Counterdiffusion of liquid hydrocarbons in type Y zeolite: Effect of molecular size, molecular type, and direction of diffusion

Autor:	Rebecca M. Moore, James R. Katzer
Rok vydání:	1972
Předmět:	Molecular diffusion Environmental Engineering Cyclohexane General Chemical Engineering Diffusion Thermodynamics Toluene chemistry.chemical_compound chemistry Organic chemistry Molecule Phenol Zeolite Order of magnitude Biotechnology
Zdroj:	AIChE Journal. 18:816-824
ISSN:	1547-5905 0001-1541
Popis:	This paper presents experimental results on the counterdiffusion of liquid hydrocarbons in the Y zeolite as determined by an unsteady state technique using the zeolite powder. The critical diameter of aromatic molecules counterdiffusing with respect to cyclohexane into NaY zeolite has a marked effect upon the counterdiffusion rate. For a given molecular type, the single parameter of critical molecular diameter correlates the size effect well. Molecular type, for example, toluene vs. phenol, also has a pronounced effect on the counterdiffusion rate. Those molecules showing stronger interactions with the zeolite have lower counterdiffusion rates. In both NaY and SK-500, the diffusion coefficients for adsorptive counterdiffusion are an order of magnitude greater than the diffusion coefficients for desorptive counter-diffusion indicating that factors other than simple intracrystalline diffusion as such are also important in zeolite counterdiffusion. Simple diffusion models do not account for the differences observed indicating that a more sophisticated approach is necessary.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bb817bad33b354949f9596cbe6f4dc33 https://doi.org/10.1002/aic.690180426 Zobrazit plný text záznamu Plný text