Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1991-01-16
1993-02-02
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502300, 502355, B01J 2104, B01J 2302, B01J 2336
Patent
active
051837960
ABSTRACT:
The present invention concerns a heterogenic catalyst suited to the metathesis reactions of hydrocarbons in particular. Such a catalyst includes an inorganic oxide support, typically consisting of .gamma.-alumina, having rhenium oxide absorbed onto its surface. The catalyst in accordance with the invention is prepared by vapourizing a precursor of rhenium, preferably rhenium heptoxide, preferably at a temperature of at least 160.degree. C., and routing the vapour into a reaction chamber where they are brought to interaction with the support material. The temperature of the support material is kept above the condensation temperature of the vapour and simultaneously sufficiently high so as to attain the thermal activation energy level necessary for the generation of bonds between the rhenium oxide and the support material. According to the invention, the process is carried out preferredly within a temperature range of approx. 160.degree. . . . 500.degree. C. The rhenium oxide precursor is introduced in vapour phase in an amount, which is at least equal to or, preferably, in excess of the number of available binding sites on the support material surface. The activity of a catalyst even with a very low content of catalytic metal species is as high as the activity of a catalyst of appreciably higher content of rhenium that has been prepared by the methods of conventional technology.
REFERENCES:
patent: 3644559 (1972-02-01), Kobylinski et al.
patent: 4795734 (1989-01-01), Chauvin et al.
Mouligjn, J. A. et al., J. Molec. Catal. 46, (1988), pp. 1 . . . 14.
Knuuttila Pekka
Lakomaa Eeva-Liisa
Neste Oy
Shine W. J.
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