Abstract
AbstractThe synthesis of a mesoporous γ‐Al2O3 nanorod/reduced graphene oxide (γ‐Al2O3NR/RGO) composite with a higher surface area and thermal conductivity than unmodified γ‐Al2O3 has been accomplished, and these materials were characterized in detail. The composite was used successfully as a support for poly(ethylenimine) (PEI) to capture CO2 at high temperature. The PEI‐modified composite (γ‐Al2O3NR/RGO/PEI) showed an excellent CO2 adsorption from simulated flue gas at 75 °C and complete desorption at 100 °C with recyclability. The maximum CO2 adsorption capacity of this material was 200.6 mg gPEI−1 (1.14 mmol CO2 gadsorbent−1) with an amine efficiency of 0.22, which is higher than that of bare γ‐Al2O3/PEI. As a result of its high thermal conductivity, the overheating of the adsorbent during exothermic CO2 adsorption by PEI was restricted and as a result the thermal degradation of PEI was prevented. Accordingly, the adsorption capacity of γ‐Al2O3NR/RGO/PEI does not deteriorate like that of bare γ‐Al2O3/PEI during repeated CO2 adsorption–desorption cycles.
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