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US 4,374,756 AGranted
Vanadium-hydrogen-phosphorus-oxygen catalytic material
AssigneeKoppers Company, Inc.
InventorsPhilip H. Harju, Eugene A. Pasek
Life of this patent
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AssigneeKoppers Company, Inc.
InventorsPhilip H. Harju, Eugene A. Pasek
Estimating the term…
Catalytic material is provided by a composition comprising the elements vanadium, non-water-contained hydrogen, phosphorus and non-water-contained oxygen. The VHPO elements are present in a relatively fixed atomic ratio range, there being more non-water-contained oxygen present than phosphorus by an atomic ratio of greater than five to one. The catalytic material comprises an anhydrous primary component having vanadium of mixed valence, hydrogen, phosphorus and oxygen in an empirical relationship defined by VH.sub.x PO.sub.y, wherein "x" has an average value in a range from about 1.29 to about 1.40, and "y" has an average value in a range from about 5.46 to about 5.55. The anhydrous VHPO catalytic material may also be described by a structural formula (VO).sub.m (VO.sub.2).sub.n H.sub.2n (PO.sub.4).sub.n (P.sub.2 O.sub.7).sub.m/2, wherein m+n=3, "m" has an average value in a range from about 0.90 to about 1.07, and "n" has an average value in a range from about 1.93 to about 2.10. The primary component is mostly amorphous and in its substantially anhydrous form is characterized by a powder X-ray diffraction pattern having broad peaks with CuK.alpha. d-spacings of 4.30, 4.17 and 3.09 A. The catalytic material is prepared by a process comprising the steps of reducing vanadium pentoxide with a reducing agent in an aqueous solution of phosphoric acid, followed by the step of oxidizing a portion of the vanadium species with an oxidizing agent to form a slurry of a precipitate containing vanadium(IV) and vanadium(V) in contact with a water solution containing vanadium(IV).
Catalyst for partial oxidation of hydrocarbons, said catalyst comprising vanadium, non-water-contained hydrogen, phosphorus and non-water-contained oxygen, said vanadium present as a mixture of vanadium of plus 4 valence and vanadium of plus 5 valence, and at least a portion of said phosphorus and said non-water-contained oxygen present in a pyrophosphate group.
A composition of matter comprising a first component substantially devoid of water and having vanadium, non-water contained hydrogen, phosphorus and non-water contained oxygen in accordance with the empirical formula:
A composition of matter comprising vanadium, non-water-contained hydrogen, phosphorus and non-water-contained oxygen, and having water of hydration, in accordance with the empirical formula:
A composition of matter having the structural formula:
The composition of matter of claim 19 further characterized by being substantially devoid of water and having a powder X-ray diffraction pattern, based on the copper K-shell transition spectrum, having major d-spacings of 4.30, 4.17 and 3.09 A.
A composition of matter having the structural formula:
Dependencies are inferred from the claim text.