Nanostructured silica as a support for regenerable high-capacity organoamine-based CO2 sorbents

Nanostructured precipitated and fumed silica (nanosilica) were found to be superior supports for the immobilization of various organoamines. The easily prepared solids were found to be regenerable and effective CO 2 absorbents at moderate temperatures from room temperature up to 100 °C. Supported po...

Full description

Saved in:
Bibliographic Details
Published in:Energy & environmental science 2010-01, Vol.3 (12), p.1949-196
Main Authors: Goeppert, Alain, Meth, Sergio, Prakash, G. K. Surya, Olah, George A
Format: Article
Language:English
Subjects:
Absorbents
Carbon dioxide
Nanocomposites
Nanomaterials
Nanostructure
Particle size
Polyetherimides
Sorbents
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Nanostructured precipitated and fumed silica (nanosilica) were found to be superior supports for the immobilization of various organoamines. The easily prepared solids were found to be regenerable and effective CO 2 absorbents at moderate temperatures from room temperature up to 100 °C. Supported polyethylenimines (PEIs), especially branched low-molecular-weight (LMW, M w ca. 800) and high-molecular-weight (HMW, M w ca. 25 000) PEIs were particularly suitable as CO 2 absorbents. Amines with lower molecular weights and lower boiling points such as pentaethylenehexamine (PEH), tetraethylenepentamine (TEP), monoethanolamine (MEA) and diethanolamine (DEA) showed sorbent leaching from the solid absorbents. The addition of poly(ethylene glycol) was found to significantly enhance the subsequently needed desorption of CO 2 from PEI-based solid absorbents. In the preparation of CO 2 absorbents, the particle size of the nanosilica was found to be of advantage compared to other solid supports having similar or higher surface area but larger particle size. Polyethylenimines supported on fumed silica are shown to be effective and easily regenerable CO 2 absorbents at moderate temperature.
ISSN:1754-5692
1754-5706
DOI:10.1039/c0ee00136h