Hydrocarbon synthesis from CO and H.sub.2 using Rh supported on

Details Hydrocarbon synthesis from CO and H.sub.2 using Rh supported on Hydrocarbon synthesis from CO and H.sub.2 using Rh supported on

1977-07-28

1978-09-26

Mars, Howard T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252460, 252466PT, C07C 104

Patent

active

041169948

ABSTRACT:
A new method for the selective synthesis of olefinic hydrocarbons of from C.sub.2 -C.sub.5 from CO and H.sub.2 which method comprises the steps of passing a synthesis gas stream of CO and H.sub.2 at a H.sub.2 /CO ratio of from 0.1-10 at a space velocity of from 100 hr..sup.-1 to 50,000 hr..sup.-1 over a catalyst system comprising from 0.01 to 10 wt. % rhodium deposited on TiO.sub.2, other titanium-containing oxides or mixtures of said titanium-containing oxides for a time sufficient to effect the generation of desired olefinic products, at a temperature of from 100.degree.-500.degree. C. and a pressure of from 100 to 10.sup.5 kPa. The supported rhodium catalyst has a surface area of from 10 to 60 m.sup.2 g.sup.-1 of total catalyst with a preferred rhodium crystallite size .ltoreq. 5 nm.
Rhodium supported on TiO.sub.2, other titanium-containing oxides, or mixtures of titanium oxides results in a catalyst system which exhibits superior hydrocarbon synthesis characteristics. Such supported rhodium catalysts exhibit selectivity to olefinic products of from 2 to 5 carbons inclusive in processes for olefin generation accompanied by greater product yields and exhibit improved longevity, tolerance to sulfur and activity maintenance.

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Eidus et al., Izvestia Akad Nauk SSSR, Ser Khim No. 7 (pp. 1160-1169) Translation pp. 1129-1135, Jul. 1965.
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Pichler, Brenn. Chem., 19, pp. 226-230, 1938.
Shultz et al., Report of Investigations 6974, Bureau of Mines 1967, pp. 1-3, 5-14, 18.

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