کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
673627 | 1459517 | 2013 | 6 صفحه PDF | دانلود رایگان |
The influence of the alkaline treatment on the acidity of zeolite ZSM-5 (SiO2/Al2O3 = 23, 50 and 80) modified by desilication was investigated. The samples were characterized by X-ray diffraction, low temperature adsorption of nitrogen and solid-state 27Al MAS NMR. Acidity of the samples was investigated using microcalorimetry-volumetry of ammonia adsorption at 423 K. Acid sites accessibility and intracrystalline diffusion were estimated by the thermokinetic parameter. The desilication process was shown to be Si/Al ratio dependant. Relative enhancement of mesopore surface decreased in the following order of SiO2/Al2O3: 50 > 8 0 >23. Pore size distribution broadened and mesopore sizes increased with increasing Si/Al ratio. For samples with SiO2/Al2O3 = 50 and 80 almost full preservation of acid sites strength and distribution was achieved. Significant alteration of the acidity was found for the mesoporous sample with SiO2/Al2O3 = 23. Thermokinetic parameter values indicate facilitated intracristalline diffusion for mesoporous samples.
► Mesopore creation in three different HZSM-5 zeolites was performed via desilication.
► Acidity was assessed by microcalorimetric and thermokinetic data.
► ZSM-5 with SiO2/Al2O3 = 23 proved to be the least susceptable to mesopore creation.
► Acidity of samples with SiO2/Al2O3 = 50 and 80 remained mostly unchanged by desilication, while the surface diffusion was improved.
Journal: Thermochimica Acta - Volume 567, 10 September 2013, Pages 73–78