Abstract
The adsorption properties of N2 and CO2 of MCM-41 and derived alkali-containing samples were analyzed over a wide range of pressures (up to ~4500 kPa) and temperatures (between 30 and 300 °C). The high-pressure and high-temperature experiments were carried out on pure MCM-41 and K- and Na-impregnated derived samples. It was analyzed the influence of pressure and temperature on the CO2 capture capacity on pure and impregnated samples. The adsorption performance was correlated to the structure and textural properties of the materials using X-ray diffraction and N2 adsorption–desorption measurements. The addition of an alkaline element changes the textural properties of the material increasing the pore size, which positively affected the CO2 adsorption capacity of these materials at high pressure. In addition, the isosteric heats of adsorption gave information about the chemical affinity between the impregnated materials and CO2. The CO2 adsorption at ~ 4500 kPa for the samples with 5 wt% Na at 100 and 200 °C were 77.98 and 9.79 mmol g−1, respectively, while the pure MCM-41 adsorbs only 8.92 mmol g−1.
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Acknowledgments
This work was financially supported by the project SENER-CONACYT and M. J. Ramírez-Moreno thanks to CONACYT for financial support.
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Ramírez-Moreno, M.J., Romero-Ibarra, I.C., González-de Gortari, M. et al. CO2 adsorption at high pressures in MCM-41 and derived alkali-containing samples: the role of the textural properties and chemical affinity. J Porous Mater 23, 1155–1162 (2016). https://doi.org/10.1007/s10934-016-0173-4
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DOI: https://doi.org/10.1007/s10934-016-0173-4