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:
Jun. 26, 1984
Filed:
Mar. 25, 1983
Philip H Harju, Spring Church, PA (US);
Eugene A Pasek, Export, PA (US);
Koppers Company, Inc., Pittsburgh, PA (US);
Abstract
Catalytic material is prepared by impregnating porous silica with an aqueous solution containing vanadyl oxalate (VOC.sub.2 O.sub.4), potassium sulfate (K.sub.2 SO.sub.4) and potassium bisulfate (KHSO.sub.4). A free-flowing dry-appearing powder is provided comprising particles having substantially all compounds deposited from the impregnating solution attached to the silica particles within pores of the particles. Subsequent calcining of the powder provides a mixture of compounds within the particle pores containing at least one oxide of vanadium and at least one sulfate of potassium. Catalytic material prepared by the disclosed process is characterized in having a substantially uniform concentration of deposited compounds within the pores of the silica support. The catalytic material is particularly useful in a process for fluid bed oxidation of naphthalene to phthalic anhydride, in which oxidation process the catalyst provides high product yield at a low catalyst attrition rate.