Influence of hydrothermal pretreatment on zeolitic diffusivity detected by comparative sorption kinetics and small-angle X-ray scattering investigations
✍ Scribed by Martin Bülow; Peter Struve; Stanislaw Pikus
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 331 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0144-2449
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✦ Synopsis
Uptake data for ethane and n-decane on normally as well as hydrothermally pretreated zeolites NaCa-A and NaMg-A, respectively, are discussed as being limited by a crystal interface transport resistance. Small-angle X-ray scattering properties of these samples indicate that due to hydrothermal pretreatment, structure regions are built up whose elctronic density is different from that of zeolite. Comparing the results obtained with both techniques with earlier described n.m.r, self-diffusion behaviour of ethane on the same NaCa-A zeolites, the conclusion is drawn that heterogeneity regions detected should be localized at the zeolitic interface and strengthen its transport resistance.