吸附法捕集CO2具有节能、可回收高纯度CO2等优点，技术核心是吸附剂。如何提高吸附剂对CO2的吸附效率和选择性，降低吸附剂的价格及再生成本是实际应用的瓶颈。本项目对此提出了新的解决对策：(1)利用多年研究的内蒙古武家梁选煤厂煤矸石，通过非晶态SiO2提取转化，制备结构可控的多孔硅材料，基于材料特殊的理化性质和表面特性，实现CO2的高效捕集；(2)利用材料表面特有的硅羟基，以有机胺类化合物为改性剂，以嫁接法和浸渍法对材料表面进行修饰，提升CO2的吸附性能和选择性。测定多孔硅材料改性前后吸附-脱附CO2的基础数据，建立动力学关系；结合宏观吸附-脱附动力学数据，考察吸附可逆性对吸附-脱附等温线的影响，确定循环吸附参数；采用现代波谱及表面分析技术，研究吸附-脱附机制，明确固碳机理及规律，力求建立吸附性能与分子结构间的内在联系，为发展煤矸石基多孔硅材料为捕集CO2的高效吸附剂提供基础数据和理论依据。

Adsorption process is seen as an important development direction because it can be used to reclaim high purity CO2. However, a core issue is considered about how to develop high selective, high effective, low cost, and low desorption energy consumption adsorbing materials and low energy consumption in CO2 separation processes. For this issue, new ideas are put forward as follows: One is to perpare struction-controllable porous silicate material using coal gangue from Wujialiang coal preparation plant in Inner Mongolia, which were perared from the amorphous silicon oxide. Based on the special physicochemical properties and surface characteristics,the porous material can be used to high effectively capture CO2. Another is to modify the surface of porous material using amine-base odifier with grafting and impregnation methods, so the CO2 adsorption selectivity of porous material can be improved.The basic adsorption and desorption data before and after modification of porous silicate material will be determined and the dynamic relations will be also founded. From the macroscopical adsorption and desorption dynamic data, the effects from adsorption reversibility on adsorption and desorption isotherms are discussed, breakthrough curves for the CO2 adsorption are protracted, and the circular adsorption parameters are ascertained. Based on the modern spectral instruments and surface analysis techniques, the adsorption and desorption mechanism are discussed, the mechanism and law of CO2 fixation are definituded, and quantitative relation between the adsorption performance and molecular structure are tried to obtain. Furthermore, the basic data and theoretical basis are provided for the development of effective adsorbents for the CO2 capture using the porous silicate material. Compared with other sorbents, the coal gangue based porous silicate material shows strong adsorption performance, low preparation cost, and low desorption energy consumption for CO2 capture. In addition, the task the implementation will be very significant to develop the high-efficiency technology for CO2 capture from flue gases and the new functions of porous silicate material.