Article ID Journal Published Year Pages File Type
156133 Chemical Engineering Science 2011 8 Pages PDF
Abstract

Serials of pitch based spherical activated carbons (PSACs) were prepared and used as adsorbent for CO2 adsorption from flue gases. The results indicate that the ultrafine micropores (<1 nm) are effective pores for CO2 adsorption, and the equilibrium adsorption capacity of CO2 has a linear relationship with the specific surface area of ultrafine micropores (S<1 nm). The adsorption capacity of CO2 can obtain 1.12 mmol/g at 15 kPa and 30 °C on one of PSAC sample due to its high S<1 nm (845 m2/g). Because the molecular CO2 can be polarized into polar molecules and has four kinds of adsorption configuration, the adsorption selectivities of CO2 vs. N2 and O2 are 86.99% and 69.91%, respectively. When the combined Electric Swing Adsorption and Vacuum Swing Adsorption were applied for CO2 desorption, about 100% desorption efficiency can be obtained, the desorption rate is twice of that with Temperature Swing Adsorption (TSA) and the energy consumption is only 69% of that with TSA.

► Spherical activated carbon as adsorbent for CO2 capture with a low pressure drop. ► The ultrafine micropores play a crucial role on the adsorption capacity of CO2. ► Molecular CO2 can be polarized and has four kinds of adsorption configurations. ► A high desorption efficiency was obtained using the combined ESA–VSA.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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