Effects of Ethanolamines Catalysts on Synthesis of Silica Aerogel

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Abstract With tetraethyoxysilane ( TEOS) as the source of silicon,hydrochloric acid as acid catalyst, ethanolamines or their aqueous solutions as basic catalyst,SiO2 aerogel was prepared by sol-gel technique and dried under the conditions of negative pressure and temperature programm. The ethanolamines have the properties of the ammonia and the ethanol,the effects of concentration,amount and catalytic ability of ethanolamines on the performance of aerogel were investigated in silica aerogel synthesis. The results showed that the catalytic ability of ethanolamines catalysts was mono-ethanolamines ( MET) > di-ethanolamines (DEA) > tri-ethanolamines (TEA),the appropriate ratio of DEA /TEOS(mol /mol) were 17 �� 10 -3,17 �� 10 -3,51 �� 10 - 3 respectively and the optimal concentration of aqueous solutions(V /V) were 1�� 20,1 �� 5,1 �� 2 respectively. The SiO2 aerogel has well configuration,high porosity ( more than 88. 68% ) and large surface area (about 687 m2 /g).

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Received 2010-05-15; published 2010-05-15

Cite this article:

WANG Wen-jin,WANG Xue-feng,HUANG Xue-li .Effects of Ethanolamines Catalysts on Synthesis of Silica Aerogel[J] Chemcial Industry and Engineering, 2010,V27(3): 219-223

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