Dealumination of ZSM-5 — Characterization by TPD, DTA/DTG, XPS and Adsorption Measurements
- 1 June 1988
- journal article
- research article
- Published by SAGE Publications in Adsorption Science & Technology
- Vol. 5 (2) , 127-138
- https://doi.org/10.1177/026361748800500204
Abstract
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/p0 ≦ 0.1 and the amount of chemisorbed NH3 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.Keywords
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