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Deliana Dahnum,Huyen Tran Dang,Ngoc Tuan Tran,하정명,이현주 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
For thefirst time, three-dimensional Zeolitic Imidazole Framework (3D) ZIF-7 (Zn(BeIM)2, BeIM= benzimidazole) supported on two-dimensional (2D) Zn(BeIM)OAc (Zinc–Benzimidazole–Acetate) wassynthesized by reacting Zn(OAc)2 and benzimidazole in a one-pot reaction. By modulating the amount ofdiethylamine during the reaction, the ZIF-7/Zn(BeIM)OAc with a 1 to 1 molar ratio was obtained when thereactant molar ratio of Zn(OAc)2 and benzimidazole was 1 to 1.5. It was found that 3D-ZIF-7 wassynthesizedfirst and then transformed into 2D-Zn(BeIM)OAc by the reaction with remaining Zn(OAc)2. The synthesized ZIF-7 (Zn(BeIM)2) supported on Zn(BeIM)OAc (1/1) showed enhanced catalyticperformance in the methoxycarbonylation of aniline with dimethyl carbonate. The yield of methylN-phenyl carbamate reached 92.0% in 2 h at 190 C, which was higher than yields obtained using thesingle component catalysts ZIF-7 (69.9%) and Zn(BeIM)OAc (35.4%). Furthermore, this catalyst wassuccessfully reused four times, maintaining an MPC yield of 92.0%–95.8%.
Magnesium Oxide-catalyzed Oxidative Depolymerization of EFB Lignin
Vania Tanda Widyaya,Huyen Thanh Vo,Deliana Dahnum,이현주 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.4
Empty fruit bunch (EFB) lignin, which had been isolated by the previous sulfuric acid treatment of EFB, was oxidized in the presence of a base and air to depolymerize the solvent-insoluble lignin into smaller solvent-soluble molecules. Depending on the types of base and solvent, the yield of solvent-soluble lignin (SSL) varied, and the highest yield of 54% was obtained when MgO and ethanol were used at 150 °C with an air pressure of 500 psig for 3 h. Gel permeation chromatography analysis of the oxidized lignin showed that SSL had decreased molecular weight compared to native EFB lignin.31P NMR experiments revealed that concentrations of hydroxy group and acid group were increased by the oxidation. 2D 1H-13C HSQC NMR was performed, and it was found that the area intensities related to methoxy group and β-O-4′ unit as well as guaiacyl, oxidized syringyl, and p-hydroxybenzoate group were decreased by the oxidation.