diesel fuel. Thus, in order to explore the use of oxygenated compounds as biofuels/additives, it is interesting to study their conversion under well-controlled laboratory conditions, together with kinetic studies that help to interpret and understand the reaction schemes that occur during such processes. The aim of this work has been to contribute to the knowledge of the dimethoxymethane (DMM) pyrolysis, one of the oxygenated compounds proposed in literature as alternative fuel. In this way, the influence of pyrolysis temperature (1075–1475 K) and inlet fuel concentration (33,333 and 50,000 ppm DMM) on the sooting propensity of DMM, soot reactivity and its properties is analyzed. Therefore, this work includes pyrolysis experiments under different experimental conditions, focusing on the gas-phase analysis and the soot formation, together with a gas-phase model. Additionally, the interaction of soot with O2 and with NO has been studied, and since soot properties are important on the oxidation rate, selected soot samples have been characterized by different instrumental techniques (elemental analysis, physical adsorption with N2, Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), and Raman spectroscopy).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The many simultaneous processes occurring within in a diesel engine make difficult a thorough understanding of the mechanisms responsible for reduction of soot and/or NOX when an oxygenated compound is added to diesel fuel. Thus, in order to explore the use of oxygenated compounds as biofuels/additives, it is interesting to study their conversion under well-controlled laboratory conditions, together with kinetic studies that help to interpret and understand the reaction schemes that occur during such processes. The aim of this work has been to contribute to the knowledge of the dimethoxymethane (DMM) pyrolysis, one of the oxygenated compounds proposed in literature as alternative fuel. In this way, the influence of pyrolysis temperature (1075–1475 K) and inlet fuel concentration (33,333 and 50,000 ppm DMM) on the sooting propensity of DMM, soot reactivity and its properties is analyzed. Therefore, this work includes pyrolysis experiments under different experimental conditions, focusing on the gas-phase analysis and the soot formation, together with a gas-phase model. Additionally, the interaction of soot with O2 and with NO has been studied, and since soot properties are important on the oxidation rate, selected soot samples have been characterized by different instrumental techniques (elemental analysis, physical adsorption with N2, Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), and Raman spectroscopy).