Catalytic mixtures for ammoxidation of paraffins
AssigneeThe Standard Oil Company
InventorsLinda C. Glaeser, James F. Brazdil
Life of this patent
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Abstract
Ammoxidation of C.sub.3 to C.sub.5 acyclic alkanes with NH.sub.3 and O.sub.2 using (1) a mole ratio of alkane:NH.sub.3 in the range from 2 to 16 and a mole ratio of alkane:O.sub.2 in the range 1 to 10 and (2) a mixture of particulate catalyst compositions, the first being especially effective to promote formation of an unsaturated nitrile and an olefin from the paraffin, and the second catalyst composition being especially effective to promote the conversion of the olefin to the unsaturated nitrile. Catalytic compositions useful in the process are disclosed.
Claims9
A catalytic mixture suitable for the ammoxidation of propane to acrylonitrile, which comprises an intimate particulate mixture of a first catalyst composition and a second catalyst composition, said first catalyst composition being 10-99 weight percent of a diluent/support and 90-1 weight percent of a catalyst having the components in the proportions indicated by the empirical formula:
- VSb.sub.m A.sub.a B.sub.b C.sub.c T.sub.t O.sub.x, formula (1)
- where
- A is one or more of W, Sn, Mo, B, P and Ge;
- B is one or more of Fe, Co, Ni, Cr, Pb, Mn, Zn, Se, Te, Ga, In and As;
- C is one or more of an alkali metal and Tl;
- T is one or more of Ca, Sr and Ba;
- and
- where m is greater than 1 and up to 20;
- a is 0-10;
- b is 0-20;
- c is 0-1;
- t is 0-20;
- a is equal to or less than m;
- b is equal to or less than m;
- t is equal to or less than m;
- wherein x is determined by the oxidation state of other elements, and wherein the antimony has an average valency higher than +3 and the vanadium has an average valency lower than +5,
- said second catalyst composition being 0-99 weight percent of a diluent/support and 100-1 weight percent of a catalyst having the components in the proportions indicated by the empirical formula:
- Bi.sub.n Ce.sub.p D.sub.d E.sub.e F.sub.f Mo.sub.12 W.sub.g O.sub.y formula ( 2)
- where
- D is one or more of Fe, Mn, Pb, Co, Ni, Cu, Sn, P, Cr, Y, Mg, Ca, Sr, Ba and rare earths other than Ce and Sm
- E is one or more of Sb, Ge, As, Se, Te and V
- F is one or more of an alkali metal, Tl, Ag and Sm and where n is 0.01-24, p is 0.01-24, (n+p) is 0.1-24, d is 0-10, e is 0-10, f is 0-6, g is 0-8, y is determined by the oxidation state of other elements, wherein the weight ratio in said mixture of said first catalyst composition to said second catalyst composition is in the range of 0.001 to 2.5.
Dependencies are inferred from the claim text.