YU Shunan;MA Kui;ZHOU Chang'an;SONG Lei;YUE Hairong;

• 1:School of Chemical Engineering
• 2:Sichuan University
• 3:Institute of New Energy and Low-Carbon Technology
• 4:Sichuan University

Abstract：

Capturing CO_2 by adsorption method is an important technology to realize the separation and removal of CO_2 from industrial exhaust gas. Solid amine adsorbents have been widely explored due to its excellent adsorption capacity and selectivity of CO_2, and low energy consumption for desorption. In fact, traditional powder adsorbents can only be used after molding in actual industrial processes due to its large pressure drop and other problems. However, monolithic adsorbents still face challenges such as insufficient adsorption capacity and poor mechanical properties. Herein, using macroporous epoxy resin polymer as template and tetraethyl orthosilicate as silicon source, the monolithic macroporous SiO_2 was prepared by sacrificial template method. On this basis, the monolithic macroporous SiO_2-based solid amine adsorbent was obtained by impregnating different amount of tetraethylene pentaamine(TEPA). The monolithic macroporous SiO_2 material takes the cross-linked hollow SiO_2 microspheres as the skeleton, which has a typical macroporous structure, and TEPA is evenly distributed on the surface of the skeleton. Under 75 ℃ and 0.1 MPa(12% CO_2/88% N_2), the CO_2 adsorption capacity of 70 T-MS sample with 70% TEPA loading is up to 191 mg/g, which can be stably maintained above 160 mg/g even after 50 adsorption-desorption cycles. Dynamic adsorption results show that the CO_2 adsorption kinetics follow the Avrami model, indicating that the adsorption process is less affected by mass transfer diffusion limitations. Furthermore, the mechanical strength of the adsorbents can reach 0.72 MPa(axial) and 30.30 N/cm(radial), meeting the requirements of industrial adsorbents. Moreover, the adsorbents also exhibit excellent thermal stability and low heat capacity(2.79 J/(g·℃)), which is expected to achieve low-energy desorption and regeneration.

Key Words： CO_2 capture;solid amine;monolithic adsorbents;macroporous SiO_2;mechanical strength

Abstract:

Keywords:

Foundation: 国家自然科学基金资助项目(22008160,22078208);; 内蒙古自治区科技重大专项资助项目(2020ZD0025);; 中国石油化工集团公司技术开发资助项目(420011)

Authors: YU Shunan;MA Kui;ZHOU Chang'an;SONG Lei;YUE Hairong;

DOI: 10.13226/j.issn.1006-6772.CN22050501

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