Abstract
The acidic and catalytic properties of a series of silicon-tantalum mixed oxides containing between 0 and 30 at% tantalum were characterized by temperature-programmed desorption of ammonia, by FTIR spectra of adsorbed pyridine, and by the test reaction of 1-butanol dehydration at 250-300°C. Probe molecule adsorption and catalytic testing show an acid site generation in silicon-tantalum mixed oxides compared to pure tantalum oxide. Both Brønsted and Lewis acid sites are present on the mixed oxide surface. Brønsted and Lewis acid sites seem to be weaker in SiO 2-Ta 2O 5 mixed oxide than in analogous SiO 2-Al 2O 3, since a greater reaction temperature is required to achieve the same conversion in the above test reaction. However, a great advantage of this new solid acid is the production of butenes with 100% selectivity.
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