Washcoated zeolite structured adsorbents for CO2 capture and recovery by rotary adsorption

作者：Ziyi Li, Cong Wang, Jin Xiao, Jiang Xu, Ningqi Sun, Xiong Yang, Yingshu Liu · 发表于：Carbon Capture Science & Technology · 年份：2025 · DOI：10.1016/j.ccst.2025.100378 · 被引用次数：5 · 研究领域：Carbon Dioxide Capture Technologies、Phase Equilibria and Thermodynamics、Membrane Separation and Gas Transport

Adsorption has long been recognized as a vital and extensively utilized technology for CO2 capture, for which developing a cost-effective process is a long-sought goal. The structured adsorbent with faster heat and mass transfer, present new opportunities for advancing rotary adsorption process, however, lacks comprehensive evaluation and discussion on CO 2 sorption. In this study, structured adsorbents were prepared by washcoating commercial NaY and 13X zeolites onto a fiberglass honeycomb support. A series of characterizations and breakthrough test demonstrated the advantages of structured adsorbents over conventional pellets. NaY zeolite emerged as the thermodynamically and kinetically preferred CO 2 adsorbent, exhibiting an equilibrium adsorption capacity of 5.972 mmol·g -1 and an internal mass transfer coefficient of 5.12 × 10 –3 s -1 (15 % CO 2 , 298 K, 1 bar). These values are 18.3 % and 164 % higher than those of its pellet counterpart and 12.3 % and 36.9 % higher than those of the 13X honeycomb. NaY's great adaptability across various applications was indicated by its breakthrough capacities at different temperatures and CO 2 feed concentrations, as well as the minimal influence of feed gas flow rate on CO 2 adsorption equilibrium and kinetics. By employing a recirculating thermal desorption strategy, CO 2 can be enriched from 5 % to 61 %, 15 % to 79 %, and 55 % to 92 %, achieving a 90 % recovery under mild desorption conditions. A two-stage rotary adsorption process...