Evidence for a precursor to decomposition for phosphine adsorption on Rh/Al sub 2 O sub 3 surfaces

Journal Article · Thu Jul 26 00:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100378a004· OSTI ID:6331809

Lu, Guangquan; Crowell, J E ^[1]

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1. Univ. of California, San Diego, La Jolla (USA)

Transmission infrared spectroscopy has been used to detect formation of the species PH{sub 2} and PH upon PH{sub 3} adsorption and decomposition on Al{sub 2}O{sub 3}-supported Rh surfaces. In addition, a unique bonding configuration of PH{sub 3} has been identified that is a precursor to this decomposition process. The precursor state displays a v(PH{sub 3}) vibration that is shifted considerably to lower wavenumbers with respect to the chemisorbed state due presumably to two-center bonding. The population of the precursor state is a sensitive function of temperature, exposed surface metal sites, and surface pretreatment, and precedes the initial phosphine decomposition. The P-H stretching vibration characteristic of this precursor state is quite distinct from that of physisorbed PH{sub 3}, chemisorbed PH{sub 3}, or the partial decomposition fragments, PH{sub 2} and PH.

• OSTI ID: 6331809
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:15; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CATALYSTS
CHEMICAL REACTIONS
COMPLEXES
DATA
DATA ANALYSIS
DECOMPOSITION
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
PHOSPHINES
PHOSPHORUS COMPOUNDS
RHODIUM COMPLEXES
SURFACE PROPERTIES
TRANSITION ELEMENT COMPLEXES