Evaluation of moisture effect on low-level CO2 adsorption by ion-exchanged zeolite

To enhance the capture of low-level indoor CO2, a commercial zeolite (13X) was modified with alkali and alkaline earth metals using an ion-exchange method. Although the calcium-impregnated sorbent (zeo-Ca) showed the largest adsorption capacity, with a strong binding force for carbon dioxide, its regeneration by heat treatment was very difficult. Moisture in the gas flow caused significant decreases in CO2 adsorption capability as well as in the lifetime of the adsorbents. As for the regeneration gas, the test showed that nitrogen would hinder the CO2 adsorption more significantly than helium gas. Water vapour and nitrogen gas molecules are apt to competitively occupy the available sites of the adsorbent over the CO2 molecules.

[1]  Costas Tsouris,et al.  Separation of CO2 from Flue Gas: A Review , 2005 .

[2]  P. Llewellyn,et al.  Adsorption mechanism of carbon dioxide in faujasites: grand canonical monte carlo simulations and microcalorimetry measurements. , 2005, The journal of physical chemistry. B.

[3]  Kechang Xie,et al.  Adsorption of Carbon Dioxide on Activated Carbon , 2006 .

[4]  M. Douglas LeVan,et al.  CO2 adsorption in Y and X zeolites modified by alkali metal cation exchange , 2006 .

[5]  Sukumar Devotta,et al.  Monoethanol Amine Modified Zeolite 13X for CO2 Adsorption at Different Temperatures , 2007 .

[6]  B. McClaine,et al.  Adsorption of N2 and CO2 on Zeolite X Exchanged with Potassium, Barium, or Lanthanum , 2003 .

[7]  Douglas M. Ruthven,et al.  The Effect of Water on the Adsorption of CO2 and C3H8 on Type X Zeolites , 2004 .

[8]  Nada Assaf-Anid,et al.  Curbing the greenhouse effect by carbon dioxide adsorption with Zeolite 13X , 2007 .

[9]  W. Tao,et al.  Effect of Moisture on the Adsorption of Volatile Organic Compounds by Zeolite 13 , 2004 .

[10]  F. Tezel,et al.  Equilibrium and kinetic analysis of CO2-N2 adsorption separation by concentration pulse chromatography. , 2007, Journal of colloid and interface science.

[11]  Esat Alpay,et al.  High Temperature Recovery of CO2 from Flue Gases Using Hydrotalcite Adsorbent , 2001 .

[12]  Wojciech Nowak,et al.  A thermogravimetric study of the adsorption of CO2 on zeolites synthesized from fly ash , 2005 .

[13]  K. Sing.  Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984) , 1985 .

[14]  M. Katoh,et al.  Adsorption of CO2 over univalent cation-exchanged ZSM-5 zeolites , 1993 .

[15]  J. Kwon,et al.  Adsorption Affected by Relationship Between Pore Sizes of Activated Carbons and Physical Properties of Adsorbates , 2007 .

[16]  Mónica Alonso,et al.  Comparison of CaO-Based Synthetic CO2 Sorbents under Realistic Calcination Conditions , 2007 .

[17]  Zou Yong,et al.  Adsorption of carbon dioxide at high temperature—a review , 2002 .

[18]  S. Sircar,et al.  Chemisorption of carbon dioxide on potassium-carbonate-promoted hydrotalcite. , 2007, Journal of colloid and interface science.

[19]  R. Siriwardane,et al.  Adsorption of CO2 on Zeolites at Moderate Temperatures , 2005 .

[20]  S. Sircar,et al.  Adsorption technology for direct recovery of compressed, pure CO2 from a flue gas without pre-compression or pre-drying , 2010 .

[21]  Derek Creaser,et al.  CO2 adsorption on silicalite-1 and cation exchanged ZSM-5 zeolites using a step change response method , 2006 .