Methylcyclopentane conversion catalysis by zeolite encaged palladium clusters and palladium-proton adducts

Journal Article · Wed May 01 04:00:00 EDT 1991 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90016-W· OSTI ID:5629168

Bai, Xinlai; Sachtler, W M.H. ^[1]

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1. Northwestern Univ., Evanston, Illinois (USA)

The conversion of methylcyclopentane (MCP) has been studied over the prototype catalysts HY, Pd/HY, Pd/NaHY, and proton-free Pd/NaY. Ring opening (RO) of MCP to hexane isomers is catalyzed by Pd{sub n} clusters, but ring enlargement (RE) of MCP to cyclohexane and benzene requires metal site and protons. It is found that catalysts containing Pd and protons, in the same zeolite cavity, are dramatically more active for RE than a physical mixture of HY and proton-free Pd/NaY. As other data indicate that protons and Pd{sub n} clusters inside supercages of zeolite Y form 'electron-deficient' (Pd{sub n}H){sup +} adducts, it is proposed that these adducts expose active sites, where MCP is converted to benzene during one residence of the adsorbed molecule. This novel reaction path compares favorably with the classical 'bifunctional' route which requires shuttling of reaction intermediates between metal and acid sites.

• OSTI ID: 5629168
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 129:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ADDUCTS
ALKANES
AROMATICS
AROMATIZATION
BENZENE
CATALYSTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
CYCLOALKANES
CYCLOHEXANE
DEHYDROGENATION
ELEMENTS
HEXANE
HYDROCARBONS
HYDROGEN
HYDROGENATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOMERIZATION
ISOMERS
KINETICS
MATERIALS
METALS
MICROSTRUCTURE
MINERALS
NONMETALS
ORGANIC COMPOUNDS
PALLADIUM
PLATINUM METALS
REACTION INTERMEDIATES
REACTION KINETICS
REFORMER PROCESSES
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENTS
ZEOLITES