Abstract
A computer-programmed microcalorimetric investigation of NH 3 adsorption at 423 K was applied to characterize the modified acidity of ZSM-5 zeolite impregnated with increasing amounts of H 3BO 3. Zeolite samples were pre-treated at two different temperature regimes: 1.33 mPa/673 K/12 h and 1.33 mPa/1073 K/12 h. A combination of volumetric, calorimetric and thermokinetic data revealed that the former pretreatment was responsible for removing part of the Bro˝nsted sites, while the latter also induced pore plugging, which therefore drastically reduced the overall zeolite acidity. Zeolite impregnation with increasing amounts of H 3BO 3 contributed to an increased loss of acidity. Special emphasis is placed on the effect of high-temperature treatment on lattice element exchange and its importance for zeolite-binder interactions.
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