Efficient catalytic oxidation of ethylbenzene to acetophenone was realized using the catalytic system of cobalt zeolitic imidazolate framework ZIF-67/N-hydroxyphthalimide(NHPI) under mild conditions. 95.2% conversion of ethylbenzene with 90.3% selectivity to acetophenone could be obtained at 373 K under 0.3 MPa O2 for 9 h. The results show that there exists synergetic effect between ZIF-67 and NHPI. 1-Phenylethyl hydroperoxide(PEHP) was generated via a radical process involving the hydrogen abstraction from ethylbenzene by phthalimide N-oxyl, and subsequently effectively decomposed to acetophenone by ZIF-67.
The catalytic oxidation of biomass-derived polyhydroxyl compounds provides an efficient and green route for biomass resource utility.Gold nanocrystals supported on Mg(OH)2 were synthesized by sol-immobilization method,characterized by XRD,TEM,UV-vis DRS,and tested in the selective oxidation of 1,2-propanediol to lactic acid.The gold particle size and the ratio of Au to 1,2-propanediol strongly influenced the catalytic activity.Over Au/Mg(OH)2 with the majority of gold particles concentrated in 14-18 nm,excellent catalytic performance with 94.4% conversion and 89.3% selectivity to lactic acid has been achieved under 0.3 MPa O2 at 60°C for 6 h.
MA Hong1,NIE Xin1,CAI JiaYing1,2,CHEN Chen1,GAO Jin1,MIAO Hong1 & XU Jie1* 1State Key Laboratory of Catalysis
