Insights into CO2 and CH4 adsorption by pristine and aromatic amine-modified periodic mesoporous phenylene-silicas

Lourenço, Mirtha A.O. and Siquet, Christophe and Santos, João Carlos and Jorge, Miguel and Gomes, José R. B. and Ferreira, Paula (2016) Insights into CO2 and CH4 adsorption by pristine and aromatic amine-modified periodic mesoporous phenylene-silicas. Journal of Physical Chemistry C, 120 (26). 14236–14245. ISSN 1932-7447

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    Abstract

    The synthesis and characterization of pristine and amine-functionalized periodic mesoporous phenylene-silicas having different pore sizes are reported. We explore the potential of these materials for CO2/CH4 separation, by studying the adsorption of pure CO2 and pure CH4 gases. The aminated periodic mesoporous phenylene-silica with the smallest pore size is the best adsorbent to CO2, presenting a Henry’s constant of 0.56 mol·kg-1·bar-1 at 35 ºC. However, the corresponding Henry’s constant for CH4 is extremely low (0.06 mol·kg-1·bar-1 at 35 ºC). It is observed a direct correlation between the % of T2SMP silanols species and the values of the Henry’s constants, which may be used to theoretically predict experimental CO2 Henry’s constants of potential adsorbents.