4.8 Article

Developing hybrid 1-hexyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide/titanium dioxide/water absorbent for CO2 separation

期刊

APPLIED ENERGY
卷 326, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2022.119972

关键词

CO2 separation; Ionic liquid; Titanium dioxide; Absorption ability

资金

  1. National Natural Science Foundation of China [22108115, 21838004, 21908093]
  2. National Basic Research Program of China (973 Program) [2013CB733500]
  3. Joint Research Fund for Overseas Chinese Scholars and Scholars in Hong Kong and Macao Young Scholars [21729601]
  4. China Postdoctoral Science Foundation [2021M691554]
  5. Kempe foundation in Sweden [SMK21-0020]
  6. Swedish Energy Agency [P50830-1]

向作者/读者索取更多资源

The development of a novel absorbent for CO2 separation technology was investigated in this study. The experimental results showed that the developed technology had a significantly higher CO2 mass-transfer rate and lower cost compared to current commercialized technology. The absorption ability index successfully predicted the performance of CO2 separation technologies.
The development of novel absorbents is essential for improving CO2 separation technology. In this study, 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide/water ([Hmim][NTf2]/TiO2- H2O) was developed to separate CO2, where the thermodynamic and kinetic experiments were conducted, and Henry's constant and the liquid-side mass-transfer coefficient were determined accordingly. Furthermore, CO2 separation performance in a bubble tower was validated. A previously proposed index named absorption ability (AA) was used to predict and compare the experimental results. Additionally, the cost of biogas upgrading (i.e., CO2 removal for biogas purification) using [Hmim][NTf2]/TiO2-H2O was estimated. The results showed that for the developed [Hmim][NTf2]/TiO2-based technology, the average CO2 mass-transfer rate was increased by 20.0% compared with the current commercialized technology, and the contributions from the thermodynamic and kinetic aspects were 2.5% and 17.5%, respectively. The cost of biogas upgrading was 16.6% lower. In addition, AA successfully predicted the performance of CO2 separation technologies, achieving an average relative deviation of 8.1%.

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