Chemisorption and thermal decomposition of acetylene on Pd(110): Electron energy loss spectroscopy and thermal desorption studies

Journal Article · Thu May 17 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100373a071· OSTI ID:6378968

Yoshinobu, J; Sekitani, T; Onchi, M; Nishijima, M ^[1]

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1. Kyoto Univ. (Japan)

The adsorbed states of acetylene on Pd(110) at 90 K and its thermal decomposition in the temperature region up to 700 K have been investigated by using high-resolution electron energy loss spectroscopy and multiplexed thermal desorption spectroscopy. For a small exposure (0.5 langmuir) at 90 K, acetylene is chemisorbed molecularly in a single state (disorderedly) and it located in the {mu}{sub 2}-site with its C-C bond axis inclined to the surface plane; one of the CH groups is hydrogen-bonded to the surface and gives the softened CH stretching vibration. Upon heating to 180 K, acetylene (C{sub 2}H{sub 2}) is dissociated into ethynyl (CCH) species and H adatoms. For a large exposure (5 langmuirs) at 90 K, acetylene is adsorbed in several states. A part of the C{sub 2}H{sub 2} admolecules are desorbed intact at 100 K. Upon heating to 200 K, the rest are mainly dissociated into CCH species and H adatoms. The C{sub 2}H{sub 4} and {beta}-H{sub 2} desorptions occur at 265 and 320 K, respectively.

• OSTI ID: 6378968
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:10; 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
ACETYLENE
ALKYNES
CHEMICAL REACTIONS
CHEMISORPTION
DATA
DATA ANALYSIS
DECOMPOSITION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY-LOSS SPECTROSCOPY
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PALLADIUM
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
THERMAL ANALYSIS
TRANSITION ELEMENTS