Abstract
Synthesis of various types of zeolites has been reported using as a starting material silica sols, gels, silicates or silicate minerals, all of which are polymers of silicic acid. In this study Zeolite A was synthesized from ethyl orthosilicate which was probably a monomer at the beginning of hydrolysis. Optimum conditions of synthesis and factors which influence the formation of Zeolite A were examined. Ethyl orthosilicate was directly hydrolyzed by sodium aluminate solution in the presence of excess sodium hydroxide. After ultrasonic and mechanical stirring for an hour at 70/sup 0/C, the solution was kept in the air bath at 70/sup 0/C under atmospheric pressure for 48 approximately 120 hours. Zeolite A with high purity and crystallinity was obtained in a good yield from the starting mixture with the composition of 2 approximately 4.5 Na/sub 2/O . Al/sub 2/O/sub 3/ . 0.5 approximately 2 SiO/sub 2/ . 200 approximately 400 H/sub 2/O. Present method was effective for the synthesis of Zeolite A in the lower molar ratios of SiO/sub 2//Al/sub 2/O/sub 3/ as compared with the ordinary methods using silica or silicates. The species formed were also investigated by the optical, x-ray diffraction, DTA, TGA, IR and chemical methods.
Citation Formats
Hino, R, and Toki, K.
Optimum conditions of the synthesis of zeolite A by the direct hydrolysis of ethyl orthosilicate.
Japan: N. p.,
1975.
Web.
Hino, R, & Toki, K.
Optimum conditions of the synthesis of zeolite A by the direct hydrolysis of ethyl orthosilicate.
Japan.
Hino, R, and Toki, K.
1975.
"Optimum conditions of the synthesis of zeolite A by the direct hydrolysis of ethyl orthosilicate."
Japan.
@misc{etde_7154235,
title = {Optimum conditions of the synthesis of zeolite A by the direct hydrolysis of ethyl orthosilicate}
author = {Hino, R, and Toki, K}
abstractNote = {Synthesis of various types of zeolites has been reported using as a starting material silica sols, gels, silicates or silicate minerals, all of which are polymers of silicic acid. In this study Zeolite A was synthesized from ethyl orthosilicate which was probably a monomer at the beginning of hydrolysis. Optimum conditions of synthesis and factors which influence the formation of Zeolite A were examined. Ethyl orthosilicate was directly hydrolyzed by sodium aluminate solution in the presence of excess sodium hydroxide. After ultrasonic and mechanical stirring for an hour at 70/sup 0/C, the solution was kept in the air bath at 70/sup 0/C under atmospheric pressure for 48 approximately 120 hours. Zeolite A with high purity and crystallinity was obtained in a good yield from the starting mixture with the composition of 2 approximately 4.5 Na/sub 2/O . Al/sub 2/O/sub 3/ . 0.5 approximately 2 SiO/sub 2/ . 200 approximately 400 H/sub 2/O. Present method was effective for the synthesis of Zeolite A in the lower molar ratios of SiO/sub 2//Al/sub 2/O/sub 3/ as compared with the ordinary methods using silica or silicates. The species formed were also investigated by the optical, x-ray diffraction, DTA, TGA, IR and chemical methods.}
journal = []
volume = {11}
journal type = {AC}
place = {Japan}
year = {1975}
month = {Nov}
}
title = {Optimum conditions of the synthesis of zeolite A by the direct hydrolysis of ethyl orthosilicate}
author = {Hino, R, and Toki, K}
abstractNote = {Synthesis of various types of zeolites has been reported using as a starting material silica sols, gels, silicates or silicate minerals, all of which are polymers of silicic acid. In this study Zeolite A was synthesized from ethyl orthosilicate which was probably a monomer at the beginning of hydrolysis. Optimum conditions of synthesis and factors which influence the formation of Zeolite A were examined. Ethyl orthosilicate was directly hydrolyzed by sodium aluminate solution in the presence of excess sodium hydroxide. After ultrasonic and mechanical stirring for an hour at 70/sup 0/C, the solution was kept in the air bath at 70/sup 0/C under atmospheric pressure for 48 approximately 120 hours. Zeolite A with high purity and crystallinity was obtained in a good yield from the starting mixture with the composition of 2 approximately 4.5 Na/sub 2/O . Al/sub 2/O/sub 3/ . 0.5 approximately 2 SiO/sub 2/ . 200 approximately 400 H/sub 2/O. Present method was effective for the synthesis of Zeolite A in the lower molar ratios of SiO/sub 2//Al/sub 2/O/sub 3/ as compared with the ordinary methods using silica or silicates. The species formed were also investigated by the optical, x-ray diffraction, DTA, TGA, IR and chemical methods.}
journal = []
volume = {11}
journal type = {AC}
place = {Japan}
year = {1975}
month = {Nov}
}