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3. Research on multiphase synthesis of 1,5-di(o-anisidino) anthraquinone

Author

YU Liqiu, He Liang, Zhang Shu-fen, and Yang Jin-zong

Subjects
Solvent, Reaction mechanism, chemistry.chemical_compound, Chemistry, Potassium, Yield (chemistry), Inorganic chemistry, Xylene, Proton NMR, chemistry.chemical_element, General Chemistry, Anthraquinone, Catalysis
Abstract

According to the Ullman reaction mechanism, the synthesis of 1,5-di(o-anisidino)anthraquinone was achieved by the multiphase reaction of 1,5-dichloroanthraquinone in xylene and o-anisidine in the presence of copper metal powder and potassium acetate. The effects of various factors on the reaction, such as the dosages of xylene and catalyst, molar ratios of raw materials, and reaction times were investigated. When the molar ratio of 1,5-dichloroanthraquinone to o-anisidine and potassium acetate is 1:10:2.5 and the catalyst dosage based on 1,5-dichloroanthraquinone is 5.3%, the conversion of 1,5-dichloroanthraquinone is 97.8% and the yield of 1,5-di(o-anisidino)anthraquinone is 80.6% after reflux for 10 h. Under these conditions, the recovery of the solvent is 86.0%. The target compound was identified by MS, 1H NMR, IR and DSC.

Published
2008
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4. Direct peroxide–peroxide fuel cell – Part 1: The anode and cathode catalyst of carbon fiber cloth supported dendritic Pd

Author

Yang, Fan, Cheng, Kui, Mo, Yinghua, Yu, Liqiu, Yin, Jingling, Wang, Guiling, and Cao, Dianxue

Subjects
*PEROXIDES, *FUEL cell electrodes, *CATHODES, *CARBON fibers, *DENDRIMERS, *PALLADIUM catalysts, *ELECTROFORMING, *SCANNING electron microscopy
Abstract

Abstract: Dendritic Pd is electrodeposited uniformly on carbon fiber cloth via a potential pulse technique. The electrode is characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffractometer, and it shows a unique open structure allowing the full utilization of Pd surface active sites. H2O2 electrooxidation in KOH solution and electroreduction in H2SO4 solution on the dendritic Pd electrode are studied by linear sweep voltammetry and chronoamperometry. The electrode exhibits a high catalytic performance for both H2O2 electrooxidation and electroreduction, and it outperforms the conventional electrode made with commercial Pd/C powder. KOH and H2SO4 in excess show no improvement to the activity of H2O2 oxidation and reduction, respectively. The overpotential at the same current density for H2O2 electrooxidation in alkaline solution is significantly lower than that for electroreduction in acid medium on the dendritic Pd electrode. [Copyright &y& Elsevier]

Published
2012
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