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Type: Artigo de periódico
Title: Highly dispersed phosphate supported in a binary silica-titania matrix: Preparation and characterization
Author: Alfaya, AAS
Gushikem, Y
de Castro, SC
Abstract: Titanium phosphate supported in a mixed oxide matrix was prepared by reacting SiO2/TiO2, obtained from the sol-gel process, with phosphoric acid. HPO42- is the species present in the matrix, and it is immobilized by the Ti-O-P bond on the surface. The titanium phosphate is highly and homogeneously dispersed in the SiO2/TiO2 matrix, with the domain of titanium oxide particles about 1 nm, estimated from the UV absorption band threshold. The specific surface areas, determined by the BET multipoint method, changed between 397 and 755 m(2) g(-1) and the average pore volumes between 0.38 and 0.63 mL g(-1) for samples prepared with different contents of titanium phosphate. The titanium hydrogenphosphate is thermally very stable and showed a high proton exchange capacity between 0.50 and 1.10 mmol g(-1).
Country: EUA
Editor: Amer Chemical Soc
Citation: Chemistry Of Materials. Amer Chemical Soc, v. 10, n. 3, n. 909, n. 913, 1998.
Rights: fechado
Identifier DOI: 10.1021/cm970679e
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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