Olefin epoxidation is a fundamental reaction in organic chemistry.Herein,a novel magnetic core-shell Fe_(3)O_(4)@Cu_(3)(BTC)_(2) metal-organic framework(MOF)heterogeneous catalyst was synthesized for the use in olefin...Olefin epoxidation is a fundamental reaction in organic chemistry.Herein,a novel magnetic core-shell Fe_(3)O_(4)@Cu_(3)(BTC)_(2) metal-organic framework(MOF)heterogeneous catalyst was synthesized for the use in olefin epoxidation.Additionally,the size selectivity of the Fe_(3)O_(4)@Cu_(3)(BTC)_(2) catalyst in olefin epoxidation was investigated.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)results indicated that Fe_(3)O_(4)@Cu_(3)(BTC)_(2) presented a microsphere morphology,and Cu_(3)(BTC)_(2) MOFs were well dispersed on the Fe_(3)O_(4)(PAA)surface after 10 cycles of the synthesis process.The synthesized magnetic core-shell Fe_(3)O_(4)@Cu_(3)(BTC)_(2) heterogeneous catalyst could facilitate efficient aerobic olefin epoxidation.Furthermore,the catalyst was used in the aerobic oxidation of alcohols and was found to exhibit excellent activity for primary alcohols.展开更多
The tliree-dimensional copper-doped zeolitic imidazolate framework ZIF-8(Cu^Ⅱ/ZIF-8) was prepared by a metal ion exchange process, using reaction of three different copper salts, zinc nitrate hexahydrate[Zn(NO)3·...The tliree-dimensional copper-doped zeolitic imidazolate framework ZIF-8(Cu^Ⅱ/ZIF-8) was prepared by a metal ion exchange process, using reaction of three different copper salts, zinc nitrate hexahydrate[Zn(NO)3·6H2O] and 2?methylimidazole(2-MelM) under nitrogen atmosphere at the room temperature. The TEM and PXRD results indicated that the morphology of Cu^Ⅱ/ZIF-8 was rhombic dodecahedron and the structure was intact after copper was doped into the porous ZIF-8. The synthesized Cu(NO3)2/ZIF-8 heterogeneous catalyst showed an excellent activity for tlie aerobic oxidation of primary alcohols employing molecular oxygen as oxidant. Moreover, tlie Cu(NO3)2/ZIF-8 heterogeneous catalyst can cycled 15 times without leaching of copper.展开更多
基金supported by the Research Foundation of Hebei Agriculture University(China)for Talented Scholars(No.YJ201815)the Basic Scientific Research Project of Scientific Colleges and Universities in Hebei Province,China(No.KY2022017).
文摘Olefin epoxidation is a fundamental reaction in organic chemistry.Herein,a novel magnetic core-shell Fe_(3)O_(4)@Cu_(3)(BTC)_(2) metal-organic framework(MOF)heterogeneous catalyst was synthesized for the use in olefin epoxidation.Additionally,the size selectivity of the Fe_(3)O_(4)@Cu_(3)(BTC)_(2) catalyst in olefin epoxidation was investigated.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)results indicated that Fe_(3)O_(4)@Cu_(3)(BTC)_(2) presented a microsphere morphology,and Cu_(3)(BTC)_(2) MOFs were well dispersed on the Fe_(3)O_(4)(PAA)surface after 10 cycles of the synthesis process.The synthesized magnetic core-shell Fe_(3)O_(4)@Cu_(3)(BTC)_(2) heterogeneous catalyst could facilitate efficient aerobic olefin epoxidation.Furthermore,the catalyst was used in the aerobic oxidation of alcohols and was found to exhibit excellent activity for primary alcohols.
文摘The tliree-dimensional copper-doped zeolitic imidazolate framework ZIF-8(Cu^Ⅱ/ZIF-8) was prepared by a metal ion exchange process, using reaction of three different copper salts, zinc nitrate hexahydrate[Zn(NO)3·6H2O] and 2?methylimidazole(2-MelM) under nitrogen atmosphere at the room temperature. The TEM and PXRD results indicated that the morphology of Cu^Ⅱ/ZIF-8 was rhombic dodecahedron and the structure was intact after copper was doped into the porous ZIF-8. The synthesized Cu(NO3)2/ZIF-8 heterogeneous catalyst showed an excellent activity for tlie aerobic oxidation of primary alcohols employing molecular oxygen as oxidant. Moreover, tlie Cu(NO3)2/ZIF-8 heterogeneous catalyst can cycled 15 times without leaching of copper.
