| 摘要 |
A novel activated multimetallic catalytic composite useful for converting hydrocarbons comprises a combination of a catalytically effective amount of a pyrolyzed rhodium carbonyl component with a porous carrier material containing a uniform dispersion of a catalytically effective amount of a platinum group component which is maintained in the elemental metallic state. In a highly preferred embodiment, this novel catalytic composite also contains a catalytically effective amount of a halogen component. The platinum group component, pyrolyzed rhodium carbonyl component and optional halogen component are preferably present in the multimetallic catalytic composite in amounts, calculated on an elemental basis, corresponding to about 0.01 to about 2 wt. % of the uniformly dispersed platinum group metal, about 0.01 to about 2 wt. % of carbonyl-derived rhodium and about 0.1 to about 3.5 wt. % of halogen. A key feature associated with the preparation of the subject catalytic composite is reaction of a rhodium carbonyl complex with a porous carrier material containing a uniform dispersion of a platinum group metal maintained in the elemental state, whereby the interaction of the rhodium moiety with the platinum group moiety is maximized due to the platinophilic (i.e. platinum-seeking) propensities of the carbon monoxide ligand used in the rhodium reagent.
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