Evaluation of the Behavior of Hydrotalcite Like-Materials for CO₂ Capture

Abstract:

Several compounds are being investigated for CO₂ capture, besides alkolamines, including solid materials as activated charcoal, zeolites, metal organic frameworks, metal oxides and hydrotalcites. Hydrotalcites, also called layered double hydroxides (LDHs), present some characteristics that are very interesting for CO₂ capture, including their speed to achieve equilibrium and their high regeneration. These compounds can be represented by the general formula [M_1-x²⁺M_x³⁺(OH)₂]^x+ [(A^n-)_x/n.yH₂O]^x, where M²⁺ and M³⁺ are divalent metals and trivalent cations, respectively, and A^n- is an anion of valency n which occupies the interlayer region, and maintains electrical neutrality of these materials. In the present work, we have synthesized specific LDHs, thermally modified for CO₂ sorption. LDH’s were synthesized intercalated with carbonate anions employing the heterogeneous precipitation method, also known as co precipitation method. After LDH's calcination at different temperatures, the formation of oxides was observed with different surface areas and therefore a varied adsorption capacity. The products were characterized by X-ray diffraction, infrared absorption spectroscopy and thermo gravimetric analysis. The maximum efficiency of CO₂ adsorption was observed at reduced pressure with the calcined sample of LDH-CO_3, Mg₂Al which indicates that the material maintained stable and with a high crystallinity. These properties presented for LDH-CO_3, Mg₂Al synthesized in this work indicate that these materials can be good and also cheap candidates for CO₂ capture.

• Periodical: Applied Mechanics and Materials (Volume 830)
• Pages: 3-10
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.830.3
• Online since: March 2016
• Authors: Dantiele W.S. Albuquerque, Elisângela S. Costa, Jussara Lopes de Miranda, Rosana Drumond Gonçalves, Luiza Cristina Moura*
• Keywords: CO₂ Adsorption, Hydrotalcite, Layered Double Hydroxide

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