On the nature of the active sites for ethylene hydrogenation in metal-free zeolites

Journal Article · Fri Jan 31 23:00:00 EST 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90259-K· OSTI ID:7106420

Kanai, Junichi; Martens, J A; Jacobs, P A ^[1]

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1. Louvain Univ. (Belgium)

The hydrogenation of ethylene has been studied over acid faujasites, mordenite, and ZSM-5 zeolites at reaction temperatures varying between 623 and 723 K and a hydrogen pressure of 1 MPa. The active sites responsible for the hydrogenation of ethylene change from sodium cations to Broensted acid sites when the reaction temperature is increased from 623 K to 723 K. The change of the active sites is reflected in the temperature dependence of the ethane yield. It is suggested that the hydrogenation of ethylene on Broensted acid sites requires only a single site and occurs via a pentacoordinated carbonium ion mechanism. Different behavior of acid sites in various zeolites is attributed to topological differences.

• OSTI ID: 7106420
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 133:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METALS
ALKANES
ALKENES
BROENSTED ACIDS
CATALYSIS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
ETHANE
ETHYLENE
FAUJASITE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGENATION
INORGANIC ACIDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
METALS
MINERALS
MORDENITE
ORGANIC COMPOUNDS
REACTION KINETICS
SILICATE MINERALS
SODIUM
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
ZEOLITES