Mineral oils: processes and products – Chemical conversion of hydrocarbons – Reforming
Patent
1978-10-12
1979-09-25
Davis, C.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Reforming
252434, 252439, C10G 3508
Patent
active
041690435
ABSTRACT:
A process for desensitizing a hypersensitive, high activity reforming catalyst for suppression of hydrogenolysis which is particularly acute during the early portion of the period that the catalyst is placed on stream, i.e., at the startup of a reactor. The catalyst is constituted of a composite which includes a Group VIII noble metal hydrogenation-dehydrogenation component, notably platinum, iridium, and selenium. Hydrogenolysis is suppressed by incorporating within such reforming catalyst at the time of its preparation an element, or a compound or salt of selenium. In another of its aspects the present invention embodies a reforming catalyst or catalyst composite comprising a refractory or inorganic oxide support material, particularly alumina, a Group VIII noble metal hydrogenation-dehydrogenation component, notably platinum, to which iridium, and selenium, have been added to promote the activity and selectivity of the catalysts, and said catalyst is prepared by a method wherein selenium is introduced into and deposited throughout said support. Suitably, the reforming catalyst, or composite also contains a halogen component, particularly chlorine and preferably the selenium component is introduced into the support, or catalyst, by impregnating with a solution comprising an element, salt, acid or compound of selenium.
REFERENCES:
patent: 2851399 (1958-09-01), Brennan et al.
patent: 3660271 (1972-05-01), Keith et al.
patent: 3790473 (1974-02-01), Rausch
patent: 3884799 (1975-05-01), Mahoney et al.
patent: 3936369 (1976-02-01), Hayes
Davis C.
Exxon Research & Engineering Co.
Proctor Llewellyn A.
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