Societe Chimique De La Grande Paroisse, Azote Et Produits Chimiques

Societe Chimique De La Grande Paroisse

Societe Chimique De La Grande Paroisse, Azote Et Products Chimiques

Yannick Le Goff

Michel Senes

Jacques Quibel

Christian Hamon

Jean-Francois Gourdier

Jean F Gourdier

Gaseous effluents polluted by nitrogen oxides are purified by catalytic reduction. The catalytic compositions used contain iron and chromium associated with alumina and optionally at least a promoter selected from rare earth oxides with a content between 0.1 and 1% in relation to the active material and crude platinum metals with a content between 1 and 5 ppm in relation to the active material, the specific surface of the compositions being between 50 and 300 m.sup.2 /g and the dimensions of the pores between 40 and 50,000 A. These compositions are applicable for processes of purification of nitrogen oxides with any content.

Catalytic composition used in purifying gaseous effluents polluted by

A catalyst for implementing a process for manufacturing amines from alcoh is composed of an active element in the transition metals family uniformly combined with a refractory porous structure with a specific surface of between 10 and 300 m.sup.2 /g and with a pore diameter less than 5000 A. A stabilizer in the form of a sodium-based compound with a sodium content of 0.15 to 20% by weight relative to the weight of the catalyst, and a promoter in the form of a rhodium-based compound with a maximum rhodium content of 0.1% by weight relative to the weight of the catalyst, may be associated with the active metal. The catalyst and the process are applicable to the ethanolamine-ammonia reaction with a view to producing ethylenediamine, piperazine, and useful byproducts.

Catalyst for manufacturing amines from alcohols

The invention relates to the purification of gaseous effluents containing ides of nitrogen by reduction of said oxides in the presence of a catalyst at raised temperatures. The catalysts used in this process contain iron as a major constituent, and may contain chromium or vanadium: these constitute 96 to 99.5% of the weight of the catalyst. Also present as promoters, in a total amount of 4.0 to 0.5% by weight of the catalyst, are one or more rare earth metal oxides and a trace quantity of a platinum metal. The catalyst is prepared by a method which ensures a specific surface of 20-100 m.sup.2 /g and pores having a maximum dimension between 100 and 5000 A. Such a catalyst is particularly suitable for removing residual oxides of nitrogen from the gaseous effluent obtained in the production of nitric acid by the oxidation of ammonia.

Catalyst for the purification of effluent gases containing oxides of

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Saint-Nazaire, France

Yannick Le Goff