Salicylhydroxamic acid（SHA） was covalently grafted onto chloromethylated crosslinked polystyrene spheres（CMCPS） by the Friedel-Crafts alkylation reaction. The amount of SHA on CPS was found to be mainly dependent ...Salicylhydroxamic acid（SHA） was covalently grafted onto chloromethylated crosslinked polystyrene spheres（CMCPS） by the Friedel-Crafts alkylation reaction. The amount of SHA on CPS was found to be mainly dependent on the amount of Lewis acid（SnCl4） used and the reaction temperature. Under optimized conditions, the amount of SHA attached to CPS could reach up to 0.43 g/g CPS. Transition metal ions[Co（II）, Cu（II）, Fe（III） or Mn（II）] were then introduced into the resulting SHA-functionalized microspheres（SHA/CPS） through SHA-metal ion chelation. The obtained microspheres MSHA/CPS were explored as biomimetic catalysts for the aerobic oxidation of ethylbenzene（EB） to ethylbenzene hydroperoxide（EBHP）. Among the four supported metal catalysts, FeSHA/CPS showed the highest catalytic activity and good reusability, indicating its great potential as an effective heterogeneous catalyst for the aerobic oxidation of hydrocarbons under mild conditions.展开更多
基金Supported by the National Young Scientists Fund of China（No.21307116）, the Natural Science Foundation of Shanxi Province, China（No.2014011017-5）, the Project for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi Province, China（No.201504） and the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province, China（No.20140828）.
文摘Salicylhydroxamic acid（SHA） was covalently grafted onto chloromethylated crosslinked polystyrene spheres（CMCPS） by the Friedel-Crafts alkylation reaction. The amount of SHA on CPS was found to be mainly dependent on the amount of Lewis acid（SnCl4） used and the reaction temperature. Under optimized conditions, the amount of SHA attached to CPS could reach up to 0.43 g/g CPS. Transition metal ions[Co（II）, Cu（II）, Fe（III） or Mn（II）] were then introduced into the resulting SHA-functionalized microspheres（SHA/CPS） through SHA-metal ion chelation. The obtained microspheres MSHA/CPS were explored as biomimetic catalysts for the aerobic oxidation of ethylbenzene（EB） to ethylbenzene hydroperoxide（EBHP）. Among the four supported metal catalysts, FeSHA/CPS showed the highest catalytic activity and good reusability, indicating its great potential as an effective heterogeneous catalyst for the aerobic oxidation of hydrocarbons under mild conditions.
