Influence of the compensating cation in LTA zeolite on the CO2 adsorption process

Influence of the compensating cation in LTA zeolite on the CO2 adsorption process

• Autor
• Aryandson da Silva
• Co-autores
• Janielly Maria Silva Duarte , Mariele Iara Soares de Mello , Sibele Berenice Castellã Pergher
• Resumo

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  The presence of CO2 in the atmosphere is a global problem. to mitigate this, it is necessary to study materials that have the capacity to adsorb it in different processes. Thus, the objective of this study was to evaluate the influence of different cations in the zeolite structure in the CO2 adsorption process. For this, the LTA zeolite was synthesized following the IZA standard and subsequently carried out the cation exchange process of Na+ and the cations Li+, NH4+, H+, Ca2+, Mg2+, Sr2+ and Ba2+, these materials were applied in two adsorption processes, the first evaluating the maximum adsorption capacity at high pressures with pure gas, and the second in a fixed bed with adsorption in a gas mixture containing 450 ppm of CO2 in He and a flow of 0.1 L/min. Initially, it was possible to observe that the cation exchanges were carried out successfully, however, some cations ended up significantly reducing the intensity of the peaks, showing that there was an amorphization of the structure. In the adsorption processes it was seen that the exchange for the Ca2+ cation improved the capacity of maximum adsorption of the material, increasing from 3.56 mmol/g to 4.85 mmol/g. In the gas mixture in a fixed bed, the material that stood out was the exchange for Sr2+, increasing from 0.0821 mmol/g to 0.2250 mmol/g. Concluding that, depending on the application, the choice of the structure cation is extremely important to achieve the desired result.

• Palavras-chave
• CO2 adsorption, chemissorption, physissorption, zeolites, exchange cation.
• Área Temática
• Sintese e Caracterização