Highly efficient and stable PEI@Al2O3 adsorbents derived from coal fly ash for biogas upgrading

作者：Chunyan Li, Feng Yan, Xuehua Shen, Fan Qu, Yingqing Wang, Zuotai Zhang · 年份：2021 · DOI：10.1016/j.cej.2020.128117 · 被引用次数：48 · 研究领域：Materials Science

Abstract Cyclic CO2 adsorption via amine-functional adsorbents is widely accepted as an efficient route for biogas upgrading and CO2 mitigation. However, the fast deactivation and insufficient CO2 uptake are the major drawbacks of this technology. Herein, we developed a green and facile approach, including the recycling of porous nano-Al2O3 support from coal fly ash (CFA) and the impregnation of PEI onto the nano-Al2O3 support with large pore volume, to enhance both the CO2 adsorption capacity and the cyclic stability of amine-functional adsorbents. The as-synthesized 50%PEI@Al2O3 adsorbent possessed a CO2 adsorption capacity of 136 mg gadsorbent-1 and showed superior cyclic stability with merely a negligible decay of