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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.
서정길,Min Hye Youn,정진석,송인규 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.5
Mesoporous nickel–alumina (Ni–A-NS) catalysts prepared by a non-ionic surfactant-templatingmethod were calcined at various temperatures for use in hydrogen production by steam reforming of liquefied natural gas (LNG). The effect of calcination temperature of nickel–alumina catalysts on their physicochemical properties and catalytic activity for steam reforming of LNG was investigated. Nickel oxide species were finely dispersed on the surface of Ni–A-NS catalysts through the formation of nickel aluminate phase. Reducibility, nickel surface area, and nickel dispersion of Ni–A-NS catalysts decreased with increasing calcination temperature. In the steam reforming of LNG, both LNG conversion and hydrogen composition in dry gas decreased with increasing calcination temperature of Ni–A-NS catalysts. Nickel surface area and reducibility of Ni–A-NS catalysts were well correlated with catalytic performance of the catalysts. Among the catalysts tested, Ni–A-NS700 (nickel–alumina catalyst calcined at 700 8C) with the highest nickel surface area and the highest reducibility exhibited the best catalytic performance. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.