Claims
- 1. 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 from 0.01 and up to 20; a is 0.2-10; b is 0-20; c is 0-1; t is 0-20; the ratio (a+b+c+t): (1+m) is 0.01-6; wherein x is determined by the oxidation state of other elements; A includes at least 0.2 atoms of W per atom of V, the antimony has an average valency higher than +3 and the vanadium has an average valency lower than +5, and wherein said support for the catalyst of formula (1) is selected from silica-alumina and alumina having 20-100 weight percent alumina; silica-titania and titania having 20-100 weight percent titania; silica-zirconia and zirconia having 80-100 weight percent zirconia; and silica-niobia and niobia having 30-100 weight percent niobia (Nb.sub.2 O.sub.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:
- Fe.sub.10 Sb.sub.d Te.sub.e Me.sub.f GgQ.sub.h R.sub.i O.sub.xformula ( 2)
- where
- Me is V, Mo, W or a combination of these;
- G is one or more alkali metals;
- Q is one or more of Cu, Mg, Zn, La, Ce, Cr, Mn, Co, Ni, Bi, Sn;
- R is one or more of P, B and
- d=10-60, e=0-10, f=0-6, g=0-5, h=0-10, i=0-5, and x is a number determined by the valence requirements of the other elements present, and 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.
- 2. A mixture of claim 1 wherein A includes at least 0.4 atoms of W per atom of V.
- 3. A mixture of claim 2 wherein A includes a least 0.4 atoms of P per atom of V.
- 4. A mixture of any one of claims 1, 2 and 3 wherein m is 2-10.
- 5. A mixture of any one of claims 1, 2 and 3 wherein said diluent/support in said first catalyst composition comprises 20-100 weight percent alumina and 80 to zero weight percent silica.
- 6. A mixture of claim 5 wherein said diluent/support in said first catalyst composition comprises 50-100 weight percent alumina and 50 to zero weight percent silica.
Parent Case Info
This is a division of application Ser. No. 642,260, filed Aug. 20, 1984, now U.S. Pat. No. 4,637,976.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3988359 |
Saito et al. |
Oct 1976 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
1336136 |
Nov 1973 |
GBX |