Catalysts for low temperature selective oxidation of propylene, methods of making and using the same
AssigneeSaudi Basic Industries Corporation
InventorsKhalid Karim, Yajnavalkya Subrai Bhat, Syed Irshad Zaheer, Abdullah Bin Nafisa
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Abstract
A mixed metal oxide catalytic system consisting of molybdenum, vanadium, palladium, lanthanum, niobium and X, wherein X is copper and/or chromium, providing higher yields of acrylic acid and acrolein in the low temperature oxidation of propylene with a molecular oxygen-containing gas without the production of side products such as CO.
Claims48
A catalyst for selective oxidation of propylene to acrylic acid and acrolein containing a catalyst composition comprising the elements Mo, V, La, Pd, Nb, X, and oxygen and having the following formula:
- Mo.sub.a V.sub.b La.sub.c Pd.sub.d Nb.sub.e X.sub.f O.sub.y ;
- wherein X=Cu or Cr or mixtures thereof;
- a is 1;
- b is 0.01 to 0.9;
- c is >0 to 0.2;
- d is 0.0000001 to 0.2;
- e is 0.0000001 to 0.2;
- f is 0.0000001 to 0.2;
- and
- wherein the numerical values of a, b, c, d, e, and f represent the relative gram-atom ratios of the elements Mo, V, La, Pd, Nb, and X, respectively, in the catalyst and y is a number required to satisfy the valence requirements of the elements Mo, V, La, Pd, Nb, and X.
A catalyst for selective oxidation of propylene to acrylic acid and acrolein, said catalyst containing Mo, V, La, Pd, Nb, X, and oxygen, made by a process comprising the steps of:
- a) combining the elements Mo, V, La, Pd, Nb, and X, in the following ratio, to form a mixture:
- MO.sub.a V.sub.b La.sub.c Pd.sub.d Nb.sub.e X.sub.f
- wherein:
- X=Cu or Cr or both;
- a is 1;
- b is 0.01 to 0.9;
- c is >0 to 0.2;
- d is 0.0000001 to 0.2;
- e is 0.0000001 to 0.2;
- and
- f is 0.0000001 to 0.2;
- and
- b) calcining said mixture to form said catalyst containing Mo, V, La, Pd, Nb, X, and oxygen.
A catalyst composition having the following formula:
- Mo.sub.a V.sub.b La.sub.c Pd.sub.d Nb.sub.e X.sub.f O.sub.y ;
- wherein X=Cu or Cr or mixtures thereof;
- a is 1;
- b is 0.01 to 0.9;
- c is >0 to 0.2;
- d is 0.0000001 to 0.2;
- e is 0.0000001 to 0.2;
- and
- f is 0.0000001 to 0.2;
- and
- wherein the numerical values of a, b, c, d, e, and f represent the relative gram-atom ratios of the elements Mo, V, La, Pd, Nb, and X, respectively, in the catalyst and y is a number required to satisfy the valence requirements of the elements Mo, V, La, Pd, Nb, and X.
A catalyst containing Mo, V, La, Pd, Nb, X, and oxygen made by a process comprising the steps of:
- a) forming a mixture consisting essentially of the elements Mo, V, La, Pd, Nb, and X in the following ratio:
- Mo.sub.a V.sub.b La.sub.c Pd.sub.d Nb.sub.e X.sub.f
- wherein:
- X=Cu or Cr or both;
- a is 1;
- b is 0.01 to 0.9;
- c is >0 to 0.2;
- d is 0.0000001 to 0.2;
- e is 0.0000001 to 0.2;
- and
- f is 0.0000001 to 0.2;
- and
- b) calcining said mixture to form said catalyst containing Mo, V, La, Pd, Nb, X, and oxygen.
Dependencies are inferred from the claim text.