The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
Saeid Azizian - One of the best experts on this subject based on the ideXlab platform.
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mixed Surface Reaction and diffusion controlled kinetic model for adsorption at the solid solution interface
Journal of Physical Chemistry C, 2013Co-Authors: Monireh Haerifar, Saeid AzizianAbstract:The effects of diffusion and Surface Reaction mechanisms have been considered conjointly to investigate the kinetics of adsorption. A new model has been proposed for the modeling of adsorption kinetics at the solid/solution interface in batch systems. Based on generated data points (t, q) by using of the new model, it was found that there is a deviation from linearity as a downward curvature at initial times of adsorption in usual t/q vs time plot, when diffusion contributes to the rate-controlling step of adsorption. Moreover, results of nonlinear fitting to the different experimental data show that the mixed Surface Reaction and diffusion-controlled model can be useful for kinetics modeling of adsorption in which pure Surface Reaction or mixed Surface Reaction and diffusion contribute to the rate-controlling step of adsorption.
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Mixed Surface Reaction and Diffusion-Controlled Kinetic Model for Adsorption at the Solid/Solution Interface
Journal of Physical Chemistry C, 2013Co-Authors: Monireh Haerifar, Saeid AzizianAbstract:The effects of diffusion and Surface Reaction mechanisms have been considered conjointly to investigate the kinetics of adsorption. A new model has been proposed for the modeling of adsorption kinetics at the solid/solution interface in batch systems. Based on generated data points (t, q) by using of the new model, it was found that there is a deviation from linearity as a downward curvature at initial times of adsorption in usual t/q vs time plot, when diffusion contributes to the rate-controlling step of adsorption. Moreover, results of nonlinear fitting to the different experimental data show that the mixed Surface Reaction and diffusion-controlled model can be useful for kinetics modeling of adsorption in which pure Surface Reaction or mixed Surface Reaction and diffusion contribute to the rate-controlling step of adsorption.
Shuanbing Zhang - One of the best experts on this subject based on the ideXlab platform.
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a study on the apparent kinetics of h2s removal using a zno mno desulfurizer
Industrial & Engineering Chemistry Research, 1997Co-Authors: Yanxu Li, Chunhu Li, Shuanbing ZhangAbstract:The apparent kinetics of H2S removal by a ZnO−MnO desulfurizer were studied by thermogravimetric analysis. The experimental results show that the Reaction is first order with respect to H2S concentration. In the temperature range 200−400 °C, the rate was controlled, at lower temperatures, by the grain Surface Reaction rate and, at higher temperatures, by the rate of intrapellet diffusion, respectively. The apparent kinetic behavior could be modeled by the equivalent grain model. The activation energies of Surface Reaction and solid diffusion were determined to be 11.842 and 20.865 kJ/mol, respectively. An optimum Reaction temperature was observed. Reasons for this and why the solid diffusion activation energy exceeded that of the Surface Reaction are proposed.
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A Study on the Apparent Kinetics of H2S Removal Using a ZnO−MnO Desulfurizer
Industrial & Engineering Chemistry Research, 1997Co-Authors: Yanxu Li, Chunhu Li, Shuanbing ZhangAbstract:The apparent kinetics of H2S removal by a ZnO−MnO desulfurizer were studied by thermogravimetric analysis. The experimental results show that the Reaction is first order with respect to H2S concentration. In the temperature range 200−400 °C, the rate was controlled, at lower temperatures, by the grain Surface Reaction rate and, at higher temperatures, by the rate of intrapellet diffusion, respectively. The apparent kinetic behavior could be modeled by the equivalent grain model. The activation energies of Surface Reaction and solid diffusion were determined to be 11.842 and 20.865 kJ/mol, respectively. An optimum Reaction temperature was observed. Reasons for this and why the solid diffusion activation energy exceeded that of the Surface Reaction are proposed.
Monireh Haerifar - One of the best experts on this subject based on the ideXlab platform.
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mixed Surface Reaction and diffusion controlled kinetic model for adsorption at the solid solution interface
Journal of Physical Chemistry C, 2013Co-Authors: Monireh Haerifar, Saeid AzizianAbstract:The effects of diffusion and Surface Reaction mechanisms have been considered conjointly to investigate the kinetics of adsorption. A new model has been proposed for the modeling of adsorption kinetics at the solid/solution interface in batch systems. Based on generated data points (t, q) by using of the new model, it was found that there is a deviation from linearity as a downward curvature at initial times of adsorption in usual t/q vs time plot, when diffusion contributes to the rate-controlling step of adsorption. Moreover, results of nonlinear fitting to the different experimental data show that the mixed Surface Reaction and diffusion-controlled model can be useful for kinetics modeling of adsorption in which pure Surface Reaction or mixed Surface Reaction and diffusion contribute to the rate-controlling step of adsorption.
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Mixed Surface Reaction and Diffusion-Controlled Kinetic Model for Adsorption at the Solid/Solution Interface
Journal of Physical Chemistry C, 2013Co-Authors: Monireh Haerifar, Saeid AzizianAbstract:The effects of diffusion and Surface Reaction mechanisms have been considered conjointly to investigate the kinetics of adsorption. A new model has been proposed for the modeling of adsorption kinetics at the solid/solution interface in batch systems. Based on generated data points (t, q) by using of the new model, it was found that there is a deviation from linearity as a downward curvature at initial times of adsorption in usual t/q vs time plot, when diffusion contributes to the rate-controlling step of adsorption. Moreover, results of nonlinear fitting to the different experimental data show that the mixed Surface Reaction and diffusion-controlled model can be useful for kinetics modeling of adsorption in which pure Surface Reaction or mixed Surface Reaction and diffusion contribute to the rate-controlling step of adsorption.
Yanxu Li - One of the best experts on this subject based on the ideXlab platform.
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a study on the apparent kinetics of h2s removal using a zno mno desulfurizer
Industrial & Engineering Chemistry Research, 1997Co-Authors: Yanxu Li, Chunhu Li, Shuanbing ZhangAbstract:The apparent kinetics of H2S removal by a ZnO−MnO desulfurizer were studied by thermogravimetric analysis. The experimental results show that the Reaction is first order with respect to H2S concentration. In the temperature range 200−400 °C, the rate was controlled, at lower temperatures, by the grain Surface Reaction rate and, at higher temperatures, by the rate of intrapellet diffusion, respectively. The apparent kinetic behavior could be modeled by the equivalent grain model. The activation energies of Surface Reaction and solid diffusion were determined to be 11.842 and 20.865 kJ/mol, respectively. An optimum Reaction temperature was observed. Reasons for this and why the solid diffusion activation energy exceeded that of the Surface Reaction are proposed.
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A Study on the Apparent Kinetics of H2S Removal Using a ZnO−MnO Desulfurizer
Industrial & Engineering Chemistry Research, 1997Co-Authors: Yanxu Li, Chunhu Li, Shuanbing ZhangAbstract:The apparent kinetics of H2S removal by a ZnO−MnO desulfurizer were studied by thermogravimetric analysis. The experimental results show that the Reaction is first order with respect to H2S concentration. In the temperature range 200−400 °C, the rate was controlled, at lower temperatures, by the grain Surface Reaction rate and, at higher temperatures, by the rate of intrapellet diffusion, respectively. The apparent kinetic behavior could be modeled by the equivalent grain model. The activation energies of Surface Reaction and solid diffusion were determined to be 11.842 and 20.865 kJ/mol, respectively. An optimum Reaction temperature was observed. Reasons for this and why the solid diffusion activation energy exceeded that of the Surface Reaction are proposed.
Chandrasekhar Venkataraman - One of the best experts on this subject based on the ideXlab platform.
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Stability analysis and simulations of coupled bulk-Surface Reaction-diffusion systems
Proceedings. Mathematical physical and engineering sciences, 2015Co-Authors: Anotida Madzvamuse, Andy H. W. Chung, Chandrasekhar VenkataramanAbstract:In this article, we formulate new models for coupled systems of bulk-Surface Reaction–diffusion equations on stationary volumes. The bulk Reaction–diffusion equations are coupled to the Surface Reaction–diffusion equations through linear Robin-type boundary conditions. We then state and prove the necessary conditions for diffusion-driven instability for the coupled system. Owing to the nature of the coupling between bulk and Surface dynamics, we are able to decouple the stability analysis of the bulk and Surface dynamics. Under a suitable choice of model parameter values, the bulk Reaction–diffusion system can induce patterning on the Surface independent of whether the Surface Reaction–diffusion system produces or not, patterning. On the other hand, the Surface Reaction–diffusion system cannot generate patterns everywhere in the bulk in the absence of patterning from the bulk Reaction–diffusion system. For this case, patterns can be induced only in regions close to the Surface membrane. Various numerical experiments are presented to support our theoretical findings. Our most revealing numerical result is that, Robin-type boundary conditions seem to introduce a boundary layer coupling the bulk and Surface dynamics.
