Catalyst for aromatization of light hydrocarbons

Details Catalyst for aromatization of light hydrocarbons Catalyst for aromatization of light hydrocarbons

1991-01-16

1992-06-23

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

502 69, 502 77, 502 78, 502 79, B01J 2306, B01J 2906, B01J 3708

Patent

active

051242931

ABSTRACT:
The present invention concerns a catalyst suited to the aromatization reaction of light hydrocarbons. Such a heterogeneous catalyst contains zinc bound to a zeolite support material. The catalyst in accordance with the invention is prepared by adsorbing the zinc onto the surface of the zeolite support material directly from the vapor phase by way of chemisorption. The zeolite compound acting thus as the support material is here heated to a temperature which is above the condensation temperature of the zinc vapor. Advantageously, the preparation has been carried out at temperatures above 390.degree. C. The zinc vapor has been brought to contact the zeolite support material, whereby the vapor pressure of zinc is maintained sufficiently high and the duration of its interaction with the support material sufficiently long so as to provide at least one equal amount of or, preferably, an excess of zinc in relation to the available binding sites of the support material. In order to avoid the desorption of absorbed zinc, temperature in the preparation reaction of the catalyst in accordance with the invention has been maintained below 550.degree. C.

REFERENCES:
patent: 3013984 (1961-12-01), Breck
patent: 3013986 (1961-12-01), Castor
patent: 3013989 (1961-12-01), Freeman, Jr.
B. Delmon and G. F. Froment (Editors), Catalyst Deactivation 1987, pp. 639-650.
Journal of Catalysis 114, 284-290 (1988).

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