Porous molecular sieve polymer composite with high CO2 adsorption efficiency and hydrophobicity

• Published in: Separation and purification technology 2023-02, Vol.307, p.122738, Article 122738
• Main Authors: Chi, Shudan, Ye, Yi, Zhao, Xinglei, Liu, Junteng, Jin, Junsu, Du, Le, Mi, Jianguo
• Format: Article
• Language: English
• Subjects: Bilayer composite structure; CO2 capture; High CO2 adsorption efficiency; Hydrophobicity; In-situ growth
• ISSN: 1383-5866
• DOI: 10.1016/j.seppur.2022.122738

•NaY@PA was prepared by in situ growth to solve the problem of powder blockage.•Many lattice defects and adsorption sites were formed in confined space.•CO2 adsorption efficiency and hydrophobicity of the composite were enhanced.•NaY-ZIF@PA exhibited excellent thermal-cycle stability and water tolerance. Greenhouse gases lead to frequent natural disasters, and CO2 emissions from flue gases account for nearly half of anthropogenic CO2 emissions. As an adsorbent, molecular sieves show excellent CO2 adsorption; however, their defects limit their industrial application. To solve the problem of powder blockage and H2O absorption, we proposed the in-situ growth of molecular sieve in polyacrylate matrix beads to obtain molecular sieve composite for CO2 capture in flue gas after combustion. Compared with those of pristine NaY, the CO2 adsorption capacity of NaY@PA composite increased by 17.9 % and the H2O adsorption capacity decreased by 36.6 %. For further reduction in H2O absorption, post-modified composite NaY-ZIF@PA was synthesized by loading ZIF on NaY@PA surface to form a bilayer composite structure. The H2O absorption of NaY-ZIF@PA was reduced by 54.8 %, thus ensuring highly efficient CO2 adsorption.