Interaction of cyclohexadiene with Pt(111) studied by BPTDS and HREELS

Journal Article · Thu Jul 09 04:00:00 EDT 1992 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100193a060· OSTI ID:273609

Hugenschmidt, M B; Diaz, A L; Campbell, C T ^[1]

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1. Univ. of Washington, Seattle, WA (United States)

The interactions of 1,3- and 1,4-cyclohexadiene with Pt(111) have been studied with bismuth postdosing thermal desorption mass spectroscopy (BPTDS) and high-resolution electron energy loss spectroscopy (HREELS). Both species adsorb molecularly on Pt(111) at 100 K. Upon warming, both species dehydrogenate completely to produce adsorbed benzene. The reaction occurs at about 230-260 K with an activation energy of 14 {plus_minus} 2 kcal/mol. The adsorbed benzene thus produced either dehydrogenates, ultimately to graphitic carbon, or desorbs, both occuring above 450 K. When cyclohexadiene is coadsorbed with hydrogen adatoms, no significant amounts of hydrogenated products (<2%) are observed in normal TDS or in BPTDS. 19 refs., 5 figs.

• Sponsoring Organization: USDOE
• OSTI ID: 273609
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 14 Vol. 96; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
10 SYNTHETIC FUELS
40 CHEMISTRY
ACTIVATION ENERGY
ADSORPTION
CATALYTIC EFFECTS
CYCLOALKENES
DEHYDROGENATION
PLATINUM
SORPTIVE PROPERTIES