[In situ diffuse reflectance FTIR spectroscopy characterization of titanium silicalite-1 catalytic oxidization of styrene].
Guang Pu Xue Yu Guang Pu Fen Xi
; 27(5): 886-8, 2007 May.
Article
em Zh
| MEDLINE
| ID: mdl-17655095
ABSTRACT
The Stability of framework of titanium silicalite-1 (TS-1) was investigated by high temperature diffuse reflectance FT-IR spectroscopy (DRIFTS), and the results showed that the 960 cm(-1) peak belonging to Ti-framework was stabilized at 673 K, but the two peaks belonging to framework shifted to lower frequencies by about 13 cm(-1) at 673 K. The effect on the framework after H2O2 adsorption was discussed. The results showed that the 960 cm(-1) peak lowered and shifted to high frequencies by about 11 cm(-1), but it recovered with vacuum or heating up. It was suggested that the 960 cm(-1) peak characterizes Ti==O, and this explained why the 960 cm(-1) peak shifted to high frequencies well. TS-1 catalytic oxidization of styrene was investigated by in situ DRIFTS. The reaction process was detected and phenyl aldehyde was the main product. Based on in situ analysis, it was proposed that H2O2 was adsorbed on Ti in framework of TS-1 to form active center.
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Base de dados:
MEDLINE
Assunto principal:
Titânio
/
Espectroscopia de Infravermelho com Transformada de Fourier
/
Silicatos
/
Estireno
Idioma:
Zh
Ano de publicação:
2007
Tipo de documento:
Article