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COATING OF POLYMERIC SUBSTRATE CATALYSTS ON METALLIC SURFACES

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Author(s): H. HOSSEINI | A. MEHRABANI-ZEINABAD

Journal: Chemical Industry and Chemical Engineering Quarterly
ISSN 1451-9372

Volume: 16;
Issue: 4;
Start page: 345;
Date: 2010;
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Keywords: polymeric substrate catalysts | surface coating technology | adhesion promoters

ABSTRACT
This article presents results of a study on coating of a polymeric substrate ca-talyst on metallic surface. Stability of coating on metallic surfaces is a proper specification. Sol-gel technology was used to synthesize adhesion promoters of polysilane compounds that act as a mediator. The intermediate layer was coated by synthesized sulfonated polystyrene-divinylbenzene as a catalyst for production of MTBE in catalytic distillation process. Swelling of catalyst and its separation from the metal surface was improved by i) increasing the quantity of divinylbenzene in the resin’s production process and ii) applying adhesion pro¬moters based on the sol-gel process. The rate of ethyl silicate hydrolysis was intensified by increasing the concentration of utilized acid while the conden¬sation polymerization was enhanced in the presence of OH–. Sol was formed at pH 2, while the pH should be 8 for the formation of gel. By setting the ratio of the initial concentrations of water to ethyl silicate to 8, the gel formation time was minimized.
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