Mg¿Al hydrotalcite coating on zeolites for improved carbon dioxide adsorption

Abstract Hydrotalcite was synthesized by co-precipitation using metal nitrate precursor and potassium carbonate with Mg:Al ratio of 3:1. The samples were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) and nitrogen adsorption/desorption. The surface morphology and chemical composition were characterized by scanning electron microscope (SEM) and energy dispersive X-ray (EDX). Characterization of hydrotalcite reveals that hydrotalcite prepared in this work exhibited a type II isotherm which is typical of mesoporous and slit shape pore materials. The hydrotalcite structures demonstrated higher degree of crystallinity when thermally treated at 700 °C. Carbon dioxide adsorption was conducted using adsorption unit and the result showed an increase of CO 2 adsorption when hydrotalcite was coated on commercial zeolites.

[1]  A. Rodrigues,et al.  Adsorption of Carbon Dioxide onto Hydrotalcite-like Compounds (HTlcs) at High Temperatures , 2001 .

[2]  D. Akporiaye,et al.  On the stability of mixed M2+/M3+ oxides , 2002 .

[3]  J. Valim,et al.  Effects of pH, temperature, and ionic strength on adsorption of sodium dodecylbenzenesulfonate into Mg-Al-CO , 2004 .

[4]  E. Kanezaki.  Thermal behavior of the hydrotalcite-like layered structure of Mg and Al-layered double hydroxides with interlayer carbonate by means of in situ powder HTXRD and DTA/TG , 1998 .

[5]  F. Kovanda,et al.  Thermal behaviour of Ni–Mn layered double hydroxide and characterization of formed oxides , 2003 .

[6]  E. López-Salinas,et al.  Thermal behavior of hydrotalcite-like [Mg1-xGax(OH)2](CO3)x/2.mH2O as a function of gallium content , 1997 .

[7]  M. Aramendía,et al.  Synthesis and characterization of a novel Mg/In hydrotalcite-like compound , 2000 .

[8]  D. Crișan,et al.  Thermal behaviour of hydrotalcite-like compounds: study of the resulting oxidic forms , 2000 .

[9]  M. Gazzano,et al.  Thermal evolution and catalytic activity of Pd/Mg/Al mixed oxides obtained from a hydrotalcite-type precursor , 2001 .

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

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

[12]  D. Das,et al.  Studies on Mg/Fe hydrotalcite-like-compound (HTlc) I. Removal of inorganic selenite (SeO3(2-)) from aqueous medium. , 2002, Journal of colloid and interface science.

[13]  R. Dziembaj,et al.  Nickel doped hydrotalcites as catalyst precursors for the partial oxidation of light paraffins , 2001 .

[14]  R. Frost,et al.  Thermal activation of copper oxide based upon the copper hydrotalcite CuxZn6−xAl2(OH)16(CO3)·4H2O , 2003 .

[15]  Dudley H. Williams,et al.  Spectroscopic Methods in Organic Chemistry , 1969 .

[16]  Y. Tamaura,et al.  Synthesis of hydrotalcite with high layer charge for CO2 adsorbent , 1995 .

[17]  G. Ghiotti,et al.  Synthesis and characterization of sol–gel Mg/Al and Ni/Al layered double hydroxides and comparison with co-precipitated samples , 2000 .

[18]  M. Aramendía,et al.  Comparative study of Mg/Al and Mg/Ga layered double hydroxides , 1999 .