Chemisorption and thermal decomposition of ethylene on a Pd(110)(1 times 2)-Cs surface: Electron energy loss spectroscopy and thermal desorption studies

Journal Article · Thu Aug 23 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100380a056· OSTI ID:6352167

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

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1. Kyoto Univ. (Japan)

The adsorbed state of ethylene on the Pd(110)(1{times}2)-Cs surface and its thermal decomposition have been studied by the use of high-resolution electron energy loss spectroscopy and thermal desorption spectroscopy. For a small exposure (0.1 Langmuir) at 90 K, ethylene is {pi}-bonded to the Pd(110)(1{times}2)-Cs surface. For a large exposure (2 Langmuirs), a small amount of physisorbed ethylene exists in addition to {pi}-bonded ethylene. The saturation coverage corresponds to 0.23 C{sub 2}H{sub 4} molecules per Pd atom of the unreconstructed Pd(110) surface. The physisorbed ethylene is desorbed by heating to 110 K. A part of the {pi}-bonded ethylene is desorbed intact at 200 K, and additionally at 270 K by a recombinative process. By heating to 300 K, the residual C{sub 2}H{sub 4} admolecules are decomposed, and methylidyne (CH) species are formed. Only carbon adatoms remain on the Pd(110)(1{times}2)-Cs surface by heating to 500 K. These results are compared with those for the Pd(110) clean surface, and the effects of Cs adatoms on the surface reactions are discussed.

• OSTI ID: 6352167
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:17; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKALI METALS
ALKENES
CESIUM
CHEMICAL BONDS
CHEMICAL REACTIONS
CHEMISORPTION
DECOMPOSITION
DESORPTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY-LOSS SPECTROSCOPY
ETHYLENE
HYDROCARBONS
LOW TEMPERATURE
MEDIUM TEMPERATURE
METALS
ORGANIC COMPOUNDS
PALLADIUM
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS