Hydration and etherification of propene over H-ZSM-5. 2. Deposition of carbonaceous compounds on the catalysts

The hydration and etherification of propene over H-ZSM-5 are accompanied by the deposition of carbonaceous compounds on the catalyst. Analysis of spent samples indicates that the interior of the zeolite becomes inaccessible due to the deposition of carbonaceous compounds resulting from the oligomeri...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 1993-11, Vol.32 (11), p.2512-2515
Main Author: Sonnemans, Max H. W
Format: Article
Language:English
Subjects:
10 SYNTHETIC FUELS
100200 - Synthetic Fuels- Production- (1990-)
ADSORPTION HEAT
ALKENES
CARBONACEOUS MATERIALS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
DEACTIVATION
DEPOSITION
ENTHALPY
ETHERS
HYDRATION
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
MINERALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PROPYLENE
REACTION KINETICS
SILICATE MINERALS
SOLVATION
SYNTHESIS
THERMODYNAMIC PROPERTIES
ZEOLITES
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Summary:The hydration and etherification of propene over H-ZSM-5 are accompanied by the deposition of carbonaceous compounds on the catalyst. Analysis of spent samples indicates that the interior of the zeolite becomes inaccessible due to the deposition of carbonaceous compounds resulting from the oligomerization of propene. The propene hydration and etherification reactions are relatively unaffected by this process, however, from which it is concluded that these reactions proceed mainly on the external surface of the zeolite crystallites. Support for this concept is provided by the findings that the catalytic activity of H-ZSM-5 in these reactions (i) decreases when the crystallite size increases and (ii) is virtually zero when the external surface is passivated by the deposition of a SiO[sub 2] layer.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie00023a012