用于钢铁行业烟气CO2直接捕集的吸附剂构建及其吸附机理研究

工业CO2捕集是实现碳减排的重要途径。本项目将针对钢铁行业烟气温度特点，开发在100-200oC区间具有良好CO2捕集性能的固体吸附剂，简化CO2捕集工艺流程，降低成本。100-200oC温度段一直缺乏良好的固体CO2吸附材料，原因是该温度区间与大多材料吸附温度窗口不匹配。为解决该问题，本项目通过前驱体调控策略，构建在目标温度段同时具有物理及化学吸附活性的混合金属氧化物，明确吸附温度及材料理化特性对其CO2吸附活性的影响规律。采取有机阴离子插层及碱金属盐负载对吸附剂进一步优化，通过调控物理、化学吸附点位，提升CO2吸附性能，系统研究吸附剂的循环吸脱附性能、低浓度CO2吸附活性及水的影响等，构建出适用于钢铁行业烟气CO2直接捕集的固体吸附材料。最后，解析改性手段对衍生吸附剂结构的作用机制，明确材料在不同温度下的CO2吸附机理，为我国工业源CO2减排提供技术及理论支持。

Industrial CO2 capture is an important way to achieve the carbon reduction target. Considering the characteristics of flue gas temperature in steel industry, this project aims to simplify the CO2 capture performance and reduce the cost by developing solid adsorbents with excellent CO2 adsorption and capture performance in the range of 100-200 oC. There has been a lack of solid CO2 adsorption materials in the temperature range of 100-200 oC. The reason is that this temperature range does not match the adsorption temperature window of most materials. In order to solve this problem, this project will take the precursor control strategy to construct mixed metal oxide (MMO) materials with both physical and chemical adsorption properties at the target temperature, figure out the influence of the structure and temperature on its CO2 adsorption activity. In order to enhance the adsorption activity, MMO will be optimized through the organic anion intercalation and alkali metal salts promotion to control the physical and chemical adsorption sites. And the cyclic adsorption and desorption performance, low concentration CO2 adsorption activity and the water influence will be systematically tested to develop a solid adsorption material which can be used for direct CO2 capture of flue gas. At last, the modification mechanism of the adsorbent will also be analyzed to clarify the CO2 adsorption mechanism of the material at different temperatures, providing technical and theoretical support for the CO2 emission reduction from industrial sources.