Characterization of silica supported chromium complexes

Parentis, Monica Liliana; Bonini, Norberto Alejandro; Gonzo, Elio Emilio

info:eu-repo/semantics/article

Fecha

2000-03

Registro en:

Parentis, Monica Liliana; Bonini, Norberto Alejandro; Gonzo, Elio Emilio; Characterization of silica supported chromium complexes; Planta Piloto de Ingeniería Química; Latin American Applied Research; 30; 1; 3-2000; 41-50

0327-0793

http://hdl.handle.net/11336/73079

1851-8796

CONICET Digital

CONICET

https://repositorioslatinoamericanos.uchile.cl/handle/2250/4315003

Autor

Parentis, Monica Liliana

Bonini, Norberto Alejandro

Gonzo, Elio Emilio

Institución

Consejo Nacional de Investigaciones Científicas y Tecnológicas (Argentina)

Resumen

The Cr/SiO2 catalysts were prepared via the deposition of mononuclear and binuclear chromium (III) ammine complexes on silica. The influence of chromium loading and calcination temperatura upon the type of species formed was determined. FTIR and Raman studies revealed the presence of Cr(VI) species as monomers and dimers in calcined catalysts and the existence of a chemical interaction between the complex chromium ions and the support. Futhemore, IR of adsorbed pyridine showed the presence of Lewis centers just before calcination. After calcination Brönsted sites were developed, these sites were related to the presence of Cr(VI) species. The relative concentration of such centers depends on the ammount of chromium exchanged.

Materias

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