Hydrocarbon conversion with a sulfided acidic multimetallic cata

Details Hydrocarbon conversion with a sulfided acidic multimetallic cata Hydrocarbon conversion with a sulfided acidic multimetallic cata

1976-11-22

1978-05-23

Davis, C.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Reforming

208111, 252439, 252441, 260673, 26068368, C07C 3508

Patent

active

040909522

ABSTRACT:
Hydrocarbons are converted by contacting them at hydrocarbon conversion conditions with a sulfided acidic multimetallic catalytic composite comprising a combination of catalytically effective amounts of a platinum or palladium component, a rhodium component, a germanium component, a halogen component, and a sulfur component with a porous carrier material. The platinum or palladium, rhodium, germanium, halogen, and sulfur components are present in the multimetallic catalyst in amounts respectively, calculated on an elemental basis, corresponding to about 0.01 to about 2 wt. % platinum or palladium metal, about 0.01 to about 2 wt. % rhodium, about 0.01 to about 5 wt. % germanium, about 0.1 to about 3.5 wt. % halogen, and about 0.01 to about 1 wt. % sulfur. Moreover, the metallic components are uniformly dispersed throughout the porous carrier material in carefully controlled oxidation states such that substantially all of the platinum or palladium and rhodium components are present therein in a sulfided state or in a mixture of the sulfided state and the elemental metallic state and such that substantially all of the germanium component is present therein in an oxidation state above that of the elemental metal -- typically, as germanium oxide. The sulfiding of the catalytic composite is performed prior to any contact of the composite with hydrocarbon and after substantially all of the platinum or palladium and rhodium components have been reduced to the elemental metallic state by treatment with a sulfiding gas at conditions selected to incorporate about 0.01 to about 1 wt. % sulfur. The resulting sulfided and selectively prereduced catalyst has the capability of diminishing undesired demethylation and other hydrogenolysis reactions during initial operation of the process and markedly increasing the overall stability of the process.

REFERENCES:
patent: 3567656 (1971-03-01), Mitsche
patent: 3660309 (1972-05-01), Hayes et al.
patent: 3898154 (1975-08-01), Rausch
patent: 3933622 (1976-01-01), Mitchell et al.
patent: 3960709 (1976-06-01), Hayes
patent: 3986948 (1976-10-01), Rausch

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