Sulfur promoted oxidative dehydrogenation
AssigneePetro-Tex Chemical Corporation
InventorsLouis J. Croce, Laimonis Bajars
Life of this patent
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Abstract
The yield in oxidative dehydrogenation of organic compounds is improved by having a surfur promoter present either as part of the catalyst or added to the reaction with the reactants.
Claims52
A process for the oxidative dehydrogenation of organic compounds in the presence of an oxygen containing gas, a metal ferrite catalyst, and at least a promoting amount of sulfur.
A process for the dehydrogenation of ethylbenzene to styrene comprising:
- contacting ethylbenzene and SO.sub.2 in the vapor phase under dehydrogenation conditions with a catalyst comprising:
- a ferrite of the spinel form having the formula
- A.sub.a A'.sub.b Fe.sub.c O.sub.4
- where A has a valence of plus 2 and is a metal selected from the group consisting of cobalt, nickel, zinc and magnesium;
- A' has a valence of plus 3 and is selected from the group consisting of chromium and lanthanum;
- a has a value from 0.1 to about 3;
- b has a value from 0 to less than 2;
- c has a value from greater than 0 to about 3;
- and a+b+c has a value of 3;
- or a ferrite of the perovskite form having the formula
- B.sub.d Cr.sub.e Fe.sub.f O.sub.3
- where B has a valence of plus 3 and is selected from lanthanum and yttrium;
- d, e and f are each values from 0.5 to 1.5 and the sum of d, e, and f is 2.
A cyclic process for the dehydrogenation of ethylbenzene to produce styrene which comprises:
- 1. contacting ethylbenzene with SO.sub.2 in the vapor phase under dehydrogenation conditions with a catalyst comprising:
- a ferrite of the spinel form having the formula
- A.sub.a A'.sub.b Fe.sub.c O.sub.4
- where A has a valence of plus 2 and is a metal selected from the group consisting of cobalt, nickel, zinc and magnesium;
- A' is a metal having a valence of plus 3 and is selected from the group consisting of chromium and lanthanum;
- a has a value from 0.1 to about 3;
- b has a value from 0 to less than 2;
- c has a value from greater than 0 to about 3;
- and a+b+c has a value of 3;
- or a ferrite of the perovskite form having the formula
- B.sub.d Cr.sub.e Fe.sub.f O.sub.3
- where B has a valence of plus 3 and is selected from lanthanum and yttrium;
- d, e and f are each values from 0.5 to 1.5 and the sum of d, e and f is 2;
- 2. regenerating said ferrite catalyst with a gas containing free molecular oxygen;
- 3. contacting ethylbenzene and SO.sub.2 in the vapor phase under dehydrogenation conditions with said regenerated ferrite catalyst to obtain substantially the same yields of styrene as were obtained initially.
A process for the dehydrogenation of ethylbenzene to styrene comprising:
- contacting ethylbenzene and SO.sub.2 in the vapor phase under dehydrogenation conditions with a catalyst comprising:
- a ferrite having two elements other than iron and oxygen with said elements being selected from the group consisting of (1) (a) a member selected from the group consisting of cobalt, nickel, zinc and magnesium together with (b) a metal selected from the group consisting of chromium and lanthanum or (2) a member selected from the group consisting of (a) lanthanum and yttrium together with (b) chromium.
A process for the dehydrogenation of ethylbenzene to styrene comprising:
- contacting ethylbenzene and SO.sub.2 in the vapor phase under dehydrogenation conditions with a catalyst comprising:
- a ferrite selected from the group consisting of magnesium chromium ferrite, zinc chromium ferrite, lanthanum chromiun ferrite, nickel chromium ferrite and cobalt chromium ferrite.
Dependencies are inferred from the claim text.