Diffusion of linear and branched alkanes in ZSM-5. A quasi-elastic neutron scattering study

✍ Scribed by H. Jobic

• Book ID: 104420863
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 142 KB
• Volume: 158
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(00)00057-1

✦ Synopsis

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. The diffusivities of long n-alkanes in ZSM-5 have been measured by quasi-elastic neutron scattering QENS . Self-diffusion coefficients and activation energies for chains up to C have been obtained. Reasonable agreement is 14 observed with single-crystal membrane experiments, except for C , but large discrepancies are found with the zero-length 6

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. column ZLC method. The diffusivities predicted by a hierarchical simulation diverge from those measured by QENS after C , although the activation energies for diffusion are comparable. The discrepancy with MD simulations is larger. QENS 6 results show that diffusion of branched alkanes is much more restricted than the one of linear alkanes in this structure.