AlPO 4 -14 molecular sieve was prepared by hydrothermal crystallization of saturated gels. The synthesized molecular sieve was characterized by X-ray diffraction and scanning electron microscopy. For the first time, the adsorption behavior of CO 2 and CH 4 was investigated on AlPO 4 -14, a neutral molecular sieve with no extra-framework cations. Adsorption isotherms of CO 2 and CH 4 on AlPO 4 -14 were examined at 273 and 300 K. Henry’s law constants and isosteric heats of adsorption of all adsorbates were determined from adsorption isotherms. It was found that CO 2 was strongly adsorbed on the molecular sieve, and the selectivity of CO 2 /CH 4 can reach as high as 21.77 at 273 K. The adsorbate−adsorbent interaction and the steric effect should be responsible for the preferential adsorption of CO 2 on AlPO 4 -14.
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Zhao et al. (2009) studied this question.
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