Abstract：CO₂emission during coal combustion is one cause of climate change. The preparation of efficient CO₂adsorbent is vital for capturing CO₂from flue gas at high temperature. Li₂CO₃, Li OH and LiNO₃were used to prepare Li₂CuO₂sorbents for capturing CO₂of coal combustion. The X-ray diffraction ( XRD) , scanning electron microscope ( SEM) and X-ray photoelectron spectroscopy ( XPS) were used to analyze the microstructure of three kinds of Li₂CuO₂. The thermal gravimetric analysis ( TGA) was used to test the adsorption performance, and the kinetic characteristics of sorbents were analyzed by the first-order reaction model. The results show that Li₂CuO₂made by Li₂CO₃has higher purity, higher adsorption efficiency, smaller grain size and larger kinetic constant and the chemical adsorption process requires lower activation enthalpy, which is more conductive to CO₂absorption. Therefore, Li₂CuO₂is a potential high-temperature CO₂adsorbent, which can capture CO₂directly from flue gas at high temperature.

Keyword：Li2CuO2;CO2 capture;reaction kinetics;microstructure;adsorbent;