Role of the acid-base properties of aluminas, modified γ-alumina, and silica-alumina in 1-butanol dehydration
1987; Elsevier BV; Volume: 31; Issue: 2 Linguagem: Inglês
10.1016/s0166-9834(00)80702-2
ISSN1873-3867
AutoresP. Berteau, S. Cęckiewicz, B. Delmon,
Tópico(s)Catalysis and Oxidation Reactions
ResumoThe acid-base properties of pure aluminas (γ-Al2O3 and ν-Al2O3), of γ-Al2O3 modified by introduction of Na+ and F− ions, and of a silica-alumina were determined by temperature programmed desorption (TPD) of NH3, CO2 and 1-butene, used separately, and by infrared spectroscopy (IR) of pyridine and pyrrole as probe molecules. A dependence between surface acidity and basicity of aluminas and their catalytical activity in 1-butanol dehydration was found. Coke deposits on used catalysts were studied by FT-IR spectroscopy and thermal analysis. New potentials of CO2 TPD and 1-butene TPD methods were discovered. The first method is very useful for comparing the basicity (Lewis type) in the series of catalysts. The second one confirms the presence of some Brönsted acid sites, on fluorine treated γ-alumina, non-visible by the IR spectroscopy of pyridine.
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