Nabil El Hadri

Preparation of Polyethylenimine Impregnated Mesoporous Precipitated Silica for CO2 Capture

Abstract In this study, a novel and inexpensive CO 2 adsorbent has been prepared by impregnating polyethyleneimine (PEI) onto mesoporous precipitated silica. The study indicates that the CO 2 adsorption capacity of the prepared adsorbent increases with the increase in PEI loading. The maximum adsorption capacity of adsorbent can be achieved at 75 o C. In pure CO 2 , at 75 o C and 1 bar, adsorbent containing 60% PEI can adsorb 199.6 mg of CO 2 /g. The adsorption capacity of an adsorbent impregnated with 55% PEI (PEI-MPS-55) measured at the heat equilibrium reduced from 128 mg/g to 117 mg/g and 101 mg/g as CO 2 concentration varies from 100 to 15% and 4%, respectively. The adsorption heat calculated ranges from 68─75 kJ/mole of CO 2 . The cyclic adsorption-desorption studies revealed that the adsorbent is relatively stable; the CO 2 loading was not changed after 20 cycles of adsorption/regeneration at 75/90 o C. Keywords : Adsorption capacity; CO 2 capture; Regeneration; Adsorbent; Precipitated silica.

Amine-Blends Screening and Characterization for CO2 Post-combustion Capture

Amines have been identified as one of the most promising agents to capture CO2 released from industrial and energy sources to the atmosphere. The primary aim of this chapter is to present experimental results showing the two major factors considered in the selection of suitable amine solvents for carbon capture in post-combustion technology. Ten amines were selected from varying classes and structure types, and were investigated on the basis of CO2 loading and heat of absorption. These solvents were selected based on the preliminary experimental results and the effect of blending the best reacting solvents was further investigated. Details of the experimental procedure and results are discussed as well as the relevant conclusions.