Dealumination of HZSM-5 zeolites. II. Methanol to gasoline conversion
- Univ. of Auckland (New Zealand)
- Industrial Research Ltd., Petone (New Zealand); and others
Changes in the structure and properties of HZSM-5 zeolites used for extended periods as catalysts in the conversion of methanol to gasoline have been investigated. HZSM-5 samples were characterized using solid-state NMR spectroscopy ({sup 27}Al and {sup 29}Si MAS), infrared spectroscopy; chemical analysis, water and nitrogen adsorption, X-ray diffraction, X-ray photoelectron spectroscopy, and {sup 129}Xe NMR spectroscopy of adsorbed xenon. Use of HZSM-5 in methanol conversion was found to cause dealumination of the zeolite lattice. The catalyst lifetime, however, increased after repeated use in MTG cycles. The dealumination is caused by water produced during methanol conversion, although the extralattice aluminum species formed appeared to differ from those produced by calcination or mild hydrothermal treatment. The increase in catalyst lifetime is attributed to a decreased rate of coke formation in catalysts containing lower densities of acid sites. 17 refs., 9 figs., 1 tab.
- OSTI ID:
- 471630
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 161; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ADSORPTION
ALKYLATION
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
GASOLINE
HETEROGENEOUS CATALYSIS
METHANOL
NITROGEN
NUCLEAR MAGNETIC RESONANCE
SCANNING ELECTRON MICROSCOPY
SORPTIVE PROPERTIES
WATER
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
ZEOLITES