碱金属硝酸盐强化类水滑石基CO2吸附剂的机理研究

Layered double hydroxides (LDH) are keys to the sorption enhanced water gas shift processes, which can not only increase the conversion of H2, but also capture the CO2. In view of the stability of LDH-based CO2 adsorbent is till poor, the alkali metal nitrate enhancement is lack of systematic study, and the mechanism of alkali metal nitrates enhancing on LDHs for CO2 capture also lacks in theoretical guidance. The objective of this project is to prepare the LDH hybrids by using supported materials such as iron, aluminum, etc.to solve the problem of poor stability, and improving their CO2 capture capacities by series of alkali metal nitrate modified. The effect of physicochemical property of alkali metal nitrates on CO2 capture performance of LDH hybrids will also be investigated. The mechanism of action of the surface alkali site of the LDH hybrid with CO2 and the enhancing mechanism of alkali metal nitrates on LDHs for CO2 capture will be revealed as well. Finally, the CO2 adsorption-desorption kinetics and mechanism will be studied, as well as the operating conditions of the adsorbent in SEWGS process will be optimized. The goal of this project is to establish a highly efficient and stable CO2 adsorbent, which will be suitable for practical applications. The research results will provide the theoretical basis and support for CO2 adsorbents development and application.

类水滑石（LDH）基CO2吸附剂在吸附促进型水-气转化反应（SEWGS）中具有重要应用，不但可以提高H2的转化率，还可以捕集CO2。针对目前LDH基CO2吸附剂稳定性差，碱金属硝酸盐强化效果缺少系统研究，碱金属硝酸盐强化机理缺少理论指导等问题。本项目拟以铁、铝等物质作为支撑材料制备LDH复合材料来解决稳定性差问题，利用系列碱金属硝酸盐的强化作用来提高LDH复合材料CO2吸附性能。通过系统研究碱金属硝酸盐理化特性对LDH复合材料CO2吸附性能的影响规律，揭示LDH复合材料表面碱位与CO2的作用机理，阐明碱金属硝酸盐促进LDH复合材料吸附CO2的机理。通过探究LDH复合材料的吸-脱附机制，优化材料在SEWGS反应中的运行参数。最终构建出更适合实际工况下应用的高效、稳定的CO2吸附材料。项目成果将为CO2吸附材料的开发和应用提供理论依据和支持。

类水滑石（LDH）基CO2吸附剂在吸附促进型水-气转化反应（SEWGS）中具有重要应用，不但可以提高H2的转化率，还可以捕集CO2。本课题针对目前LDH基CO2吸附剂稳定性差，碱金属硝酸盐强化效果缺少系统研究，碱金属硝酸盐强化机理缺少理论指导等问题开展研究。本项目以氧化石墨烯作为支撑材料制备LDH复合材料来解决其稳定性差的问题。利用系列碱金属硝酸盐来强化LDH复合材料CO2吸附性能，通过测试碱金属硝酸盐种类，负载量等对LDH复合材料CO2吸附效果的影响，解析了碱金属硝酸盐对复合材料CO2吸附性能的影响规律，确定了材料的最佳制备条件，构建出了高效、稳定的CO2吸附材料。通过测定吸附条件对LDH复合材料CO2吸附性能的影响，优化了碱金属硝酸盐强化后LDH复合材料在吸附促进型水-气转换反应中的运行参数。通过利用先进的表征手段揭示了碱金属硝酸盐强化LDH基材料CO2吸附性能的机制。项目成果将为CO2吸附材料的开发和应用提供理论依据和支持。