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	Preparation of SiO/sub 2//( gamma -Fe/sub 2/O/sub 3/-SiO/sub 2/) magnetic catalyst carrier
	Wang Song-wei ; Xu Sheng-ming ; Chen Song-zhe ; Xu Jing-ming
	2010-05-10 ; 2010-05-10
关键词	Experimental/ coatings differential thermal analysis iron compounds nanocomposites scanning electron microscopy silicon compounds sol-gel processing transmission electron microscopy X-ray diffraction/ magnetic catalyst carrier sol-gel method coatings XRD TG-DTA TEM SEM VSM amorphous SiO/sub 2/ layer magnetic properties nanocomposites sorbent carriers 700 degC 30 min 150 to 200 nm SiO/sub 2/-(Fe/sub 2/O/sub 3/-SiO/sub 2/)/ A8120Q Preparation of glass-based composites A8115L Deposition from liquid phases (melts and solutions)/ temperature 9.73E+02 K time 1.8E+03 s size 1.5E-07 to 2.0E-07 m/ SiO2-Fe2O3-SiO2/int Fe2O3/int SiO2/int Fe2/int Fe/int O2/int O3/int Si/int O/int Fe2O3/bin SiO2/bin Fe2/bin Fe/bin O2/bin O3/bin Si/bin O/bin
中文摘要	Fe/sub 2/O/sub 3/-SiO/sub 2/ composite was prepared with sol-gel method, SiO/sub 2//( gamma -Fe/sub 2/O/sub 3/-SiO/sub 2/) magnetic catalyst carriers were obtained by coating composite with silica. These obtained samples were characterized by XRD, TG-DTA, TEM, SEM and VSM. The effects of processing temperature, time and initial dosage of iron nitrate on the properties of Fe/sub 2/O/sub 3/-SiO/sub 2/ were studied. The results show that, after calcined at 700 degrees C for 30 min, the composite oxide containing gamma -Fe/sub 2/O/sub 3/ phase is secured. While further increase of the processing temperature (>800 degrees C) or time results in the formation of alpha -Fe/sub 2/O/sub 3/ phase. SEM and TEM analyses show that the SiO/sub 2//( gamma -Fe/sub 2 /O/sub 3/-SiO/sub 2/) sample is of nanosized, monodisperse spherical particles with size of 150-200 nm, which are well coated by amorphous SiO/sub 2/ layer. The VSM data exhibit that SiO /sub 2//( gamma -Fe/sub 2/O/sub 3/-SiO/sub 2/) has much better magnetic properties than SiO/sub 2//Fe/sub 3/O/sub 4/. Such nanocomposites are very promising in application as magnetic catalyst carriers and sorbent carriers.
语种	中文 ; 中文
出版者	Editorial Office of Chinese J. Nonferrous Met ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/23167]
专题	清华大学
推荐引用方式 GB/T 7714	Wang Song-wei,Xu Sheng-ming,Chen Song-zhe,et al. Preparation of SiO/sub 2//( gamma -Fe/sub 2/O/sub 3/-SiO/sub 2/) magnetic catalyst carrier[J],2010, 2010.
APA	Wang Song-wei,Xu Sheng-ming,Chen Song-zhe,&Xu Jing-ming.(2010).Preparation of SiO/sub 2//( gamma -Fe/sub 2/O/sub 3/-SiO/sub 2/) magnetic catalyst carrier..
MLA	Wang Song-wei,et al."Preparation of SiO/sub 2//( gamma -Fe/sub 2/O/sub 3/-SiO/sub 2/) magnetic catalyst carrier".(2010).

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