Selective hydrogenation of acetylene over palladium in ultra high vacuum
Under ultra-high-vacuum conditions, precoverage of a palladium(111) surface with hydrogen does not affect either the kinetics or the extent of acetylene uptake at 175 K. The subsequent reactive behavior of the system is however radically altered. Benzene formation is strongly suppressed, the transformation of adsorbed acetylene to another species (..beta..-phase) is enhanced, and the yield of ethylene is increased. Ultraviolet photoelectron spectroscopy (UPS) observation and coverage measurements suggest that the ..beta.. phase consists at least partly of vinylidene, although some ethylidyne may also be present. Experiments with deuterium suggest that vinylidene may be the precursor to ethylene formation; flat-lying acetylene is responsible for benzene production.
- Research Organization:
- Univ. of Wisconsin, Milwaukee
- OSTI ID:
- 5583583
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:14; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201 -- Chemical & Physicochemical Properties
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACETYLENE
ALKYNES
CATALYTIC EFFECTS
CHEMICAL REACTIONS
DATA
DEUTERIUM
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGEN
HYDROGEN ISOTOPES
HYDROGENATION
INFORMATION
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
LOW TEMPERATURE
METALS
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
PALLADIUM
PHOTOELECTRON SPECTROSCOPY
PLATINUM METALS
SORPTIVE PROPERTIES
SPECTROSCOPY
STABLE ISOTOPES
SURFACE PROPERTIES
TRANSITION ELEMENTS
ULTRAHIGH VACUUM