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Study of competitive adsorption of the N2O-CO2-CH4-N2 quaternary mixture on CuBTC
مطالعه جذب رقابتی از مخلوط چهارتایی N2O-CO2-CH4-N2 در CuBTC-2020 For the widespread use of Metal Organic Frameworks as adsorbents for gas separation and purification, it is
crucial to understand the multicomponent adsorption mechanism occurring in them. In this paper, we first
provide experimentally consistent and comprehensive set of a quaternary mixture (N2O-CO2-CH4-N2) adsorption
data on CuBTC. The measurements were performed at 297 K using a home-made recirculating volumetric apparatus.
For the first time, we combine existing results from molecular simulations of the single-gas adsorption
and the new experimental quaternary mixture data to get insights in competitive adsorption mechanism. For
pure-component adsorption, the affinity of CuBTC for the components is in the following decreasing order N2O,
CO2, CH4 and N2. A comparison of the components electronic properties shows that the dipole moment and the
polarizability play more role in the adsorption on non-polar adsorbent CuBTC than does the quadrupole moment.
The competition in the mixed adsorbed phase is proven by the big difference between the adsorbed
quantities of all the components in the single-component phase and the mixture. The experimental data unequivocally
confirms that the secondary adsorption sites e.g. sites which adsorption is favoured by adsorption on
primary sites, play an important in the adsorption of all the components on CuBTC. For instance, the fact that the
secondary adsorption sites of some components represent the primary adsorption sites of others is at the origin of
the high competition in adsorption on CuBTC. On the other hand, it is shown that screening adsorbent separation
performance with only pure-component data is not appropriate, as evidenced by the high difference between
selectivities calculated from experimental mixture data and only pure-component isotherms. Moreover, the
working selectivity has been proven to be more useful than the equilibrium selectivity, as it encompasses information
on optimal feed gas and desorption pressures. Keywords: Quaternary mixture adsorption | Competition | CuBTC | Equilibrium selectivity | Working selectivity |
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