NMR study on the acidity of TS-1 zeolite
Data(s) |
01/10/2002
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Resumo |
The acidic properties of TS-1 and Silicalite-I zeolites have been investigated by the solid-state MAS NMR technique capable of in situ sample pretreatment. As shown by a combination of the P-31 MAS NMR and H-1 MAS NMR techniques with trimethylphosphine, not only Bronsted acid sites but also Lewis acid sites exist in the TS-1 zeolites. Moreover, TS-1 zeolite is more acidic compared with Silicalite-1. The H-1, Si-29 MAS NMR spectra and the resonance related to Bronsted acid species in the P-31 MAS NMR spectra demonstrate clearly that the presence of titanium in the framework results in the formation of a new hydroxy group, titanols, which is more acidic than silanols of Silicalite-1. The P-31 MAS NMR measurements also illustrate convincingly the existence of at least two different Lewis acid species on the TS-1 zeolites. The conversion of propylene oxide into methoxypropanol catalyzed by TS-1 or Silicalite-I zeolite in methanol solution as a test reaction has also been described. With the increase of titanium in zeolite, TS-1 appears to have a higher activity during the reaction of propylene oxide to methoxypropanol. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
庄建勤;严志敏;刘秀梅;刘宪春;韩秀文;包信和.NMR study on the acidity of TS-1 zeolite,Catalysis Letters,2002,83(1-2):87-91 |
Palavras-Chave | #TS-1 zeolite #solid-state MAS NMR #acidity |
Tipo |
期刊论文 |