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A Fundamental Understanding of MgO-based CO<sub>2</sub> Sorbents
서정길 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
MgO is regarded as the most promising sorbent for intermediate temperature CO<sub>2</sub> capture due to its abundance in basic sites, high stability, and lower energy requirement for regeneration. However, the CO<sub>2</sub> sorption capacity of MgO is significantly hindered by its relatively slow kinetics and tendency to agglomerate after high-temperature regeneration. Recently, MgO-based sorbents promoted by alkali salts and binary or ternary eutectic mixtures have gained much attention for intermediate temperature CO<sub>2</sub> capture due to their improved CO<sub>2</sub> uptake and MgO conversion. However, the chemistry behind this promoting effect of eutectic mixture to MgO-based sorbents still remains unclear. In this work, we successfully carried out the direct observation of the sorption of gaseous CO<sub>2</sub> over molten EM-promoted solid MgO via in situ TEM. We report the feasibility of using commercially available hydrotalcites as stabilizing additives for NaNO<sub>3</sub>-promoted MgO sorbents.
서정길 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In this work, self-condensation reaction of 2-methylfuran and its cross-condensation reactions with furfural and its hydrogenation products (2-pentanone, n-butanal, gamma-Valeractone, angelica lactone, levulinic acid, and furan) have been implemented to produce high carbon (C14-C16) transport fuel precursors. Sulfonic acid catalysts with and without alkyl chain linkers and sulfonic acid functionalized ionic liquids supported on fibrous nano-silica (KCC-1) were synthesized and investigated for these reactions. The activity and selectivity of the synthesized catalysts with respect to acidic amount, acidic strength, hydrophobicity, and surface properties were investigated. Among the synthesized catalyst, sulfonic acid-functionalized KCC-1 based catalysts showed higher conversion and selectivity due to its easy accesible acidic active site with appropriate acid strengh and hydrophobicity. The catalysts were recyclable for more than four cycles.