Dealumination of ZSM-5 — Characterization by TPD, DTA/DTG, XPS and Adsorption Measurements
A series of ZSM 5 samples obtained by dealumination is studied by TPD, DTA/DTG, XPS and adsorption measurements. The amount of adsorbed water at p/p 0 ≦ 0.1 and the amount of chemisorbed NH 3 corresponding to the TPD peak at 693–723 K correlate with the number of framework aluminium atoms per unit c...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
1988-06-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/026361748800500204 |
| Summary: | A series of ZSM 5 samples obtained by dealumination is studied by TPD, DTA/DTG, XPS and adsorption measurements. The amount of adsorbed water at p/p 0 ≦ 0.1 and the amount of chemisorbed NH 3 corresponding to the TPD peak at 693–723 K correlate with the number of framework aluminium atoms per unit cell. At strong dealumination an enrichment of non-framework aluminium in the surface layers of the crystals was found. The HZSM-57 zeolites are transformed into silicalite-like samples during the course of the DTA experiment in the temperature range 973–1273 K. |
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| ISSN: | 0263-6174 2048-4038 |