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  • 1 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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Manuscript submission: www.editorialmanager.com/reac

  • Impact Factor (2019): 1.520
  • Scimago Journal Rank (2019): 0.345
  • SJR Hirsch-Index (2019): 39
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • SJR Quartile Score (2019): Q4 Catalysis
  • Impact Factor (2018): 1.142
  • Scimago Journal Rank (2018): 0.374
  • SJR Hirsch-Index (2018): 37
  • SJR Quartile Score (2018): Q3 Physical and Theoretical Chemistry
  • SJR Quartile Score (2018): Q3 Catalysis

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Reaction Kinetics, Mechanisms and Catalysis
Language English
Size B5
Year of
Foundation
1974
Volumes
per Year
3
Issues
per Year
6
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1878-5190 (Print)
ISSN 1878-5204 (Online)