Adsorption of CO_2 by Porous Molecular Sieves under Different Doping Modes of Triethylenetetramine

Yunlong Zhou ； Jian Wang ； Weihao Li ； Xiaotian Hu

《World Scientific Research Journal》 7卷5期 (2021/05) Pp. 272-284

https://doi.org/10.6911/WSRJ.202105_7(5).0028

摘要

The effects of different doping modes of TETA on the structural properties, CO_2 adsorption and reutilization of the two-dimensional hexagonal mesoporous molecular sieve (SBA-15) were studied by means of grafting and impregnation. The results showed that both the grafting method and the impregnation method could uniformly doping the SBA-15 with TETA, and the pore volume of SBA-15 decreased. On the premise that the doping amount of triethylenetetramine is the same, because the impregnation method completely USES the channel of SBA-15 to absorb triethylenetetramine (TETA), the channel plugging of SBA-15 is more obvious than that of the grafting method. Both models doped with triethylenetetramine (TETA) could significantly improve the adsorption selectivity of the mesoporous molecular sieve SBA-15 for CO_2, but only the grafting method significantly promoted the adsorption amount of CO_2 of the mesoporous molecular sieve SBA-15 (from 2.1mmol/g to 2.5mmol/g;0 °C and 0.1 MPa);On the contrary, the impregnation method due to excessive plugging of SBA-15 channels and embedding of the adsorption site of TETA, the adsorption amount of CO_2 decreased instead (only 1.9mmol/g;0 °C and 0.1 MPa). The mesoporous molecular sieve SBA-15 grafting with triethylenetetramine (TETA) showed higher cyclic stability, and had the same excellent reusability as the mesoporous molecular sieve SBA-15.

關鍵字

Mesoporous molecular sieve ； Carbon dioxide ； Capture ； Adsorption ； Porous material

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