Abstract
Three kinds of inorganic alkali are introduced into tetraethylenepentamine (TEPA) and polyethyleneimine (PEI)-modified MCM-41 as the CO2 adsorbents. X-ray diffraction, N2 adsorption, fourier-transform infrared and thermo gravimetric analysis are used to characterize the surface structures and the thermal stability of adsorbents. Chemical titration method is used to measure the alkali amounts of adsorbents. Thermo-gravimetric analysis with 10% CO2/90% N2 as the simulated flue gas is used to test the CO2 adsorption performance of adsorbents. The results show that all three kinds of inorganic alkali-containing adsorbents exhibit higher CO2 adsorption capability than traditional TEPA and PEI modified samples. Ca(OH)2 and PEI modified samples exhibit the highest adsorption capacity and recyclable property. The introduction of inorganic alkali changes the chemical adsorption mechanism between CO2 and adsorbent surface due to the increased hydroxyl groups. The CO2 adsorption capacities have a linear dependence relation with the alkali amounts of adsorbents, indicating that alkali amount is a critical factor for the exploration of novel adsorbents.
Highlights
The requirement for energy grows rapidly with economic development
The X-ray diffraction (XRD) patterns of MCM-41-TEPA and MCM-41-PEI show the characteristic behavior of MCM-41 structure, but the peak intensity of the 100 face was decreased
We have introduced KOH, CsOH, and Ca(OH)2 into TEPA‐ and PEI‐modified
Summary
The requirement for energy grows rapidly with economic development. In the few decades, fossil fuels will still be the major energy supply. The proportion of energy currently coming from fossil fuelsis around 98% globally. The increase in fossil fuel utilization, correlating with higher CO2 emissions, has become a serious concern [1]. Continuous uncontrolled CO2 emissions may contribute to many environmental deteriorations, such as sea level increases and species extinction. For the past few years, CO2 capture has received significant attention and is being recognized as an urgent mission [2]
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