Preparation and properties of magnetic alumina microspheres with a γ-Fe_2O_3/SiO_2 core and Al_2O_3 shell  

作　　者：Qingtao Fu Tingting He Lianqing Yu Yongming Chai Chenguang Liu 

机构地区：[1]State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, Shandong, China [2]Key Laboratory of Catalysis, CNPC, China University of Petroleura, Qingdao 266555, Shandong, China

出　　处：《Journal of Natural Gas Chemistry》2011年第1期72-76,共5页天然气化学杂志（英文版）

基　　金：supported by the State Key Basic Research Program of PRC (2006CB202505);the National Natural Science Foundation of China (20806093)

摘　　要：Magnetic alumina composite microspheres with γ-Fe 2 O 3 core/Al 2 O 3 shell structure were prepared by the oil column method. A dense silica layer was deposited on the surface of γ-Fe 2 O 3 particles （denoted as γ-Fe 2 O 3 /SiO 2 ） with a desired thickness to protect the iron oxide core against acidic or high temperature conditions. γ-Fe 2 O 3 /SiO 2 /Al 2 O 3 particles with about 85 wt% Al 2 O 3 were obtained and showed to be suitable for practical applications as a magnetic catalyst or catalyst support due to their magnetic properties and pore structure. The products were characterized with scanning electron microscope （SEM） and transmission electron microscope （TEM）, nitrogen adsorption-desorption, and vibrating sample magnetometer （VSM）. The specific surface area and pore volume of the γ-Fe 2 O 3 /SiO 2 /Al 2 O 3 composite microspheres calcined at 500 ？ C were 200 m 2 /g and 0.77 cm 3 /g, respectively.Magnetic alumina composite microspheres with γ-Fe 2 O 3 core/Al 2 O 3 shell structure were prepared by the oil column method. A dense silica layer was deposited on the surface of γ-Fe 2 O 3 particles （denoted as γ-Fe 2 O 3 /SiO 2 ） with a desired thickness to protect the iron oxide core against acidic or high temperature conditions. γ-Fe 2 O 3 /SiO 2 /Al 2 O 3 particles with about 85 wt% Al 2 O 3 were obtained and showed to be suitable for practical applications as a magnetic catalyst or catalyst support due to their magnetic properties and pore structure. The products were characterized with scanning electron microscope （SEM） and transmission electron microscope （TEM）, nitrogen adsorption-desorption, and vibrating sample magnetometer （VSM）. The specific surface area and pore volume of the γ-Fe 2 O 3 /SiO 2 /Al 2 O 3 composite microspheres calcined at 500 ？ C were 200 m 2 /g and 0.77 cm 3 /g, respectively.

关 键 词：γ-Fe 2 O 3 microsphere alumina CORE-SHELL sol-gel method 

分 类 号：TQ460.4[化学工程—制药化工] TQ133.1