Molecular mechanisms in the cyclotrimerization of acetylene to benzene on palladium (111)
Multiplexed temperature programmed reaction measurements have been used to examine mechanistic details of the acetylene ..-->.. benzene reaction on Pd(111). Results obtained from (C/sub 2/H/sub 2/ + C/sub 2/D/sub 2/) experiments are in quantitative accord with a nondissociative reaction pathway; H/D scrambling in the reactants is not of significance, but at higher temperatures some H/D scrambling is observed between product molecules. The effects of surface crowding by unreacted acetylene on the binding and conformation of the benzene product are investigated, and it is shown that all benzene desorption is the result of the same initial reactive events. (C/sub 2/D/sub 2/ + C/sub 6/H/sub 6/) data demonstrate that benzene desorption is not reaction-rate limited, consistent with the above conclusion.
- Research Organization:
- Univ. of Cambridge (England)
- OSTI ID:
- 7247385
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:5; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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100% selective cyclotrimerization of acetylene to benzene on Ag(111)
Related Subjects
400201* -- Chemical & Physicochemical Properties
ACETYLENE
ALKYNES
AROMATICS
BENZENE
CATALYTIC EFFECTS
CHEMICAL REACTIONS
DATA
DESORPTION
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
METALS
MILLER INDICES
NUMERICAL DATA
ORGANIC COMPOUNDS
PALLADIUM
PLATINUM METALS
POLYMERIZATION
TRANSITION ELEMENTS