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. 11, 1985
Filed:
Feb. 22, 1983
Wilfred P Shum, East Windsor, NJ (US);
John F White, Princeton, NJ (US);
Eva M Beals, Washington Crossing, PA (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
A novel synthetic procedure is disclosed for producing heteropolyacid catalysts having the general formula H.sub.3+x PV.sub.x W.sub.3-x Mo.sub.9 O.sub.40 where 0<x<3. The synthesis of these catalysts requires the formation of a defect structure wherein three of the twelve transition metals which surround the phosphorus hetero atom are missing. Three metal atoms of two other transition metals are then added to the cluster in a separate step by mixing Na.sub.3 H.sub.6 PMo.sub.9 O.sub.34 with the oxides of such transition metals in the presence of hydrochloric acid. A preferred catalyst having the formula H.sub.3.5 PV.sub.0.5 W.sub.2.5 Mo.sub.9 O.sub.40 is also described.