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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 9
BKCSDE 25(9)
September 20, 2004 

 
Title
Synthesis of Silica Membranes on a Porous Stainless Steel by Sol-Gel Method and Effect of Preparation Conditions on Their Permselectivity
Author
Dong-Wook Lee, Seung-Eun Nam, Bongkuk Sea, Son-Ki Ihm, Kew-Ho Lee*
Keywords
Silica composite membrane, Sol-gel method, Hydrogen purification
Abstract
A porous stainless steel (SUS) as a substrate of silica composite membranes for hydrogen purification was used to improve mechanical strength of the membranes for industrial application. The SUS support was successfully modified by using submicron Ni powder, SiO2 sols with particle size of 500 nm and 150 nm in turns. Silica top layer was coated on the modified supports under various preparation conditions such as calcination temperature, dipping time and repeating number of dipping-drying process. The calcination temperature for proper sintering was between H ttig temperature and Tamman temperature of the coating materials. Maximum hydrogen selectivity was investigated by changing dipping time. As repeating number of dipping-drying process increased, permeances of nitrogen and hydrogen were decreased and H2/N2 selectivity was increased due to the reduction of non-selective pinholes and mesopores. For the silica membrane prepared under optimized conditions, permeance of hydrogen was about 3 × 10?5 cm3·cm?2·s?1·cmHg?1 combined with H2/N2 seletivity of about 20.
Page
1371 - 1378
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