Authors:
Luis Ernesto Sandoval-Díaz Laboratorio de Catálisis Heterogénea, Departamento de Química, Universidad Nacional de Colombia, Carrera 45 No. 26-85, Bogotá, Colombia, edcoyb@unal.edu.co, lesandovaldi@unal.edu.co

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Ericsson David Coy-Barrera Laboratorio de Catálisis Heterogénea, Departamento de Química, Universidad Nacional de Colombia, Carrera 45 No. 26-85, Bogotá, Colombia, edcoyb@unal.edu.co, lesandovaldi@unal.edu.co

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Carlos Alexander Trujillo Laboratorio de Catálisis Heterogénea, Departamento de Química, Universidad Nacional de Colombia, Carrera 45 No. 26-85, Bogotá, Colombia, edcoyb@unal.edu.co, lesandovaldi@unal.edu.co

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Abstract

The catalytic effect of fluoride on the polymerization of sodium silicate and phosphoric acid solutions at pH 7.15 was studied through a simple and inexpensive method: the observation of the meniscus of the resulting sol in a test tube. Reaction was found to be second-order regarding silicate concentration as reported previously. Novel results show that the reaction also follows a pseudo-second-order kinetics with respect to fluoride. A rate law for the catalyzed polymerization of the form r = Kv[Si(OH)4][HF]2 was established. A mechanism for fluoride action on silica polymerization, where silicon increases its coordination number to five, is proposed.

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Reaction Kinetics, Mechanisms and Catalysis
Language English
Size B5
Year of
Foundation
1974
Volumes
per Year
1
Issues
per Year
6
Founder Akadémiai Kiadó
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Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
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Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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ISSN 1878-5190 (Print)
ISSN 1878-5204 (Online)