CO 2 capture capacity of tetraethylenepentamine (TEPA) supported on beta zeolite, SiO 2 , and Al 2 O 3 has been studied by transient flow switching approach and temperature programmed desorption (TPD) technique coupled with diffuse infrared reflectance Fourier transform spectroscopy and mass spectrometry (MS). TEPA/beta zeolite shows the highest CO 2 capture capacity. Adsorbed CO 2 on TEPA/beta zeolite can be characterized as weakly and strongly adsorbed CO 2 . The former desorbs when CO 2 partial pressure decreases; the latter desorbs during TPD. Strongly adsorbed CO 2 is in the form of carbonates interacting with the NH functional groups of TEPA. This interaction caused the NH and CH intensity to decrease. TEPA/Al 2 O 3 showed the lowest CO 2 capture capacity. The infrared results revealed that TEPA/Al 2 O 3 possessed high content of H 2 O, which inhibited CO 2 adsorption.
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Fisher et al. (2009) studied this question.
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