Effect of Pore Structure on CO₂ Adsorption Characteristics of Aminopolymer Impregnated MCM-36

Abstract

The CO2 adsorption characteristics of a pillared 2-dimensional porous silicate material impregnated with amine containing polymers have been investigated. It was determined that the introduction of amine polymer deteriorates the CO2 capture kinetics of the MCM-36 supported amine adsorbents compared to that of the bare material, due to the fact that with the addition of a higher loading of amine polymer the diffusion of CO2 through the 2-dimensional interlayer mesoporous channels of MCM-36 becomes greatly hindered. This pore blocking sets an upper limit to the CO2 capture performance of the polymer impregnated MCM-36 and greatly reduces the utility of using this sort of amine-solid adsorbent for carbon capture. Interestingly, these results suggest that for 2-D channel solid supports there is an optimal amine loading which is not likely to be equal to the maximum loading, and which can be determined and utilized to obtain the maximum improvement over the original materials. The study performed in this work for the MCM-36 material could therefore be applied to other porous supports to determine these optimum loadings and be used to more easily compare and contrast the alterations to capture characteristics which occur upon amine loading for a wide range of materials. It is believed this will make it more straightforward to determine which solid supports hold the promise for greatly improved capture characteristics upon amine loading and allow the field to more quickly determine avenues for fruitful development. These results also suggest the need for a new sort of support structure for amine loaded solids, one which can allow us to decouple amine loading from increasing diffusion resistance so that high amine efficiency can be maintained throughout the range of increased amine loadings.

CO2 Capture Partner Molecules in Highly Loaded PEI Sorbents

“…5 The latter is a commonly dominant limitation in highly loaded polyamines. [6][7] Unfavourable uptake kinetics of highly loaded amino-polymer sorbents at ambient temperature has been extensively reported in previous studies. Several groups studied PEI and 4 observed higher CO 2 capture capacity with increasing temperature.…”

Functionalization of Metal–Organic Frameworks for Enhanced Stability under Humid Carbon Dioxide Capture Conditions

“…The integration of amine‐containing moieties, such as ethylenediamine (ED) or polyethyleneimine, onto porous inorganic materials such as zeolites and mesoporous silica is a well‐known technique to prepare supported amine chemisorbents . These supported amine adsorbents are classified into class 1, 2, and 3 adsorbents according to the characteristics of the interactions between the inorganic support and the amines .…”

“…[9,[18][19][20] The integrationo fa mine-containing moieties, such as ethylenediamine (ED) or polyethyleneimine, onto porous inorganic materials such as zeolitesa nd mesoporouss ilica is aw ellknownt echnique to prepares upported amine chemisorbents. [21][22][23][24][25][26][27][28][29][30] These supported amine adsorbents are classified into class 1, 2, and 3a dsorbents according to the characteristics of the interactions between the inorganic support and the amines. [5] Among these,c lass 2a dsorbents comprise amine groupsb ound chemically to the surface functional groups of the support such as surfaces ilanols in zeolites or mesoporous silica.…”

Facilely synthesized meso-macroporous polymer as support of poly(ethyleneimine) for highly efficient and selective capture of CO2

“…It is well established that the textural properties of the support have a significant impact on the dispersion of PEI in the inner pores of the support. [29,38,50] Since the PEI typically used has a large molecular size (M w =800), a support with large pores is considered to be a good choice for PEI impregnation. Figure 1 shows the N 2 adsorption isotherms at −196°C and the pore size distributions of the PDVB support and PEI-PDVB composites, and the calculated textural properties are summarized in In light of the highly interesting meso-macroporous structure of PDVB, four PEI-PDVB composites with different PEI loadings were prepared in this work.…”