Effect of zeolite protons on palladium-catalyzed hydrocarbon reactions

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(90)90157-F· OSTI ID:6352304

Homeyer, S T; Karpinski, Z; Sachtler, W M.H. ^[1]

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

Catalytic superactivity of electron-deficient palladium for neopentane conversion, previously reported for Pd/Al{sub 2}O{sub 3}, has been verified for Pd/NaHY. The reaction rate, per accessible Pd atom, correlates with the proton content of the catalysts; for samples that contain all the protons generated during H{sub 2} reduction of Pd, it is two orders of magnitude higher than that for Pd/SiO{sub 2}. Samples prepared by reduction of Pd(NH{sub 3}){sub 2}{sup 2+} NaY display an intermediate activity. It is suggested that Pd-proton adducts are highly active sites in neopentane conversion. With methylcyclopentane as a catalytic probe, all Pd/NaHY samples deactivate rapidly and coke is deposited. Temperature-programmed oxidation reveals two types of coke, one of which correlates with the proton concentration in the catalyst. 41 refs.

• OSTI ID: 6352304
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 123:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
2-2-DIMETHYLPROPANE
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL REACTIONS
COKE
CONTROL
CYCLOALKANES
DEACTIVATION
DEPOSITION
ELEMENTS
HYDROCARBONS
HYDROGEN
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PERFORMANCE
PLATINUM METALS
REDUCTION
REFORMER PROCESSES
TEMPERATURE CONTROL
TRANSITION ELEMENTS
ZEOLITES