The Experts below are selected from a list of 204417 Experts worldwide ranked by ideXlab platform

Celine Babe - One of the best experts on this subject based on the ideXlab platform.

  • crystallite size effect in the sulfidation of zno by h2s geometric and kinetic modelling of the transformation
    Chemical Engineering Science, 2012
    Co-Authors: Celine Babe, Melaz Tayakoutfayolle, Christophe Geantet, M Vrinat, Gerard Bergeret, Thierry Huard, Delphine Bazerbachi
    Abstract:

    Hydrogen sulfide capture is an important technological challenge in energy and fuel industries, and reactive adsorption over zinc oxide is considered as a highly efficient one. This type of desulfurizing process is often proposed in the literature for the treatment of gas such as coal derived fuel gas, biogas or syngas. We investigated the capture of H2S by ZnO, in a continuous flow unit, using several powders having different crystallite sizes and obtained by sintering of a commercial product. From the breakthrough curves obtained by means of sulfidation experiments performed on a fixed bed reactor of sorbent Crystallites and crystallographic considerations, a layer by layer representation of the Crystallites sulfidation was established and demonstrated that the sulfidation was limited for large Crystallites, despite there was no thermodynamic limitation. A modelling of the breakthrough curves was performed using a geometrical model of the ZnO sulfidation layer per layer of the crystallite, including a variable diffusion coefficient, providing a good correlation between experimental and calculated data.

  • Crystallite size effect in the sulfidation of ZnO by H2S: Geometric and kinetic modelling of the transformation
    Chemical Engineering Science, 2012
    Co-Authors: Celine Babe, Christophe Geantet, M Vrinat, Gerard Bergeret, Thierry Huard, M. Tayakout-fayolle, Delphine Bazer-bachi
    Abstract:

    Hydrogen sulfide capture is an important technological challenge in energy and fuel industries, and reactive adsorption over zinc oxide is considered as a highly efficient one. This type of desulfurizing process is often proposed in the literature for the treatment of gas such as coal derived fuel gas, biogas or syngas. We investigated the capture of H2S by ZnO, in a continuous flow unit, using several powders having different crystallite sizes and obtained by sintering of a commercial product. From the breakthrough curves obtained by means of sulfidation experiments performed on a fixed bed reactor of sorbent Crystallites and crystallographic considerations, a layer by layer representation of the Crystallites sulfidation was established and demonstrated that the sulfidation was limited for large Crystallites, despite there was no thermodynamic limitation. A modelling of the breakthrough curves was performed using a geometrical model of the ZnO sulfidation layer per layer of the crystallite, including a variable diffusion coefficient, providing a good correlation between experimental and calculated data. (C) 2012 Elsevier Ltd. All rights reserved.

E. Munch - One of the best experts on this subject based on the ideXlab platform.

  • Temperature dependence of strain-induced crystallization in natural rubber: On the presence of different crystallite populations
    Polymer, 2015
    Co-Authors: N. Candau, R. Laghmach, Laurent Chazeau, J.-m. Chenal, C. Gauthier, Thierry Biben, E. Munch
    Abstract:

    The effect of the temperature on strain induced crystallization (SIC) of natural rubber (NR) is studied by in situ wide angle X-rays scattering (WAXS) experiments performed along different thermo-mechanical paths (cyclic deformation at different temperatures or crystallization and melting in the deformed state). The crystallinity index (CI), the average crystallite size (L200) and the average volume of the Crystallites (V) increase (decrease) similarly if the sample is cooled (heated) in the deformed state or stretched (unstretched) at fixed temperature. These experiments are analyzed through a thermodynamic description assuming that SIC is controlled by successive nucleation of crystallite populations. Such description predicts that for a stretching ratio λ above (below) 4 and a temperature above (below) room temperature, crystallization first occurs in chains with the highest (lowest) network chain density, leading to the smallest (largest) Crystallites. ©2015 Elsevier Ltd. All rights reserved.

  • Strain-induced crystallization of natural rubber and cross-link densities heterogeneities
    Macromolecules, 2014
    Co-Authors: N. Candau, R. Laghmach, Laurent Chazeau, J.-m. Chenal, C. Gauthier, Thierry Biben, E. Munch
    Abstract:

    Strain-induced crystallization (SIC) of natural rubber (NR) is characterized during a cyclic deformation at room temperature and low strain rate (∼10-3 s-1) using in situ wide angle X-rays scattering (WAXS) measurements. The crystallinity index (CI) and average size of the Crystallites in the three main directions are measured during loading and unloading. A scenario describing SIC is then proposed, assuming that SIC corresponds to the successive appearance of crystallite populations whose nucleation and growth depend on the local network density. From this scenario, a methodology, coupling experimental observations and thermodynamic description is developed to determine the distribution of the network chain density associated with the size of a corresponding crystallite population. Finally, complex cyclic tests are performed. They suggest the existence of a memory effect in the chains involved in crystallization, which eases the nucleation process of the Crystallites. © 2014 American Chemical Society.

Delphine Bazerbachi - One of the best experts on this subject based on the ideXlab platform.

  • crystallite size effect in the sulfidation of zno by h2s geometric and kinetic modelling of the transformation
    Chemical Engineering Science, 2012
    Co-Authors: Celine Babe, Melaz Tayakoutfayolle, Christophe Geantet, M Vrinat, Gerard Bergeret, Thierry Huard, Delphine Bazerbachi
    Abstract:

    Hydrogen sulfide capture is an important technological challenge in energy and fuel industries, and reactive adsorption over zinc oxide is considered as a highly efficient one. This type of desulfurizing process is often proposed in the literature for the treatment of gas such as coal derived fuel gas, biogas or syngas. We investigated the capture of H2S by ZnO, in a continuous flow unit, using several powders having different crystallite sizes and obtained by sintering of a commercial product. From the breakthrough curves obtained by means of sulfidation experiments performed on a fixed bed reactor of sorbent Crystallites and crystallographic considerations, a layer by layer representation of the Crystallites sulfidation was established and demonstrated that the sulfidation was limited for large Crystallites, despite there was no thermodynamic limitation. A modelling of the breakthrough curves was performed using a geometrical model of the ZnO sulfidation layer per layer of the crystallite, including a variable diffusion coefficient, providing a good correlation between experimental and calculated data.

Delphine Bazer-bachi - One of the best experts on this subject based on the ideXlab platform.

  • Crystallite size effect in the sulfidation of ZnO by H2S: Geometric and kinetic modelling of the transformation
    Chemical Engineering Science, 2012
    Co-Authors: Celine Babe, Christophe Geantet, M Vrinat, Gerard Bergeret, Thierry Huard, M. Tayakout-fayolle, Delphine Bazer-bachi
    Abstract:

    Hydrogen sulfide capture is an important technological challenge in energy and fuel industries, and reactive adsorption over zinc oxide is considered as a highly efficient one. This type of desulfurizing process is often proposed in the literature for the treatment of gas such as coal derived fuel gas, biogas or syngas. We investigated the capture of H2S by ZnO, in a continuous flow unit, using several powders having different crystallite sizes and obtained by sintering of a commercial product. From the breakthrough curves obtained by means of sulfidation experiments performed on a fixed bed reactor of sorbent Crystallites and crystallographic considerations, a layer by layer representation of the Crystallites sulfidation was established and demonstrated that the sulfidation was limited for large Crystallites, despite there was no thermodynamic limitation. A modelling of the breakthrough curves was performed using a geometrical model of the ZnO sulfidation layer per layer of the crystallite, including a variable diffusion coefficient, providing a good correlation between experimental and calculated data. (C) 2012 Elsevier Ltd. All rights reserved.

Thierry Huard - One of the best experts on this subject based on the ideXlab platform.

  • crystallite size effect in the sulfidation of zno by h2s geometric and kinetic modelling of the transformation
    Chemical Engineering Science, 2012
    Co-Authors: Celine Babe, Melaz Tayakoutfayolle, Christophe Geantet, M Vrinat, Gerard Bergeret, Thierry Huard, Delphine Bazerbachi
    Abstract:

    Hydrogen sulfide capture is an important technological challenge in energy and fuel industries, and reactive adsorption over zinc oxide is considered as a highly efficient one. This type of desulfurizing process is often proposed in the literature for the treatment of gas such as coal derived fuel gas, biogas or syngas. We investigated the capture of H2S by ZnO, in a continuous flow unit, using several powders having different crystallite sizes and obtained by sintering of a commercial product. From the breakthrough curves obtained by means of sulfidation experiments performed on a fixed bed reactor of sorbent Crystallites and crystallographic considerations, a layer by layer representation of the Crystallites sulfidation was established and demonstrated that the sulfidation was limited for large Crystallites, despite there was no thermodynamic limitation. A modelling of the breakthrough curves was performed using a geometrical model of the ZnO sulfidation layer per layer of the crystallite, including a variable diffusion coefficient, providing a good correlation between experimental and calculated data.

  • Crystallite size effect in the sulfidation of ZnO by H2S: Geometric and kinetic modelling of the transformation
    Chemical Engineering Science, 2012
    Co-Authors: Celine Babe, Christophe Geantet, M Vrinat, Gerard Bergeret, Thierry Huard, M. Tayakout-fayolle, Delphine Bazer-bachi
    Abstract:

    Hydrogen sulfide capture is an important technological challenge in energy and fuel industries, and reactive adsorption over zinc oxide is considered as a highly efficient one. This type of desulfurizing process is often proposed in the literature for the treatment of gas such as coal derived fuel gas, biogas or syngas. We investigated the capture of H2S by ZnO, in a continuous flow unit, using several powders having different crystallite sizes and obtained by sintering of a commercial product. From the breakthrough curves obtained by means of sulfidation experiments performed on a fixed bed reactor of sorbent Crystallites and crystallographic considerations, a layer by layer representation of the Crystallites sulfidation was established and demonstrated that the sulfidation was limited for large Crystallites, despite there was no thermodynamic limitation. A modelling of the breakthrough curves was performed using a geometrical model of the ZnO sulfidation layer per layer of the crystallite, including a variable diffusion coefficient, providing a good correlation between experimental and calculated data. (C) 2012 Elsevier Ltd. All rights reserved.