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مقاله Permeation properties of a graded structure composite ceramic membrane prepared by CVD method word دارای 8 صفحه می باشد و دارای تنظیمات در microsoft word می باشد و آماده پرینت یا چاپ است

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بخشی از متن مقاله Permeation properties of a graded structure composite ceramic membrane prepared by CVD method word :

سال انتشار: 1390

محل انتشار: هفتمین کنگره ملی مهندسی شیمی

تعداد صفحات: 8

نویسنده(ها):

Ensieh Ganji Babakhani – Research Institue of Petroleum Industry,Tehran,Iran
Mahdi Amanipour – Sharif University of Technology,Tehran,Iran
Aliakbar Safe kordi – Sharif University of Technology,Tehran,Iran
Akbar Zamaniyan – Research Institue of Petroleum Industry,Tehran,Iran

چکیده:

Permeation properties of a hydrogen permselective ceramic membrane for single gases (H2, CH4, N2 and CO2) have been studied. The membrane was prepared by depositing a thin layer of SiO2 onthe inner side of a tubular modified alumina layer by chemical vapor deposition (CVD) method.The modification process was carried out by coating the macroporous -alumina substrate with different layers of -alumina to obtain a graded structure support. XRD, SEM and EDAX analysis were used to characterize the membrane. Cross-sectional and surface images obtained from SEMshowed that the intermediate layer had a thickness of 2 m with a median pore size of about 50 nm and the top selective silica layer was uniform and dense with a thickness of about 100 nm. Permeation tests showed that H2 permeation flux reduced from 5*10-5 molm-2s-1pa-1 to 6*10-7 molm-2s-1pa-1 as the CVD deposition time proceeded from 0 to 6 h and H2 selectivities over CH4, N2 and CO2 increased from 2.2, 5.6 and 7.9 to 105, 178 and 446, respectively

 

 

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