The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform
V Collinsmartinez - One of the best experts on this subject based on the ideXlab platform.
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kinetic study of the co2 desorption process by carbonated na2zro3 Solid Absorbent
International Journal of Hydrogen Energy, 2015Co-Authors: Castillo A Villa, Salinas J Gutierrez, C Navarro J Gomez, G Aquino S De Los Rios, Renteria M Villalobos, Cortes L Palacios, Lopez A Ortiz, V CollinsmartinezAbstract:Abstract A kinetic study of the CO2 desorption process by carbonated sodium zirconate (Na2ZrO3) synthesized by a liquid suspension route is presented using zirconium acetylacetonate and sodium acetate as precursors. Na2ZrO3 was characterized by XRD, SEM and TGA. Na2ZrO3 exhibited a 90% conversion during absorption with respect to the theoretical value. CO2 desorption kinetic study used three temperatures; 850, 900 °C and 950 °C and three concentrations: 5, 3 and 1% of CO2 in Ar at 200 ml/min. XRD data shown only slight segregation of the precursors, which led to a small amount of ZrO2 formation in the Solid product. The global rate of the decarbonation reaction of Na2ZrO3 was of first order in CO2 concentration and strongly dependent on temperature. The calculated apparent activation energy was EA = 23.35 kcal/mol. Na2ZrO3 performance during four continuous cycles, shown an excellent thermal and chemical stability, with the material conversion remaining practically unchanged.
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kinetic study and modeling of the high temperature co2 capture by na2zro3 Solid Absorbent
International Journal of Hydrogen Energy, 2013Co-Authors: Diana Barraza Jimenez, Miguel Escobedo A Bretado, Daniel Lardizabal Gutierrez, Jesus Salinas Gutierrez, Alejandro Lopez Ortiz, V CollinsmartinezAbstract:Abstract Hydrogen production through sorption enhanced reforming (SER) use a Solid CO2 Absorbent to increase hydrogen purity (98%) and to perform reforming and WGS reactions in one single step, thus producing high methane conversions and important energy savings. Na2ZrO3 is as an alternate synthetic CO2 Solid Absorbent for SER applications. The present research is aimed to establish CO2 sorption kinetics parameters; reaction order, rate constant, apparent, intrinsic and diffusional activation energies. Na2ZrO3 sorption kinetics was studied through TGA as a function of CO2 concentration and temperature. A global reaction rate of first order in CO2 and a strong dependence in temperature was found. The approximate solution to the shrinking core model was used to fit the data. Modeling results indicated the surface reaction as the main resistance to the reaction rate, controlling reaction kinetics with only a minor contribution of the product layer diffusion resistance toward the end of the reaction.
Somayeh Farzad - One of the best experts on this subject based on the ideXlab platform.
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kinetic modeling of the fischer tropsch synthesis in a slurry phase bubble column reactor using langmuir freundlich isotherm
Fuel Processing Technology, 2012Co-Authors: Ali Haghtalab, M. Nabipoor, Somayeh FarzadAbstract:Abstract We employed the Langmuir–Freundlich isotherm for Fischer–Tropsch synthesis as a modification of the commonly used Langmuir isotherm, because the Langmuir–Freundlich isotherm can predict the adsorption of gases at Solid Absorbent more accurately than Langmuir isotherm. Several mechanisms for kinetic modeling of the Fischer–Tropsch synthesis have been developed in which the Langmuir isotherm is the basis of kinetic modeling of the catalytic reactions. Using Langmuir–Freundlich–Hinshelwood (LFH) model, the results of CO conversion in a slurry bubble column reactor show a very good agreement with the experiment. Moreover, we used fugacity instead of the pressure that leads to improve the accuracy of the new kinetic model. The fugacity term has been considered here by using Peng–Robinson Equation of State, modified by Gasem et al. The new kinetic model with fugacity is applied for modeling of a slurry bubble column reactor over the wide range of the reactor conditions of 523–563 K, 0.95–2.55 MPa and H 2 /CO ratio: 0.65–1.51. The results of the new kinetic LFH‐fugacity model shows the Average Absolute Deviation percentage (AAD%) of 4.25% for the CO conversion while this value is about 10.89% using the original equation based on Langmuir isotherm.
Ali Haghtalab - One of the best experts on this subject based on the ideXlab platform.
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product distribution of fischer tropsch synthesis in a slurry bubble column reactor based on langmuir freundlich isotherm
Chemical Engineering Communications, 2013Co-Authors: Mojtaba Nabipoor Hassankiadeh, Ali HaghtalabAbstract:A comprehensive kinetic model for Fischer-Tropsch synthesis was developed. The dual mechanism theory for product distribution in Fischer-Tropsch synthesis developed by Fernandes was used in this study with a newly developed reaction rate equation. That is, the Langmuir-Freundlich isotherm for Fischer-Tropsch (FT) synthesis was employed, a modification of the commonly used Langmuir isotherm. Since the Langmuir-Freundlich isotherm can predict the adsorption of gases at a Solid Absorbent more accurately than the Langmuir isotherm, the new Langmuir-Freundlich kinetic model was developed for FT synthesis. The new kinetic model was used for product distribution, and the parameters of the equations were obtained from optimization. A product distribution prediction resulted from the dual mechanism theory and the newly developed kinetic model shows very good agreement with the experimental data. The average absolute deviation (AAD%) in paraffin and olefin prediction is about 13.96% and 11.41% respectively, for the...
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kinetic modeling of the fischer tropsch synthesis in a slurry phase bubble column reactor using langmuir freundlich isotherm
Fuel Processing Technology, 2012Co-Authors: Ali Haghtalab, M. Nabipoor, Somayeh FarzadAbstract:Abstract We employed the Langmuir–Freundlich isotherm for Fischer–Tropsch synthesis as a modification of the commonly used Langmuir isotherm, because the Langmuir–Freundlich isotherm can predict the adsorption of gases at Solid Absorbent more accurately than Langmuir isotherm. Several mechanisms for kinetic modeling of the Fischer–Tropsch synthesis have been developed in which the Langmuir isotherm is the basis of kinetic modeling of the catalytic reactions. Using Langmuir–Freundlich–Hinshelwood (LFH) model, the results of CO conversion in a slurry bubble column reactor show a very good agreement with the experiment. Moreover, we used fugacity instead of the pressure that leads to improve the accuracy of the new kinetic model. The fugacity term has been considered here by using Peng–Robinson Equation of State, modified by Gasem et al. The new kinetic model with fugacity is applied for modeling of a slurry bubble column reactor over the wide range of the reactor conditions of 523–563 K, 0.95–2.55 MPa and H 2 /CO ratio: 0.65–1.51. The results of the new kinetic LFH‐fugacity model shows the Average Absolute Deviation percentage (AAD%) of 4.25% for the CO conversion while this value is about 10.89% using the original equation based on Langmuir isotherm.
M. Nabipoor - One of the best experts on this subject based on the ideXlab platform.
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kinetic modeling of the fischer tropsch synthesis in a slurry phase bubble column reactor using langmuir freundlich isotherm
Fuel Processing Technology, 2012Co-Authors: Ali Haghtalab, M. Nabipoor, Somayeh FarzadAbstract:Abstract We employed the Langmuir–Freundlich isotherm for Fischer–Tropsch synthesis as a modification of the commonly used Langmuir isotherm, because the Langmuir–Freundlich isotherm can predict the adsorption of gases at Solid Absorbent more accurately than Langmuir isotherm. Several mechanisms for kinetic modeling of the Fischer–Tropsch synthesis have been developed in which the Langmuir isotherm is the basis of kinetic modeling of the catalytic reactions. Using Langmuir–Freundlich–Hinshelwood (LFH) model, the results of CO conversion in a slurry bubble column reactor show a very good agreement with the experiment. Moreover, we used fugacity instead of the pressure that leads to improve the accuracy of the new kinetic model. The fugacity term has been considered here by using Peng–Robinson Equation of State, modified by Gasem et al. The new kinetic model with fugacity is applied for modeling of a slurry bubble column reactor over the wide range of the reactor conditions of 523–563 K, 0.95–2.55 MPa and H 2 /CO ratio: 0.65–1.51. The results of the new kinetic LFH‐fugacity model shows the Average Absolute Deviation percentage (AAD%) of 4.25% for the CO conversion while this value is about 10.89% using the original equation based on Langmuir isotherm.
Diana Barraza Jimenez - One of the best experts on this subject based on the ideXlab platform.
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kinetic study and modeling of the high temperature co2 capture by na2zro3 Solid Absorbent
International Journal of Hydrogen Energy, 2013Co-Authors: Diana Barraza Jimenez, Miguel Escobedo A Bretado, Daniel Lardizabal Gutierrez, Jesus Salinas Gutierrez, Alejandro Lopez Ortiz, V CollinsmartinezAbstract:Abstract Hydrogen production through sorption enhanced reforming (SER) use a Solid CO2 Absorbent to increase hydrogen purity (98%) and to perform reforming and WGS reactions in one single step, thus producing high methane conversions and important energy savings. Na2ZrO3 is as an alternate synthetic CO2 Solid Absorbent for SER applications. The present research is aimed to establish CO2 sorption kinetics parameters; reaction order, rate constant, apparent, intrinsic and diffusional activation energies. Na2ZrO3 sorption kinetics was studied through TGA as a function of CO2 concentration and temperature. A global reaction rate of first order in CO2 and a strong dependence in temperature was found. The approximate solution to the shrinking core model was used to fit the data. Modeling results indicated the surface reaction as the main resistance to the reaction rate, controlling reaction kinetics with only a minor contribution of the product layer diffusion resistance toward the end of the reaction.
