The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1992
Filed:
Dec. 19, 1990
Applicant:
Inventor:
Gershon J Davis, White Plains, NY (US);
Assignee:
Akzo N.V., Arnhem, NL;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; C01B / ; C07D / ;
U.S. Cl.
CPC ...
502209 ; 423307 ; 549259 ;
Abstract
Vanadium pentoxide can be reduced to the +4 oxidation state from the +5 state, in the manufacture of vanadium-phosphorus-oxide catalyst precursor, (VO).sub.2 H.sub.4 P.sub.2 O.sub.9, by using phosphoric acid as the reducing agent rather than benzyl alcohol. Use of an alkyl silicate with the phosphoric acid insures the correct crystalline species, (VO).sub.2 H.sub.4 P.sub.2 O.sub.9, as indicated by X-ray diffraction.