High temperature adsorption of CO2 on Mg–Al hydrotalcite: Effect of the charge compensating anions and the synthesis pH

Abstract This work reported a detailed investigation on how charge compensating anions and synthesis pH affect the structural properties and CO2 adsorption capacity of Mg–Al hydrotalcites (HTs). A series of Mg3Al1–A (A = CO32−, HCO3−, NO3−, SO42−, and Cl−) HTs were synthesized and tested as high temperature CO2 adsorbents. It was found that the anions have great effect on the thermal stability and morphology, as well as on the surface area of HTs, consequently influencing the CO2 adsorption capacity of HT derivatives. Among various HTs, Mg3Al1–CO3 showed the highest CO2 adsorption capacity of 0.53 mmol/g. Next, the influence of synthesis pH on the Mg/Al ratio, BET surface area, pore size, and CO2 adsorption capacity of Mg3Al1–CO3 was investigated. Mg3Al1–CO3 synthesized at pH = 10–12 showed good performance for CO2 adsorption. By doping Mg3Al1–CO3 (pH = 10) with 20 wt.% K2CO3, the CO2 adsorption capacity was increased up to 0.85 mmol/g.

[1]  Xin Deng,et al.  Activation of Mg-Al hydrotalcite catalysts for transesterification of rape oil , 2008 .

[2]  Zhi Ping Xu,et al.  Influence of Water on High-Temperature CO2 Capture Using Layered Double Hydroxide Derivatives , 2008 .

[3]  M. Sahimi,et al.  A study by in situ techniques of the thermal evolution of the structure of a Mg–Al–CO3 layered double hydroxide , 2002 .

[4]  Mohd Roslee Othman,et al.  Mg¿Al hydrotalcite coating on zeolites for improved carbon dioxide adsorption , 2006 .

[5]  P. Bosch,et al.  DTA-TGA and FTIR spectroscopies of sol-gel hydrotalcites: aluminum source effect on physicochemical properties , 1997 .

[6]  Ruud W. van den Brink,et al.  Hydrotalcite as CO2 Sorbent for Sorption-Enhanced Steam Reforming of Methane , 2006 .

[7]  Luciaan Boels,et al.  The crucial role of the K+-aluminium oxide interaction in K+-promoted alumina- and hydrotalcite-based materials for CO2 sorption at high temperatures. , 2008, ChemSusChem.

[8]  Zou Yong,et al.  Hydrotalcite-like compounds as adsorbents for carbon dioxide , 2002 .

[9]  N. Hutson,et al.  High temperature adsorption of CO2 on various hydrotalcite-like compounds , 2008 .

[10]  R. Patel,et al.  Nitrate sorption by thermally activated Mg/Al chloride hydrotalcite-like compound. , 2009, Journal of hazardous materials.

[11]  Robert J. Davis,et al.  Investigation of the surface structure and basic properties of calcined hydrotalcites , 1992 .

[12]  Douglas P. Harrison,et al.  Hydrogen Production Using Sorption-Enhanced Reaction , 2001 .

[13]  A. L. Ortíz,et al.  Hydrogen from methane in a single-step process , 1999 .

[14]  Shigeo Miyata,et al.  Synthesis of Hydrotalcite-Like Compounds and their Physico-Chemical Properties—The Systems Mg2+-Al3+-SO42− and Mg2+-Al3+-CrO42− , 1977 .

[15]  Alírio E. Rodrigues,et al.  CO2 sorption on hydrotalcite and alkali-modified (K and Cs) hydrotalcites at high temperatures , 2008 .

[16]  Yan Liu,et al.  The effect of trivalent cations on the performance of Mg-M-CO(3) layered double hydroxides for high-temperature CO(2) capture. , 2010, ChemSusChem.

[17]  Fabrizio Cavani,et al.  Hydrotalcite-type anionic clays: Preparation, properties and applications. , 1991 .

[18]  G. Lu,et al.  Dispersion and size control of layered double hydroxide nanoparticles in aqueous solutions. , 2006, The journal of physical chemistry. B.

[19]  Christopher W. Jones,et al.  Adsorbent materials for carbon dioxide capture from large anthropogenic point sources. , 2009, ChemSusChem.

[20]  D. Jansen,et al.  Sorption-enhanced hydrogen production for pre-combustion CO2 capture: Thermodynamic analysis and experimental results , 2007 .

[21]  Jie Cheng,et al.  High-temperature adsorption of carbon dioxide on mixed oxides derived from hydrotalcite-like compounds. , 2008, Environmental science & technology.

[22]  J. D. Costa,et al.  Layered Double Hydroxides for CO2 Capture: Structure Evolution and Regeneration , 2006 .

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

[24]  Ki Bong Lee,et al.  Performance of Na2O promoted alumina as CO2 chemisorbent in sorption-enhanced reaction process for simultaneous production of fuel-cell grade H2 and compressed CO2 from synthesis gas , 2008 .

[25]  Y. Lwin,et al.  High temperature adsorption of carbon dioxide on Cu–Al hydrotalcite-derived mixed oxides: kinetics and equilibria by thermogravimetry , 2009 .

[26]  E. A. Payzant,et al.  Structural Effects on the High Temperature Adsorption of CO2 on a Synthetic Hydrotalcite , 2004 .

[27]  H. Jakobsen,et al.  Hydrogen Production by Sorption-Enhanced Steam Methane Reforming Using Lithium Oxides as CO2-Acceptor , 2007 .

[28]  Chau-Chung Han,et al.  Polymeric fullerene oxide films produced by decomposition of hexanitro(60)fullerene , 2004 .

[29]  T. Golden,et al.  Markedly Improved CO2 Capture Efficiency and Stability of Gallium Substituted Hydrotalcites at Elevated Temperatures , 2009 .

[30]  Qiang Wang,et al.  CO2 capture by solid adsorbents and their applications: current status and new trends , 2011 .

[31]  T. Fukui,et al.  Effect of added basic metal oxides on CO2 adsorption on alumina at elevated temperatures , 1998 .

[32]  D. Harrison.  Sorption-Enhanced Hydrogen Production: A Review , 2008 .

[33]  Shigeo Miyata.  The Syntheses of Hydrotalcite-Like Compounds and Their Structures and Physico-Chemical Properties—I: the Systems Mg2+-Al3+-NO3−, Mg2+-Al3+-Cl−, Mg2+-Al3+-ClO4−, Ni2+-Al3+-Cl− and Zn2+-Al3+-Cl− , 1975 .