¹²⁹Xe NMR of adsorbed xenon and ¹H NMR imaging: new methods to study the diffusion of gaseous hydrocarbons in a fixed bed of zeolite

• Autorzy: N'Gokoli-Kekele P. , Springuel-Huet M.-A. , Bonardet J.-L. , Dereppe J.-M. , Fraissard J.
• Języki publikacji: EN

Abstrakty

EN

^{129Xe NMR of adsorbed xenon used as a probe and (1)H NMR imaging have been used to study the diffusion of hydrocarbons (benzene, n-hexane, paraxylene) during their adsorption or desorption in a fixed bed of zeolite crystallites. The simulation of experimental (129)Xe spectra using the nonuniform or the shrinking core models gives the concentration profiles of hydrocarbons, in the bed and in the zeolite crystallites, during their adsorption and leads to intracrystalline diffusion coefficients in good agreement with the literature. The (1)H NMR imaging allows one to visualize the progression of the diffusing molecules in the zeolite bed and also to determine their intracrystalline diffusion coefficients in the simplest cases.}

Słowa kluczowe

EN

xenon; hydrogen; NMR; zeolite; diffusion of gases; adsorption

PL

ksenon; wodór; rezonans jądrowy magnetyczny; zeolit; dyfuzja gazu; adsorpcja

• Wydawca: Centrum Upowszechniania Nauki PAN
• Czasopismo: Bulletin of the Polish Academy of Sciences. Chemistry
• Rocznik: 2002
• Tom: Vol. 50, No. 2
• Strony: 249--258
• Opis fizyczny: Bibliogr. 12 poz.

Twórcy

autor

N'Gokoli-Kekele P.

autor

Springuel-Huet M.-A.

autor

Bonardet J.-L.

autor

Dereppe J.-M.

autor

Fraissard J.

• Laboratoire S.I.E.N. -Chimie des Surfaces, FRE-CNRS 2312, Universite P. et M. Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France