Oil and Gas Excellence Department, Faculty of Chemical Engineering, University of Tehran, P.O. Box 11155-4563 Tehran, I.R. IRAN
Fine particles Silicoaluminophosphate-34 were synthesized by hydrothermal sol-gel method. The effect of crystallization time, as one of the important synthesis factors on particle size and crystallinity, kinetic and equilibrium adsorption, and selectivity of CO2 / CH4 has been studied in this work. The adsorption isotherms are obtained at moderate gauge pressures (100-3000 kPa) and temperatures (278, 288 and 298 K), and the equilibrium adsorption parameters as well as heat of adsorption are determined for the synthesized SAPO-34. The observed adsorption selectivity of CO2 to CH4 was determined to be around eight for that sample with higher degree of crystallinity.The crystallinity, isotherm parameters, adsorption selectivity and heat of adsorption confirm that the synthesized fine particle of SAPO-34 could be a good candidate for separation of CO2 from CH4.
 Hong M., Li S., Funke H.F., Falconer J.L., Noble, R.D. Ion-Exchanged SAPO-34 Membranes for Light Gas Separations, Micro. and Meso. Mat., 107, p. 140 (2007).
 Mertens M., Strohmaier K.G., Nurray P., Process for Manufacture of Molecular Sieves, US. Pat. No. 6903240 B2 (2005).
 Mertens M., Strohmaier K.G., Nurray P., Process for Manufacture of Molecular Sieves, US. Pat. No. 7052664 B2 (2006).
 Gholamhosseiny M., Fatemi Sh., Rasoolzadeh M., Hydrogen Adsorption and Equilibrium Models on Multi-Walled Carbon Nanotubes at Moderate Temperatures and Pressures, Inter. J. of Chem. Reac. Eng., 6, p. 84 (2008).
 Tosheva, L., Valtchev, V.P., High-Silica Zeolite-β: From Stable Colloidal Suspensions to Thin Films, Chem. Mat., 17, p. 2494 (2005).
 Newalker B.L., Choudary N.V., Kumar P., Komarneni, S., Bhat, T.S.G., Exploring the Potential of Mesoporous Silica, SBA-15, as an Adsorbent for Light Hydrocarbon Separation, Chem. Mater., 14, p. 304 (2002).
 Li S., Falconer J.L., Noble R.D., SAPO-34 Membranes for CO2/CH4 Separation, J. of Mem. Sci., 241, p. 121 (2004).
 Li S., Falconer J.L., Noble R.D., SAPO-34 Membranes for CO2/CH4 Separation: Effect of Si/Al Ratio, Micro. and Meso. Mat., 110, p. 310 (2008).