CO2 capture and conversion appears to be a prominent solution to mitigate greenhouse gas
emissions (GHG) and global warming issue. Among different CO2 conversion approaches,
CO2 hydrogenation via reverse water gas shift (RWGS) reaction is one of the most promising
technology to convert CO2 to CO. Subsequently, CO is transformed to value added chemicals
or liquid fuels. To improve the overall CO2 conversion for RWGS reaction, product separation
and recycling is being proposed.
In this research, adsorption separation technology has been explored to selectively separate
CO from CO2 in RWGS using pressure swing adsorption (PSA) process. To investigate the
adsorption capacity and selectivity of CO, different porous materials have been identified for
CO separation. In this research, activated carbons, ordered mesoporous silica, and metal
organic framework materials were studied. Equilibrium isotherms of CO and CO2 were
measured in a gravimetric system at a temperature of 25 °C for pressures up to 20 bar.
Preliminary adsorption isotherm results had shown an insufficient CO uptake and low
selectivity level compared to CO2, thus not justifying their application for CO separation.
Herein, to improve the CO adsorption capacity and selectivity, Cu-based adsorbents were
developed using copper (II) chloride (CuCl2) as a precursor to synthesize six different
adsorbents. The adsorbents were prepared using two different synthesis methods; the modified
polyol method for reduction and nanoparticle deposition of Cu (I) ions, and thermal monolayer
auto-dispersion method. Furthermore, different copper (II) loadings were investigated to
determine the monolayer dispersion capacity of CuCl2 on the support.
The modified adsorbents by copper salt exhibited significantly high CO uptake with large
CO/CO2 selectivity, reversing the results obtained before adsorbent modification. Thus, Cubased adsorbents are promising materials for CO separation and recovery from a gaseous mixture containing CO2.
| Identifer | oai:union.ndltd.org:uottawa.ca/oai:ruor.uottawa.ca:10393/42151 |
| Date | 18 May 2021 |
| Creators | Abbassi, Maria |
| Contributors | Tezel, F. Handan |
| Publisher | Université d'Ottawa / University of Ottawa |
| Source Sets | Université d’Ottawa |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
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