(406b) Selective Separation of CO from CO2 By Cu Cl Based Adsorbents | AIChE

(406b) Selective Separation of CO from CO2 By Cu Cl Based Adsorbents


Abbasi, M. - Presenter, Natural Resources Canada
Zanganeh, K., Natural Resources Canada
Tezel, F. H., University of Ottawa
The separation of carbon monoxide (CO) from gaseous mixtures containing carbon dioxide (CO2) by different adsorbents has been studied. Experimental results from literature had shown that most adsorbents are CO2 selective and the CO uptake and selectivity over different adsorbents is not sufficient.

In this study, adsorbents were developed through adsorbent modifications with Copper (II) chloride (CuCl2) as precursor to improve CO uptake and selectivity. Herein, the adsorbents were prepared using two different approaches: through the thermal monolayer dispersion method and through a modified Polyol method. The experimental adsorption isotherms of pure CO and CO2 in studied adsorbents including activated carbon, metal organic framework and ordered mesoporous silica were performed at 298 K and pressures up to 20 bar. Results showed that the CO adsorption capacity improved significantly while CO2 adsorption decreased in modified adsorbents. The strong π complexation between Cu+ ions and CO have proven to enhance the CO adsorption uptake and selectivity while reducing the CO2 uptake. The CO selectivity achieved was 4.3 in modified activated carbon CuCl/Xtrusorb compared to 0.2 before modification at 100 KPa and 298 K. Moreover, copper loading of 7mmol/g reached highest CO selectivity compared to 3 and 5 mmol/g copper loading. Sample characterizations were performed by X-Ray diffraction (XRD) and N2 adsorption at 77 K for BET surface area analysis. The characterization results suggested that CuCl2 salt is completely reduced to CuCl dispersed on the surface of the adsorbents. Adsorption isotherms were well described by dual site Langmuir and Sips models.