Sulfur-resistant carbon-supported iridium catalysts: Cyclohexane dehydrogenation and benzene hydrogenation

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90047-L· OSTI ID:6994192

Rodriguez-Ramos, I ^[1]; Guerrero-Ruiz, A ^[2]

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1. Campus Univ. Autonoma, Madrid (Spain)
2. UNED, Madrid (Spain)

Carbon-supported iridium catalysts, with different metal loadings, were prepared by impregnation of a high-purity activated carbon. The dispersion of the metallic phase was studied by hydrogen and carbon monoxide chemisorption and transmission electron microscopy (TEM). The hydrogen chemisorption on the iridium crystallites supported on activated carbon was quite different from the chemisorption on an Ir/alumina catalyst. TEM observations of the catalysts show metal particles as spheres in the former case and as rafts in the latter. The cyclohexane dehydrogenation and the benzene hydrogenation were studied for both catalyst types. Both reactions are insensitive to the iridium dispersion and to the support. The thiotolerance level of the cyclohexane dehydrogenation, the thiotolerance level is affected neither by the support (activated carbon versus alumina) not by the metallic dispersion of the Ir/carbon catalysts. However, in the benzene hydrogenation the carbon-supported iridium catalysts are more resistant toward the poisoning than the Ir/alumina counterpart. This behavior is interpreted as due to the different metallic microstructures produced on the two supports.

• OSTI ID: 6994192
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 135:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ACTIVATED CARBON
ADSORBENTS
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BENZENE
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMISORPTION
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
CYCLOALKANES
CYCLOHEXANE
DEHYDROGENATION
ELECTRON MICROSCOPY
ELEMENTS
EVALUATION
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN
HYDROGENATION
IMPREGNATION
IRIDIUM
METALS
MICROSCOPY
MICROSTRUCTURE
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POISONING
SEPARATION PROCESSES
SORPTION
SULFUR
SYNTHESIS
THIOPHENE
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY