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۱An Experimental Design Study on CO2 and CH4 Adsorption Equilibria in MWCNT–OH and Optimal Conditions for Maximum CO2 Adsorption against CH4
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
Equilibrium adsorption property of multi–walled carbon nanotubes functionalized by hydroxyl group (MWCNTOH) was studied using experimental design for adsorption of CH4 and CO2. The effect of temperature, pressure and their interaction on the adsorption capacity was examined by the central composite orthogonal design (CCOD) and the significant effects were determined by analysis of variance. The experiments were carried out at various temperatures (from 288.15 to 308.15 K) and pressures (4.5 to 39.8 bars) to find out the optimal conditions for the maximum adsorption of CO2 versus CH4 on the MWCNT–OH. The statistical analysis of the results showed the significance of linear, interaction and quadratic relation of temperature and pressure to CO2 and CH4 adsorbed capacity. After optimization, the maximum CO2\CH4 selectivity was determined at temperature of 288.15 K and pressure of 21.32 bar which was predicted as 6.35.<\div>

۲Study of CH4– CO2 Binary Adsorption Equilibria in MWCNT–OH by Excess Gibbs Energy Models
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
The binary–gas adsorption equilibrium of CH4 and CO2, is predicted using single–component adsorption experimental data by excess Gibbs energy model, based on vacancy solution theory ,in multi–walled carbon nanotubes functioned by OH group (MWCNT–OH), as a new adsorbent for methane and carbon dioxide .The experimental data of adsorption isotherm of each component were measured at various temperatures and pressures and they were correlated by vacancy solution models based on Wilson and NRTL equations. The model parameters were determined by fitting on the experimental data for pure components .Finally , the pure component parameters were employed in extended Wilson and NRTL equations for the gaseous mixtures to predict CH4– CO2 adsorption equilibrium conditions as the equilibrium mole fractions in gas and adsorbed phase.<\div>
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