![]() Lewis acid sites were not detected with the probe. The extinction coefficients of the 1615 cm –1 diagnostic bands of 2,6-di- tert-butylpyridine interacting with Brønsted acid sites were determined. ![]() ![]() Accessibility studies of acid sites in zeolites TNU-9 and BEA involving quantitative IR measurements with hindered 2,6-di- tert-butylpyridine as a probe were performed. The 2,6-di- tert-butylpyridine was too large to enter the micropores, even in wide pore zeolites, and nearly no sites in nonmesoporous zeolites were available. This work was aimed to evidence that substituted pyridine, 2,6-di- tert-butylpyridine, is a suitable probe for the quantitative investigation of the external acidity in hierarchically structured zeolites.
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