Study of carbon dioxide and methane equilibrium adsorption on silicoaluminophosphate-34 zeotype and T-type zeolite as adsorbent

Carbon dioxide is known as a hazardous material with acidic property that can be found as impurity in natural gas reservoirs with a broad range of 2 up to 40 %. Therefore, many efforts have been directed to remove and separate carbon dioxide from methane to prevent corrosion problems as well as improving the natural gas energy content. In this study, two molecular sieves, silicoaluminophosphate-34 (SAPO-34) zeotype and T-type zeolite, were synthesized by the hydrothermal method for the comparative study of adsorptive separation of carbon dioxide from methane. The synthesized adsorbents were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and Brunner–Emmett–Teller techniques. These characterization tests confirmed formation of both materials with acceptable crystallinity. Both adsorbents were tested in equilibrium adsorption experiments in order to evaluate maximum capacity and adsorption affinity. Adsorption capacity of carbon dioxide and methane on SAPO-34 and zeolite T were measured in a pressure range of 0.1–2.0 MPa and temperature of 288, 298, and 308 K and fitted with the Sips and Langmuir isotherm models. The ideal selectivity of CO2/CH4 was determined for SAPO-34 and zeolite T at the studied pressures and temperatures, indicating that the molecular sieves can be properly used for CO2–CH4 separation or CO2 capturing from natural gas.

[1]  L. Kevan,et al.  Catalytic Study of Methanol-to-Olefins Conversion in Four Small-Pore Silicoaluminophosphate Molecular Sieves: Influence of the Structural Type, Nickel Incorporation, Nickel Location, and Nickel Concentration , 2000 .

[2]  K. Jun,et al.  Methanol conversion on SAPO-34 catalysts prepared by mixed template method , 2007 .

[3]  P. Webley,et al.  Cage and Window Effects in the Adsorption of n-Alkanes on Chabazite and SAPO-34 , 2008 .

[4]  N. Xu,et al.  Synthesis of zeolite T by microwave and conventional heating , 2009 .

[5]  N. P. Evmiridis,et al.  Synthesis and characterization of an offretite/erionite type zeolite , 1996 .

[6]  P. Harlick,et al.  Adsorption of carbon dioxide, methane and nitrogen: pure and binary mixture adsorption for ZSM-5 with SiO2/Al2O3 ratio of 280 , 2003 .

[7]  Yining Huang,et al.  A solid-state NMR study of the formation of molecular sieve SAPO-34. , 2009, Solid state nuclear magnetic resonance.

[8]  J. Falconer,et al.  SAPO-34 membranes for CO2/CH4 separation , 2004 .

[9]  J. A. Delgado,et al.  Adsorption equilibrium of carbon dioxide, methane and nitrogen onto Na- and H-mordenite at high pressures , 2006 .

[10]  H. Kita,et al.  Zeolite T membrane: preparation, characterization, pervaporation of water/organic liquid mixtures and acid stability , 2004 .

[11]  P. Kościelniak,et al.  Experimental designs applied to hydrothermal synthesis of zeolite ERI+OFF (T) in the Na2O–K2O–Al2O3–SiO2–H2O system: Part 3. Mathematical models and geometrical forms of the relationship between product properties and synthesis parameters: an attempt to optimize synthesis conditions , 1999 .

[12]  S. Cȩckiewicz.  Effect of cation exchange in T-type zeolite on the IR spectra of sorbed methanol , 1980 .

[13]  J. Mougenel,et al.  Ionic conductivity of offretite, erionite, and zeolite T: application to the determination of stacking faults , 1991 .

[14]  Y. Mortazavi,et al.  Performance of CaX Zeolite for Separation of C2H6, C2H4, and CH4 by Adsorption Process; Capacity, Selectivity, and Dynamic Adsorption Measurements , 2010 .

[15]  P. Kościelniak,et al.  Experimental designs applied to hydrothermal synthesis of zeolite ERI + OFF(T) in the Na2O-K2O-Al2O3-SiO2-H2O system. Part 2. Regular study , 1999 .

[16]  R. Baker.  Future directions of membrane gas separation technology , 2002 .

[17]  Michael A. Henson,et al.  Optimization-based design of spiral-wound membrane systems for CO2/CH4 separations , 1998 .

[18]  D. Do,et al.  Adsorption analysis : equilibria and kinetics , 1998 .

[19]  H. Kita,et al.  Preparation and gas separation performance of zeolite T membrane , 2004 .

[20]  María A. Uguina,et al.  Carbon Dioxide/Methane Separation by Adsorption on Sepiolite , 2007 .

[21]  R. Serna-Guerrero,et al.  Adsorption of CO2 from dry gases on MCM-41 silica at ambient temperature and high pressure. 1: Pure CO2 adsorption , 2009 .

[22]  J. Falconer,et al.  Separation of light gas mixtures using SAPO-34 membranes , 2000 .

[23]  P. Harlick,et al.  Adsorption of carbon dioxide, methane, and nitrogen: pure and binary mixture adsorption by ZSM-5 with SiO2/Al2O3 ratio of 30 , 2002 .

[24]  M. Hosseini,et al.  Study of Methane Storage and Adsorption Equilibria in Multi-Walled Carbon Nanotubes , 2008 .

[25]  M. Sadrzadeh,et al.  CO2 and CH4 permeation through T-type zeolite membranes : Effect of synthesis parameters and feed pressure , 2008 .

[26]  Gerardo J. Ruiz-Mercado,et al.  Separation of CO2 from Light Gas Mixtures using Ion-Exchanged Silicoaluminophosphate Nanoporous Sorbents , 2008 .

[27]  M. Pinto,et al.  Selective adsorption of carbon dioxide, methane and ethane by porous clays heterostructures , 2008 .

[28]  Carlos A. Grande,et al.  Adsorption Equilibria and Kinetics of Propane and Propylene in Silica Gel , 2001 .

[29]  R. Hernández-Huesca,et al.  Adsorption equilibria and kinetics of CO2, CH4 and N2 in natural zeolites , 1999 .

[30]  Xiaoliang Xu,et al.  Adsorption separation of carbon dioxide, methane and nitrogen on monoethanol amine modified β-zeolite , 2009 .

[31]  Shuji Himeno,et al.  Characterization and selectivity for methane and carbon dioxide adsorption on the all-silica DD3R zeolite , 2007 .