Mesoporous silica supported polyethyleneimine for CO2 capture from air

Gregory P. Knowles, Rahad Rahman, Zoe Veldman, Alisha Negi, Alan L. Chaffee

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

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.

Original languageEnglish
Title of host publicationSSRN
Subtitle of host publicationGHGT 2018 - 14th International Conference on Greenhouse Gas Control Technologies
Number of pages6
DOIs
Publication statusPublished - 2018
EventInternational Conference on Greenhouse Gas Control Technologies 2018 - Melbourne, Australia
Duration: 21 Oct 201825 Oct 2018
Conference number: 14th
https://ghgt.info (Website)

Conference

ConferenceInternational Conference on Greenhouse Gas Control Technologies 2018
Abbreviated titleGHGT 2018
Country/TerritoryAustralia
CityMelbourne
Period21/10/1825/10/18
Internet address

Keywords

  • adsorption
  • air
  • CO capture
  • PEI
  • polyethyleneimine

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