Patent · US Expired

Multilayered shell catalysts for catalytic gaseous phase oxidation of aromatic hydrocarbons

US6586361B1 · kind B1 · utility

25Cited by

8References

12Claims

0Family size

Assignee

BASF SE

Inventors

Thomas Heidemann · Viernheim, DE
Stefan Bauer · Ludwigshafen, DE
Gerd Linden · Heidelberg, DE
Hermann Petersen · Burghausen, DE

Key dates

Filing date	Feb 26, 2001
Grant date	Jul 1, 2003
Priority date	—
Expiry date	Feb 26, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/313
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A coated catalyst for the catalytic gas-phase oxidation of aromatic hydrocarbons comprises, on an inert nonporous support, a catalytically active composition comprising a defined amount of vanadium oxide, titanium dioxide, a cesium compound, a phosphorus compound, and antimony oxide, wherein the catalytically active composition is applied in two or more layers and where relative to the inner layer or inner layers the outer layer has an antimony oxide content which is from 50 to 100% lower and wherein the amount of catalytically active composition of the inner layer or layers is from 10 to 90% by weight of the amount of catalytically active composition, and can be used for preparing carboxylic acids and/or anhydrides, in particular phthalic anhydride; also specified is a production process for such catalysts.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.