期刊
CHEMICAL ENGINEERING JOURNAL
卷 437, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135139
关键词
CO2 capture; Air revitalization; Amine-grafted SBA-15 silica; Zeolite-5A; CO2 adsorption kinetics; Cyclic adsorptiondesorption stability
资金
- Florida Atlantic University
This study investigated the performance of two adsorbent materials, commercially available zeolite-5A and an amine-grafted SBA-15 silica, for air revitalization in enclosed environments. The results show that the amine-grafted silica exhibited faster CO2 adsorption kinetics, lower activation and regeneration temperatures, and shorter activation and regeneration durations compared to zeolite-5A. It also demonstrated stable performance over multiple cycles.
This study investigated the performance of two adsorbent materials, namely commercially available zeolite-5A and an amine-grafted SBA-15 silica ( aminosilica ) synthesized in lab, for air revitalization in enclosed environments. Adsorbent performance metrics were evaluated, in the presence of 1 vol% CO2 in N-2 at 25 degrees C, in terms of equilibrium CO2 uptake, CO2 adsorption kinetics, activation temperature and duration, regeneration temperature and duration, and cyclic stability. Aminosilica and zeolite-5A achieved similar performance in terms of equilibrium CO2 uptake (5.7 wt%) and cyclic stability (less than 2% CO2 uptake loss over 20 cycles). The main differences were that the aminosilica demonstrated (i) 43% faster CO2 adsorption kinetics in the first five minutes of adsorption cycle, (ii) lower activation temperature (80 versus 180 degrees C), (iii) lower regeneration temperature (90 versus 200 degrees C), (iv) 50% shorter activation duration, and (v) 35% shorter regeneration duration. The aminosilica also showed stable performance when regenerated in the presence of air at elevated temperature (8.6% CO2 uptake loss over 100 cycles). These indicators make the aminosilica material a potentially viable adsorbent for CO2 removal from dilute streams, including air revitalization applications.
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