Catalyst for the catalytic afterburning of exhaust gases containing carbon monoxide and/or oxidizable organic compounds
First Claim
1. A catalyst for the catalytic afterburning of exhaust gases from phthalic anhydride or maleic anhydride production containing carbon monoxide and/or oxidizable organic compounds in the presence of molecular oxygen containing a) 70-99% by weight, calculated as TiO2, of a titanium dioxide component, b) 1 to 30% by weight, calculated as V2 O5, of a vanadium oxide component selected from the group consisting of vanadium oxides of the formula Vn O2n+1 wherein n has a value of from 2 to 7 or a vanadium compound which converts into a vanadium oxide on heating in air, and c) 0.01 to 0.9% by weight, calculated as noble metal of a noble metal component consisting of one or more compounds of palladium, platinum, and rhodium and said catalyst having a BET-surface area of 10 to 100 m2 /g at an operation temperature of 150°
- -550°
C.
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Abstract
The invention relates to catalysts for the catalytic post-combustion of exhaust gases containing carbon monoxide and/or oxidizable organic compounds and processes for their production. The catalysts contain 70 to 99% wt., calculated as TiO2, of a titanium oxide component, 1 to 30% wt., calculated as V2 O5 of a vanadium oxide component and 0.01 to 0.9% wt., calculated as noble metal, of a noble metal component from one or more nobel metal compounds of nobel metals of the 8th sub-group. The catalysts are characterized by a low starting (≦220° CC.) and operating temperature and their ability to oxidize even slight pollution of the exhaust gas with oxygen-containing or free aliphatic and aromatic hydrocarbons and carbon monoxide in the presence of gases containing molecular oxygen almost quantitatively to the substantially ecologically acceptable products carbon dioxide and water.
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8 Claims
- 1. A catalyst for the catalytic afterburning of exhaust gases from phthalic anhydride or maleic anhydride production containing carbon monoxide and/or oxidizable organic compounds in the presence of molecular oxygen containing a) 70-99% by weight, calculated as TiO2, of a titanium dioxide component, b) 1 to 30% by weight, calculated as V2 O5, of a vanadium oxide component selected from the group consisting of vanadium oxides of the formula Vn O2n+1 wherein n has a value of from 2 to 7 or a vanadium compound which converts into a vanadium oxide on heating in air, and c) 0.01 to 0.9% by weight, calculated as noble metal of a noble metal component consisting of one or more compounds of palladium, platinum, and rhodium and said catalyst having a BET-surface area of 10 to 100 m2 /g at an operation temperature of 150°
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