NDLI: Energetic Characterization of Faujasite Zeolites Using a Sensor Gas Calorimeter

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Energetic Characterization of Faujasite Zeolites Using a Sensor Gas Calorimeter

Content Provider	MDPI
Author	Christian, Bläker Mauer, Volker Pasel, Christoph Bathen, Dieter
Copyright Year	2021
Description	In addition to the adsorption mechanism, the heat released during exothermic adsorption influences the chemical reactions that follow during heterogeneous catalysis. Both steps depend on the structure and surface chemistry of the catalyst. An example of a typical catalyst is the faujasite zeolite. For faujasite zeolites, the influence of the Si/Al ratio and the number of Na+ and Ca2+ cations on the heat of adsorption was therefore investigated in a systematic study. A comparison between a NaX (Sodium type X faujasite) and a NaY (Sodium type Y faujasite) zeolite reveals that a higher Si/Al ratio and therefore a smaller number of the cations in faujasite zeolites leads to lower loadings and heats. The exchange of Na+ cations for Ca2+ cations also has an influence on the adsorption process. Loadings and heats first decrease slightly at a low degree of exchange and increase significantly with higher calcium contents. If stronger interactions are required for heterogeneous catalysis, then the CaNaX zeolites must have a degree of exchange above 53%. The energetic contributions show that the highest-quality adsorption sites III and III’ make a contribution to the load-dependent heat of adsorption, which is about 1.4 times (site III) and about 1.8 times (site III’) larger than that of adsorption site II.
Starting Page	98
e-ISSN	20734344
DOI	10.3390/catal11010098
Journal	Catalysts
Issue Number	1
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-01-12
Access Restriction	Open
Subject Keyword	Catalysts Environmental Engineering Heat of Adsorption Adsorption Isotherms Energetic Contributions Faujasite Zeolites Canax Methane Sensor Gas Calorimeter
Content Type	Text
Resource Type	Article

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