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Temperature-programmed desorption of CO2 from polyethylenimine-loaded SBA-15 as molecular basket sorbents

Paper ID Volume ID Publish Year Pages File Format Full-Text
54972 47034 2012 9 PDF Available
Title
Temperature-programmed desorption of CO2 from polyethylenimine-loaded SBA-15 as molecular basket sorbents
Abstract

In this work, we conducted a study on temperature-programmed desorption (TPD) of CO2 over molecular basket sorbent (MBS) consisting of polyethylenimine (PEI) immobilized in mesoporous silica SBA-15. A series of MBS sorbents with different PEI loadings in SBA-15 have been studied for CO2-TPD to gain an insight into the fundamental characteristics of CO2 sorption/desorption mechanism. Effects of sorption temperature, sorption time, and PEI molecular weight on the CO2 sorption capacity and desorption behavior of 50 wt% PEI/SBA-15 sorbent were also examined. The results show that two PEI layers, i.e., the exposed PEI layer and the inner bulky PEI layer may exist in PEI/SBA-15 sorbents, and their proportions vary with PEI loading and sorption temperature. Consequently, a two-layer model for CO2 sorption over PEI/SBA-15 sorbent is proposed, which rationalizes the sorption results with consideration of CO2 sorption kinetics and thermodynamics. It was also found that CO2 sorption capacity decreases with increasing PEI molecular weight, which may be mainly attributed to the decrease of primary amine content and the increase of tertiary amine content as well as increased interactions between polymeric chains in the PEI molecules.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (256 K)Download as PowerPoint slideHighlights► CO2-TPD study provides an insight into the CO2 sorption mechanism over PEI-SBA-15-based MBS. ► The exposed PEI layer and the inner bulky PEI layer may exist and their proportions vary with PEI loading and sorption temperature. ► A two-layer model for CO2 sorption over PEI/SBA-15 sorbent is proposed and discussed.

Keywords
CO2 capture; TPD; Adsorption; Molecular basket sorbent; Flue gas; Mesoporous molecular sieve; Polyethylenimine-SBA-15
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Temperature-programmed desorption of CO2 from polyethylenimine-loaded SBA-15 as molecular basket sorbents
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 194, Issue 1, 30 October 2012, Pages 44–52
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us