Reaction pathways for the conversion of methanol and olefins on H-ZSM-5 zeolite

Journal Article · Sun Jun 01 00:00:00 EDT 1980 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(80)90086-X· OSTI ID:6812140

Dejaifve, P ^[1]; Vedrine, J C; Bolis, V; Derouane, E G

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1. Institut de Recherches sur la Catalyse, Villeurbanne, France

The conversions of methanol, dimethyl ether, ethylene, propene, 1-butene, and 3,3-dimethyl-1-butene by reaction on various H-ZSM-5 catalysts at 370 to 380/sup 0/C demonstrate the importance of a carbenium ion mechanism in the formation of various aliphatic (C/sub 1/ to C/sub 6/) and aromatic (C/sub 6/ to C/sub 10/) hydrocarbons. C/sub 2/ to C/sub 4/ olefin reactions occur in a way very similar to the classical conjunct polymerization of olefins. The initial step in the formation of aromatics is a concerted cycloaddition of an olefin and a carbenium ion which is favored by the unique structural properties of the zeolite. From correlations between the Si/Al ratio and yields in aromatics and C/sub 4/ aliphatics, it is proposed that strong acid sites are responsible for the dehydrocyclization of C/sub 6+/ olefins into aromatics. Some evidence is also presented for alkylation reactions. Some of the unique properties of H-ZSM-5 are apparently due to the combination of strongly acidic and molecular sieving properties. 6 figures, 6 tables.

• OSTI ID: 6812140
• Journal Information: J. Catal.; (United States), Vol. 63:2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALKENES
CHEMICAL REACTION KINETICS
METHANOL
ZEOLITES
CATALYTIC EFFECTS
AROMATICS
BUTENES
CARBENES
CATALYSTS
ETHERS
ETHYLENE
HIGH TEMPERATURE
PROPYLENE
ALCOHOLS
HYDROCARBONS
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
MINERALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
RADICALS
REACTION KINETICS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)