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Reversible absorption of SO2 with alkyl-anilines: The effects of alkyl group on aniline and water
Huyen Thanh Vo,조신혜,이웅,제정호,김홍곤,이현주 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
SO2 absorption behaviours of N,N-dimethylaniline (DMA), N,N-diethylaniline (DEA), N,N-dibutylaniline (DBA), and N-methyldiphenylamine (MDPA) — were investigated in dry and wet conditions. DMA showed the highest SO2 absorption capacity of 1.5 molSO2 molAbsorbent−1 in dry condition, while DBA showed the highest capacity of 1.75 molSO2 molAbsorbent−1 in wet condition. Raman analyses revealed that anilines captured SO2 by forming charge transfer complexes in dry condition and the interaction between SO2 and aniline decreased as the steric hindrance of alkyl aniline increased. In contrast, bisulfite-based acid-base salt was formed in the presence of water, and the capacity increased with an increasing basicity of the alkyl aniline.
Effect of pore texture property of mesoporous alumina on adsorption performance of ammonia gas
Huyen Thanh Vo,Jiyull Kim,Na Yeon Kim,Jung-Kul Lee,Ji Bong Joo 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.91 No.-
We report that the adsorption of ammonia gas on the synthesized mesoporous alumina (MA) with thecontrolled pore texture properties were measured. The MA adsorbents with controlled pore propertieswere synthesized by the Evaporation Induced Self Assembly (EISA) method. It was found that the poresize, and surface area could be adjusted by changing the mole ratio of the acid to alumina precursorduring the preparation procedure. When the MA materials were used as adsorbents on ammonia gasadsorption, both adsorption kinetics and capacity were highly influenced by the pore texture properties. Pseudofirst order that adsorption kinetic constant and the effective diffusivities of alumina adsorbentsdecreased with decreasing pore size or increasing surface area, while adsorption capacities increased. Inorder to estimate the adsorption behavior of ammonia gas, the Langmuir, Freundlich, Sips, and Tothisotherm models were employed. Langmuir model-based calculation reveals that mesoporous aluminaMA-1.1 adsorbent with a large surface area and a small pore size shows the best performance in terms ofthe calculated maximum adsorption capacity of ammonia (193.57 mg/g), which is almost double that ofother MA adsorbents (MA-3.3, MA-4.4) and 2.89 times that of commercial g-Al2O3.
Ionic Liquid-assisted Separation of Carbohydrates from Lignocellulosic Biomass
Huyen Thanh Vo,김창수,Sang Deuk Lee,이현주 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.8
To utilize carbohydrates in lignocellulosic biomass, a fractionation of lignocellulose is crucial. In this study, poplar wood sawdust was treated with a mixture of ionic liquids, 1-butyl-3-methylimidazolium acetate ([Bmim][OAc]) and 1,3-dimethylimidazolium methyl phosphite ([Dmim][MeO(H)PO2]), to separate carbohydrate and lignin components from wood. Three types of product were isolated: water-soluble wood (WSW), water-insoluble wood (WIW), and wood in ionic liquids (WIL). At a dissolution temperature of 130°C for 18 h, WSW was found to have high carbohydrate and low lignin contents of 81.0 and 3.5%, respectively, corresponding to a delignification efficiency of 88.9%. WIW isolated under the same condition was found to have 55% of the lignin of native poplar. However, with an increase in the dissolution temperature and the time, the yield of WIL increased due to the increased phosphorylation in both carbohydrate and lignin, forming a mixture of carbohydrate and lignin having phosphorylated ionic functional groups.
Hydrolysis of cellulose to glucose using sulfonated active carbon
( Vo Thanh Huyen ),이현주 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Cellulose conversion to glucose is one of the crucial processes in the transformation of biomass to biofuels and other platform chemicals. In this research, we introduced the synthesis and hydrolysis of a cellulose derivative in an assistance of ionic liquid to glucose. A new type of water soluble cellulose, ionic cellulose (IC), was synthesized by the reaction of ionic liquid and cellulose. Due to its good solubility in water, this cellulose derivative was expected to give a good performance in hydrolysis. The hydrolysis of IC was conducted in the presence of several kinds of acid catalyst. Among the tested catalysts, sulfonated active carbon showed the highest yield of glucose with 43% and 54% at 150℃ and 180℃, respectively. This catalyst also maintained its catalytic activity after several time reuses.
Preparation of Mesoporous Alumina for Removing Ammonium Nitrogen in Aqueous Solution
( Huyen Thanh Vo ),김민기,주지봉 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The study on removal of ammonium nitrogen (NH<sub>4</sub>-N), a toxic element damaged to living bodies in water, has received great attention in recent years. In this study, we synthesized Ordered Mesoporous Alumina (OMAs) with different pore structures by Evaporation Induced Self Assembly (EISA) method and investigated adsorption performances for removal of ammonium ions in aqueous solution. The physical properties of OMAs were controlled by adjusting acid concentrations and heat treatment conditions. Furthermore, OMAs were functionalized by using chemicals containing phosphoric, sulfuric, and carboxylic acid groups to tune the acidity. In the adsorption experiments, the effects of adsorbent amount, ammonium concentration, reaction temperature and time were optimized. The prepared OMAs showed high surface area with uniform pore diameter and the enhanced physical/chemical properties for the removal of ammonium nitrogen from aqueous solution as compared to the commercial alumina oxides.
Ring-Opening Metathesis Polymerization and Hydrogenation of Ethyl-substituted Tetracyclododecene
권오준,Huyen Thanh Vo,이슬비,김태경,김훈식,이현주 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
Ring-opening metathesis polymerization (ROMP) of an ethyl-substituted tetracyclododecene (8-ethyltetracyclo[4.4.0.1^(2,5).1^(7,10)] dodec-3-ene, Et-TCD) was carried out in the presence of a ternary catalyst system consisting of WCl_6, triisobutyl aluminium (iso-Bu_3Al), and ethanol. The optimal molar ratio of Et-TCD/WCl_3/iso-Bu3Al/ethanol was found as 500/1/3/2 at which the yield of ring-opened polymer was 100%. 1-Hexene was shown to be an effective molecular weight controlling agent for ROMP reaction of Et-TCD. The hydrogenation of the ring opened polymer (p-Et-TCD) was conducted successfully using Pd(5 wt %)/γ-Al_2O_3 at 80 ^oC for 1 h. Chemical structures of p-Et-TCD and its hydrogenated product(H_2-p-Et-TCD) were characterized using 2D NMR techniques (^1H-^1H COSY and ^1H-^13C HSQC). The changes of physical properties such as thermal stability, glass transition temperature and light transmittance after the hydrogenation were also investigated using TGA, DSC, and UV.