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| 1 | Organic solvent-and phase transfer catalyst-free oxidation of cyclohexanol to cyclohexanone with dilute H_2O_2显示文摘The oxidation of cyclohexanol to cyclohexanone with 30% aqueous hydrogen peroxide by using peroxotung-state complexes formed in situ from sodium tungstate di-hydrate and various bidentate organic ligands as the catalysts, without organic solvents, halide and phase transfer catalyst has been carried out. The influence of 13 ligands on the oxidation is investigated. The maximum yield of cyclohexanone is obtained when using 1,10-phenanthroline (96%) and oxalic acid (95%) as the ligand. Very high yields (around 90%) have also been obtained for the instances of using salicylic acid, 3,5-dibromosalicylic acid, and 8-hydro- xylquino-line as ligands. A research to improve the reaction condition using cheap oxalic acid as the ligand indicates that the optimum condition is that the reaction mixture with a molar ratio of cycohexanol:tungstate dihydrate:oxalic acid: 30% H2O2=100:2:2:120 was stirred at 85-90℃ for 12 h. | WEI Junfa, SHI Xianying, HE Diping & ZHANG MinSchool of Chemistry and Material Science, Shaanxi Normal University, Xi’an 710062, China | 2002 | Chinese Science Bulletin2002，47，24： | 3 |
| 2 | Synergistic catalysis of cluster and atomic copper induced by copper-silica interface in transfer-hydrogenation显示文摘To data,using strong metal-support interaction(SMSI)effect to improve the catalytic performance of metal catalysts is an important strategy for heterogeneous catalysis,and this effect is basically achieved by using reducible metal oxides.However,the formation of SMSI between metal and inert-support has been so little coverage and remains challenge.In this work,the SMSI effect can be effectively extended to the inert support-metal catalysis system to fabricate a Cu^(0)/Cu-doped SiO_(2) catalyst with high dispersion and loading(38.5 wt.%)through the interfacial effect of inert silica.In the catalyst,subnanometric composite of Cu cluster and atomic copper(in the configuration of Cu-O-Si)can be consciously formed on the silica interface,and verified by extended X-ray absorption fine structure(EXAFS),in situ X-ray photoelectron spectroscopy(XPS),and high-angle annular dark field-scanning transmission electron microscopy(HAADF-STEM)characterization.The promoting activity in transfer-hydrogenation by the SMSI effect of Cu-silica interface and the synergistic active roles of cluster and atomic Cu have also been revealed from surface interface structure,catalytic activity,and density functional theory(DFT)theoretical calculation at an atomic level.The subnanometric composite of cluster and atomic copper species can be derived from a facile synthesis strategy of metal-inert support SMSI effect and the realistic active site of Cu-based catalyst can also been identified accurately,thus it will help to expand the application of subnanometric materials in industrial catalysis. | Ruoyu Fan Yange Zhang Zhi Hu Chun Chen Tongfei Shi Lirong Zheng Haimin Zhang Junfa Zhu Huijun Zhao Guozhong Wang | 2021 | Nano Research2021，14，12： | 3 |
| 3 | Application of a fractal method relating concentrations and distances for separation of geochemical anomalies from hackground显示文摘 | Changjiang Li Tuhua Ma Junfa Shi | 2005 | Journal of Exploration2005，77，： | 1 |
| 4 | Application of a fractal method relating concentrations and distances for separation of geochemical anomalies from background显示文摘 | Li Changjiang Ma Tuhua Shi Junfa | 2003 | Journal of Geochemical Exploration2003，77，23： | 1 |
| 5 | 显示文摘 | Shi Xianying Wei Junfa | 2008 | Journal of Molecular Catalsis A:Chemical2008，280，12： | 1 |
| 6 | Application of a fractal method relating concentrations and distances for separation of geochemical anomalies from background显示文摘 | LiChangjiang Ma Tuhua Shi Junfa | | 0，，2： | 1 |
| 7 | A Rapid and Simple Method for Quantitative Aziridination from Aminobrominated Derivatives of Olefins under Solvent-free and Mild Conditions显示文摘从石蜡的 aminohalogenation 导出的 1,2-vicinal haloamines 的催化脲的 aziridination 被开发了。这个快速、简单的方法被简单地在空中在房间温度磨底层, K2CO3 和脲的催化数量的稳固的混合执行。反应在包括的石蜡的 aminohalogenated 衍生物的一个大范围为 aziridines 的量的准备提供一个协议,不饱和的酉同类,,不饱和的酉旨和简单石蜡。包含支持 deprotonation 的 H 契约的可能的机制为这反应被建议了。 | Wei,Junfa Chen,Zhanguo Gao,Yanni Zhang,Peng Wang,Chuanning Zhao,Pengfei Wang,Yun Shi,Xianying | 2012 | Chinese Journal of Chemistry2012，30，2： | 0 |
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