Mesoporous Silica Supported Polyethyleneimine for CO2 Capture from Air

6 Pages Posted: 3 Jun 2019

See all articles by Gregory P Knowles

Gregory P Knowles

Monash University - School of Chemistry

Rahad Rahman

Monash University - School of Chemistry

Zoe Veldman

Monash University - School of Chemistry

Alisha Negi

Monash University - School of Chemistry

Alan Loyd Chaffee

Monash University - School of Chemistry

Date Written: October 21, 2018

Abstract

The relative potential of mesoporous silica supported polyethyeleneimine type composites for CO2 direct from air capture (DAC) is investigated via isothermal static fixed volumetric CO2 sorption studies (30, 50 & 75 °C) and the thermogravimetry (20, 40, 50 & 60 °C) of their isothermal processing when fed a 400 ppm CO2 in Ar gas blend. The data derived from the static volumetric dosing technique was found useful for a basic assessment, however it was also found to substantially underestimate the likely capacity of the sorbents achievable during realistic CO2 DAC processing. The thermogravimetry results were found to be directly useful to assess the relative performance of different composites. Branched rather than linear PEI, and larger pore volume support materials, were found to be preferred for the application. The sorption kinetics and capacities of siliceous meso-cellular foam and branched polyethyleneimine composites were found to improve with temperature up to 50 °C. The composite incorporating the greatest amount of the PEI (80 % mesopore volume equivalents) exhibited 1.8 mmol/g CO2 capacity after 55 hours exposure to the gas feed at 50 °C.

Keywords: Capturing CO2 from the air or oceans, GHGT-14, CO2 capture, adsorption, polyethyleneimine, PEI, air.

Suggested Citation

Knowles, Gregory P and Rahman, Rahad and Veldman, Zoe and Negi, Alisha and Chaffee, Alan Loyd, Mesoporous Silica Supported Polyethyleneimine for CO2 Capture from Air (October 21, 2018). 14th Greenhouse Gas Control Technologies Conference Melbourne 21-26 October 2018 (GHGT-14) . Available at SSRN: https://ssrn.com/abstract=3366249

Gregory P Knowles (Contact Author)

Monash University - School of Chemistry ( email )

Victoria, 3800
Australia

Rahad Rahman

Monash University - School of Chemistry

Victoria, 3800
Australia

Zoe Veldman

Monash University - School of Chemistry

Victoria, 3800
Australia

Alisha Negi

Monash University - School of Chemistry

Victoria, 3800
Australia

Alan Loyd Chaffee

Monash University - School of Chemistry ( email )

Victoria, 3800
Australia

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