Breakthrough analysis for CO2 removal by activated hydrotalcite and soda ash

Date

2006-06-30

Author

Ficicilar, Berker
Doğu, Timur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

154
views

0
downloads

Carbon dioxide sorption rate parameters and sorption capacities on two different regenerable sorbents, namely hydrotalcite and activated trona, were investigated in a fixed bed flow adsorber, in the temperature range of 400-527 degrees C and 80-152 degrees C, respectively. Hydrotalcite, which was activated at 550 degrees C, was shown to give total and breakthrough CO2 sorption capacities as high as 1.16 and 0.70 mmol/g, respectively, at 452 degrees C, in the absence of water vapor. In the presence of excess water vapor, the total CO2 Sorption capacity was not affected much, however a decrease in the breakthrough capacity and on the sorption rate constant was observed, especially at lower temperatures. In the presence of water vapor, activated trona was shown to give comparable total and breakthrough CO2 sorption capacities, at much lower temperatures (T < 100 degrees C). The deactivation model gave good predictions of the CO2 breakthrough curves and it was successfully used for the evaluation of the adsorption and the deactivation rate constants.

Subject Keywords

CO2 removal, Hydrotalcite, Trona, Soda ash, Deactivation model

URI

https://hdl.handle.net/11511/31843

Journal

CATALYSIS TODAY

DOI

https://doi.org/10.1016/j.cattod.2006.02.058

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Critical behaviour of ammonia near the melting point Yurtseven, Hasan Hamit (2002-08-01) This study gives our calculations for thermodynamic quantities, such as the isothermal cornpressibility k(T), thermal expansivity alphap and the specific heat C-P, as a function of temperature for solid ammonia near the melting point. Our calculations, which have been performed on the basis of an experimental study given in the literature, show that those thermodynamic quantities diver e near the melting point in ammonia. This is an indication that ammonia exhibits a critical transition as one approaches th...
Evaluation of nusselt number for a flow in a microtube with constant heat flux including axial conduction, viscous dissipation and second-order slip model Çetin, Barbaros; Bayer, Özgür (2010-09-28) In this paper, the fully-developed temperature profile and corresponding Nusselt value is determined analytically for a gaseous flow in a microtube with a thermal boundary condition of constant wall heat flux. The flow assumed to be laminar, and hydrodynamically and thermally fully developed. The fluid is assumed to be constant property and incompressible. The effect of rarefaction, viscous dissipation and axial conduction, which are important at the microscale, are i...
Critical behaviour of the dielectric constant for the smectic AC* transition under the electric field in ferroelectric liquid crystals Yurtseven, Hasan Hamit (2012-01-01) The temperature dependencies of the dielectric constant and the tilt angle (order parameter) are calculated under the electric field for the smectic A-smectic C* (AC*) transition in 4-(3-methyl-2-chlorobutanoyloxy)-4'-heptyloxybiphenyl (A7). The dielectric constant is fitted to the experimental data by using our mean field model with the biquadratic coupling between the spontaneous polarisation P and the tilt angle theta. Our results show that the mean field model with the P-2 theta(2) coupling describes sa...
Electrical current generation in microbial electrolysis cells by hyperthermophilic archaea Ferroglobus placidus and Geoglobus ahangari Yılmazel Tokel, Yasemin Dilşad; Kim, Kyoung-Yeol; Holmes, Dawn E.; Logan, Bruce E. (2018-02-01) Few microorganisms have been examined for current generation under thermophilic (40-65 degrees C) or hyperthermophilic temperatures (>= 80 degrees C) in microbial electrochemical systems. Two iron-reducing archaea from the family Archadoglobaceae, Ferroglobus placidus and Geoglobus ahangari, showed electro-active behavior leading to current generation at hyperthermophilic temperatures in single-chamber microbial electrolysis cells (MECs). A current density (j) of 0.68 +/- 0.11 A/m(2) was attained in F. plac...
Experimental research on in-tube condensation under steady-state and transient conditions Tanrikut, A; Yesin, O (2005-01-01) In this research study, in-tube condensation in the presence of air was investigated experimentally at a heat exchanger of countercurrent type for different operating conditions. The test matrix for the steady-state condition covers the range of pressures P = 1.8 to 5.5 bars, vapor Reynolds numbers Re, = 45 000 to 94 000, and inlet air mass fraction values Xi = 0 to 52%. The effect of air manifests itself by a reduction in the local heat flux and the local heat transfer coefficient. The local heat transfer ...

Citation Formats

B. Ficicilar and T. Doğu, “Breakthrough analysis for CO2 removal by activated hydrotalcite and soda ash,” CATALYSIS TODAY, pp. 274–278, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31843.