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:
Oct. 26, 1982
Filed:
May. 11, 1981
Applicant:
Inventors:
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ; B01J / ;
U.S. Cl.
CPC ...
252467 ; 562535 ;
Abstract
In the production of a composite oxide catalyst containing at least Mo tegether with V and (or) Nb, the catalyst precursor is subjected to a thermal decomposition step in which: (1) the precursor is heated in a heat-exchanger type apparatus in which a first space accommodating the precursor and a second space through which a heating fluid flows are partitioned and separated from each other, the heating of the precursor being accomplished through the partitioning; (2) the thermal decomposition is carried out as an atmosphere gas of an oxygen concentration of 0.05 to 5 percent is caused to flow through the first space; and (3) the maximum temperature reached in the thermal decomposition is 300.degree. to 550.degree. C.