Surface carbonaceous deposits as activity and selectivity influencing species in ring-opening reactions of propylcyclobutane catalyzed by Pt/SiO[sub 2]
- Jozsef Attila Univ., Szeged (Hungary)
Active site formation in the hydrogenative ring opening of propylcyclobutane over Pt/SiO[sub 2] was investigated in a static reactor, mainly at 373 K. Changes in the ring-opening rates and selectivities on variously treated catalyst are described. Three types of treatment were applied: repeated runs with (i) only evacuation or (ii) inter-run reduction (H[sub 2], 473 K, 0.5 h), or (iii) prepoisoning of the catalyst with propylcyclobutane at 373 K or 673 K. The observed (in some cases dramatic) increase in selectivity towards the formation of heptane (1,2 C-C bond scission) is interpreted in terms of the formation of a metal-carbonaceous deposit interface where the deposit provides an anchoring site for the adsorption of the propyl side-chain and the ring opens on the clean Pt atoms. Changes in activity due to the various treatments are also discussed. 19 refs., 2 figs., 2 tabs.
- OSTI ID:
- 7046134
- Journal Information:
- Journal of Catalysis; (United States), Vol. 145:2; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CYCLOALKANES
HYDROGENATION
PLATINUM COMPLEXES
CATALYTIC EFFECTS
CATALYSTS
HETEROGENEOUS CATALYSIS
SILICON OXIDES
ALKANES
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
HYDROCARBONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
TRANSITION ELEMENT COMPLEXES
400201* - Chemical & Physicochemical Properties