Efficient adsorbents
are critical to the purification of liquefied
natural gas (LNG) by the adsorption method. In this study, the physiochemical
properties of JLOX-500 and 13X were examined. JLOX-500 with more Al
content had a more compact unit cell, a larger surface area and pore
volume, a smaller average pore size, and more microchannels on the
surface than 13X. The separation performance of the two adsorbents
was evaluated by the adsorption experiment. The CO
2
adsorption
capacity of JLOX-500 was higher than that of 13X, while the equilibrium
and ideal selectivity and separation factor of CO
2
/CH
4
were also larger for JLOX-500. Especially in dynamic adsorption,
the CO
2
adsorption capacities at 50 ppm of the gas mixture
at the outlet were 3.46 and 1.64 mmol/g for JLOX-500 and 13X, respectively.
The adsorption heats of CO
2
and CH
4
on JLOX-500
were 40.50 and 18.77 kJ/mol, whereas these values were 31.49 and 18.50
kJ/mol for 13X, respectively. A better separation performance for
JLOX-500 was observed because of fewer binders and a lower Si/Al ratio
(1.34). The Toth adsorption isotherm model described best the experimental
data. According to the results of this study, JLOX-500 was a more
efficient adsorbent used in purification for LNG production at high
pressure with low CO
2
concentration.
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