Electrode-modified zeolites: Electrode microstructures contained in and on a heterogeneous catalyst

Journal Article · Thu Jul 13 00:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100351a040· OSTI ID:7197620

Rolison, D R; Hayes, E A; Rudzinski, W E ^[1]

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1. Naval Research Lab., Washington, DC (USA)

Zeolite-supported Pt(O) microstructures sized less than 10 nm are addressed as electrodes using dispersion electrolysis. Modification of a heterogeneous catalyst with ultramicroelectrodes permits exploration of electrode processes in an interphase dominated by the nature of the heterogeneous catalyst and at electrode sizes where bulk metallic properties may not apply. The systems described at Pt supported on zeolite type Y and Pt supported on {gamma}-alumina. The electrolytic response of zeolite-supported Pt in the absence of added electrolyte salt for water or a benzene-water mixture is markedly more effective than that at alumina-supported Pt and is seen to depend on the size of the Pt particles supported on the exterior of the zeolite surface. Both supported systems behave as ultramicroelectrodes in that electrolysis is sustained in their presence under conditions that are strictly Ohmic for the feeder electrodes due to the high resistivity of the medium in the absence of electrolyte salt. X-ray photoelectron spectroscopic measurements confirm the expected low concentration and the metallic form of Pt on the zeolite exterior and indicate the approximate particle size of the supported Pt. A particle size effect for the electrolysis of water was observed for Pt supported on zeolite. The conductivity of a dispersion containing water and zeolite is shown to be greater than that derived from ions generated by zeolite-promoted autoprotolysis of the water. Zeolite, thus, offers a solid-state ionic environment that effectively contributes to the ionic strength of the dispersion without requiring dissolution of an electrolyte salt.

• OSTI ID: 7197620
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 93:14; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELECTRODES
MICROSTRUCTURE
ZEOLITES
CATALYSTS
DATA ANALYSIS
ELECTROLYSIS
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
PLATINUM
CRYSTAL STRUCTURE
DATA
ELEMENTS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LYSIS
MATERIALS
METALS
MINERALS
NUMERICAL DATA
PLATINUM METALS
TRANSITION ELEMENTS
360603* - Materials- Properties
400400 - Electrochemistry