Rhone-poulenc Industries

Jean-Yves Derrien

Laurent Seigneurin

Jean-Claude Daumas

Paul Belon

Francis Van Den Bussche

Mixed oxide active catalysts having the formula:

Preparation of mixed oxide catalysts comprising the oxides of molybdenum

An active oxidation catalyst having the formula:

Preparation of molybdenum/tungsten mixed oxide catalysts

Nitrogen oxides, NO.sub.x, are depleted/removed from oxygen-containing gas streams comprising same, by contacting an admixture of ammonia and such gas streams, at elevated temperatures, with a catalyst which comprises a catalytically active metallic oxide deposited on a porous alumina support, said support comprising a volume of pores having diameters larger than 1000 A in excess of 25 cm.sup.3 /100 g, a volume of pores having diameters larger than 300 A in excess of 40 cm.sup.3 /100 g, a total pore volume of from about 80 cm.sup.3 /100 g to 120 cm.sup.3 /100 g, and a surface area of less than 160 m.sup.2 /g, said catalytically active metallic oxide being an oxide of a metal selected from the group consisting of vanadium, iron and cobalt, and said catalytically active metal oxide comprising from 0.5 to 20% by weight of the catalyst.

Catalyst for removing NO.sub.x from gas streams

A novel catalyst composition is disclosed which comprises a catalytically-active metal oxide component containing the oxides of cobalt, molybdenum, bismuth, and iron corresponding to the empirical formula:

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Bourg-la-Reine, France

Jean-Yves Derrien