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:
May. 11, 1976
Filed:
Oct. 07, 1974
Applicant:
Inventors:
Hussain El-Ghatta, Chur, Grisons, CH;
Johann Karl Forrer, Domat-ems, Grisons, CH;
Assignee:
Inventa AG fur Forschung und Patentverwertung, Zurich, CH;
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; B01J / ;
U.S. Cl.
CPC ...
423387 ; 252472 ;
Abstract
A process is disclosed whereby an improved platinum metal-containing catalyst is prepared. Standard platinum metal catalysts are treated with sulfur compounds which liberate sulfurous acid in acid media. The sulfur compounds contain 15 to 150 atom % of sulfur based on the platinum metal present. The treatment is conducted in the presence of hydroxylammonium salts in acid media and in the absence of reducing agents which are capable of reducing sulfurous acid to sulfide.