Facile and efficient one-pot synthesis of 2-arylbenzoxazoles using hydrogen tetrachloroaurate as catalyst under oxygen atmosphere     

Yun-kui Liu  Da-jie Mao  Shao-jie Lou  Jian-qiang Qian  Zhen-yuan Xu 《Journal of Zhejiang University. Science. B》2009,10(6):472-478

In this paper, we presented a novel method for the facile and efficient one-pot synthesis of 2-arylbenzoxazoles, which oxygen atmosphere with anhydrous tetrahydrofuran (THF) as solvent or in solvent-free condition. The results show that this method could bring excellent yields as high as 96%. THF was proven to be the best choice among several solvents screened and the reaction was tolerated with a variety of aromatic aldehydes possessing electron-donating or withdrawing groups. The advantages of the present method lie in catalytic process using economic and environmentally benign dioxygen as oxidant.  相似文献   

CuO对H_2O_2的催化作用探讨   总被引：1，自引：0，他引：1  

周勇  余丽琼  文丰玉  鲍正荣 《内江师范学院学报》2004,(6)

探讨了CuO催化H2O2分解的反应机理及主要因素。  相似文献   

甲基纤维素修饰电极对H2O2电催化还原的研究     

李业梅  戴月 《郧阳师范高等专科学校学报》2004,24(6):18-20

用甲基纤维素(MC)将过氧化氢酶(Cat)固载于热裂解石墨电极表面,制备了Cat-MC膜修饰电极.甲基纤维素膜中的过氧化氢酶与电极直接传递电子.在pH6.0的磷酸盐缓冲溶液中可得到一对可逆的过氧化氢酶辅基血红素Fe(III)/Fe(II)电对氧化还原峰,式电势为-0.331V(vsSCE).其式电势随溶液的pH值增加而负移且成线性关系,直线斜率为-38.0mV/pH,说明过氧化氢酶的电子传递过程伴随有质子的转移.并研究了过氧化氢酶修饰电极对H2O2的电催化性能.在H2O2一定浓度范围(15.6～110.1μmol/L)内,催化电流与H2O2浓度成线性关系.  相似文献   

过碳酰胺的开发、生产及应用     

王万林  史建公 《河北北方学院学报(社会科学版)》2001,(3)

综述了过碳酰胺的性质,国内外生产现状,制备方法及用途.  相似文献   

Hydrogenation properties of mechanically milled Mg2Nio.8Cr0.2-CoO/Al2O3 composites     

WANG Xiu-li  TU Jiang-ping  CHEN Chang-pin  ZHANG Xiao-bin  ZHAO Xin-bing 《Journal of Zhejiang University. Science. B》2005,(3)

Mg2Ni0.8Cr0.2-x wt.% CoO/Al2O3 (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg2Ni0.8Cr0.2 alloy and CoO/Al2O3 compound for 45 h. The addition of CoO/Al2O3 compound resulted in the good kinetics properties of hydriding/dehydriding reaction of the composites. The composite with 1.0 wt.% CoO/Al2O3 catalyst could reach the maximum hydrogen absorption capacity (2.9 wt.%) within 5 min at 393 K under H2 pressure of 4 MPa, and can desorb rapidly at 493 K. The decomposition and synthesis of hydrogen molecule on Mg2Ni0.8Cr0.2 alloy surface was promoted by addition of CoO/Al2O3 catalyst. In addition, the formation of metallic Ni particles, strain and defects during the ball milling process also resulted in the improved hydrogenation performance of Mg2Ni-based alloys.  相似文献   

Degradation of chlorophenol by in-situ electrochemically generated oxidant     

丛燕青  吴祖成  叶倩  谭天恩 《Journal of Zhejiang University. Science. B》2004,(2)

INTRODUCTION With the development of industry, more and more pollutants are discharged into environment, among them, phenolic wastes are typical contami-nants considered to be hazardous and top priority toxic pollutants listed by the USEPA. They are toxic even at low concentration. Due to their biorefractory, bioaccumulation and carcinogenic potential, the treatment of these contaminants is very important in environmental protection. Various technologies and processes have been tried …  相似文献   

过碳酸钠的开发、生产及应用     

王万林  史建公  韩春国 《河北北方学院学报(社会科学版)》1997,(5)

介绍了新型精细化工产品过碳酸钠的性质、国内外生产现状、生产技术进展和应用情况.  相似文献   

H2S is synthesized via CBS/CSE pathway and triggered by cold conditions during Agaricus bisporus storage     

《Electronic Journal of Biotechnology》2021

  相似文献   

镁基储氢合金材料的性能及研究进展     

吴睿  陈用娇  周礼玮  韦小凤 《大众科技》2016,(7):49-52

由于资源丰富,储氢容量较高,价格低廉,应用前景广阔等特点,镁基储氢合金材料成为近年来研究的热点,然而其稳定的热力学性和缓慢的动力学性限制了它的应用,因而对镁基储氢合金材料的改性日益成为了镁基储氢合金发展的重要方向,文章对镁基储氢合金材料的性能及改性方法进行了综述,并对其发展趋势进行了展望。  相似文献   

Decolorization Kinetics of Sludge Protein Solution by ~（60）Coγ-Ray Irradiation/H_2O_2 Oxidation     

相玉琳  张卫江  郑浩 《天津大学学报(英文版)》2011,17(1):45-50

In order to carry out decolorization, sludge protein solution, a dark brown close to black solution from activated sludge, was subjected to ⁶⁰Co γ-ray irradiation in the presence of hydrogen peroxide. UV/Vis spectrophotometric method was used to investigate the effect of H2O2 on the coloration apparent kinetics and rate constants of sludge protein solution under γ-ray irradiation. In addition, the effects of irradiation dose, initial sludge protein solution concentration, and pH value on the decolorization efficiency of sludge protein solution were studied. Results showed that the decolorization apparent kinetics of sludge protein solution was a first-order reaction. The solution decolorization percentage increased with the increase of irradiation dose or the decrease of initial sludge protein solution concentration. The examination results of pH value showed that the sludge protein solution could be more efficiently decolorized in alkaline media than in acid media. Moreover, sensory evaluation and foamability analysis indicated that irradiated samples under H2O2 oxidation showed better sensory score and foamability.  相似文献