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Hydrate-Based CO2 Capture from Integrated Gasification Combined Cycle Syngas with Tetra-n-butylammonium Bromide and Nano-Al2O3

Li, Ze-Yu, Xia, Zhi-Ming, Li, Xiao-Sen, Chen, Zhao-Yang, Cai, Jing, Li, Gang, Lv, Tao
Energy & fuels 2018 v.32 no.2 pp. 2064-2072
additives, bromides, carbon dioxide, clean energy, fuels, gasification, hydrogen, quaternary ammonium compounds, synergism, synthesis gas, tetrahydrofuran
Hydrate-based CO₂ capture and/or H₂ purification from integrated gasification combined cycle (IGCC) syngas has been a more and more attractive technology in both environmental and clean energy fields. This work focused on both microcosmic and macroscopic studies for the CO₂/H₂ hydrate formation process with synergic additives comprised of tetra-n-butylammonium bromide (TBAB) and nano-Al₂O₃. The experiments were carried out with 0.5 wt % nano-Al₂O₃ and 1, 5, 10, and 11 wt % TBAB. The microcosmic study shows that, with the synergic additives, the CO₂/H₂ mixture hydrate formed mainly on the nano-Al₂O₃ surface and formed a semiclathrate structure. Additionally, the macroscopic study shows that the synergic additives could remarkably promote the gas uptake and separation efficiency. Noteworthy, in comparison to unitary TBAB, tetrahydrofuran, and cyclopentane, the synergic additives could increase the gas uptake for the CO₂/H₂ hydrate formation process by approximately 43.62, 230.56, and 173.27%, respectively. The experimental results indicate that the synergic effect of TBAB and nano-Al₂O₃ is helpful for hydrate-based CO₂ capture from IGCC syngas.