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Ultra-stable Cu-based catalyst for dimethyl oxalate hydrogenation to ethylene glycol

Chinese Journal of Chemical Engineering 2023年第8期60卷 186-193页

作者： Peipei Ai Huiqing Jin Jie Li Xiaodong Wang Wei Huang State Key Laboratory of Clean and Efficient Coal Utilization College of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China

Dimethyl oxalate(DMO) hydrogenation is a crucial step in the coal to ethylene glycol(CTEG) ***, Cu catalyst supported on fibrous mesoporous silica(Cu/FMS) was synthesized via liquid phase deposition technique and applied for the DMO hydrogenation to EG. The catalyst exhibited a remarkable EG selectivity of 96.95% and maintained its activity without deactivation for 1000 h. Fibers of FMS support and liquid phase deposition technology cooperated to give high dispersion of Cu species in the Cu/FMS catalyst, resulting in a high Cu surface area. The formation of Si—O—Cu during catalyst preparation process increased the Cu^(+)/(Cu^(0)+ Cu^(+)) ratio and enhanced the thermal and valence stability of Cu *** high Cu^(+) surface area and Cu stability(thermal and valence stability) of the Cu/FMS catalyst were key factors for achieving superior EG selectivity and ultra-high stability.

关键词： Stability Cu^(+)surface area fibrous mesoporous silica Catalyst Hydrogenation

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Magnetic Solid-Phase Extraction of Phthalate Esters from Environmental Water Samples using fibrous Phenyl-functionalized Fe3O4@SiO2@KCC-1

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Chinese Journal of Chemical Physics 2020年第6期33卷 749-756,I0003页

作者： Xue-zheng Zhou Xiang-yang Yan Ling Zhu Ming Ma Ya Dai Chang-guo Wang Li-jun Zhu Ke-jie Yu Shao-min Liu Chongqing Key Laboratory of Scientic Utilization of Tobacco Resources Chongqing 400060China Department of Chemistry University of Science and Technology of ChinaHefei 230026China

A new kind of phenyl-functionalized magnetic fibrous mesoporous silica(Fe3 O4@Si O2@KCC-1-phenyl) was prepared by copolymerization as an efficient adsorbent for the magnetic extraction of phthalate esters from environmental water samples. The obtained Fe3 O4@Si O2@KCC-1-phenyl showed monodisperse fibrous spherical morphology, fairly strong magnetic response(29 emu/g), and an abundant π-electron system, which allowed rapid isolation of the Fe3 O4@Si O2@KCC-1-phenyl from solutions upon applying an appropriate magnetic field. Several variables that affect the extraction efficiency of the analytes,including the type of the elution solvent, amount of adsorbent, extraction time and reusability, were investigated and optimized. Under optimum conditions, the Fe3 O4@Si O2@KCC-1-phenyl was used for the extraction of four phthalate esters from environmental water samples followed by high-performance liquid chromatographic analysis. Validation experiments indicated that the developed method presented good linearity(0.1-20 ng/m L), low limit of detection(7.5-29 μg/L, S/N =3). The proposed method was applied to the determination of phthalate esters in different real water samples, with relative recoveries of 93%-103.4%and relative standard deviation of 0.8%-8.3%.

关键词： fibrous mesoporous silica Phenyl-functionalized Magnetic solid-phase ex-traction High performance liquid chromatography Phthalate esters Environmental water

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