Elf Atochem S.a.

Grande-paroisse S.a.

Transvalor

Grand-paroiesse S.a.

Bernard Neveu

Jean-Bernard Peudpiece

Yvan A Schwob

Marcel Norais

Pierre Ilbizian

Laurent Limousin

Gerard Delahay

Bernard Coq

Patrick Achard

St&eacute;phane Kieger

Francois Fajulas

Zeolites partially exchanged with copper, in particular faujasites, in which the copper does not largely occupy the small cages (for example the sodalite cages of the faujasites), are used as non-nitrogen-protoxide-generating SCR catalysts. Particular attention is drawn to certain mixed rare-earth/copper zeolites. The selectivity of the reduction of NOx to N,is correlated with the TPR diagram of the catalysts.

Process for the removal from gases of nitrogen oxides NOx by selective catalytic reduction (SCR) using ammonia over zeolite catalysts not causing the formation of nitrogen protoxide

The sludge filtration device comprises: a filter (1) placed over an approximately horizontal box (4), this filter (1) constituting, in its filtration position, the bottom of a filter chamber (8) of essentially vertical axis; a piston (10) suitable for closing the filter chamber in the top part; means (3, 11) for causing relative movement between the box (4) provided with the filter (1) and the piston (10) so that a liquid filtrate flows downwards through the filter (1) and so that a cake of solid matter remains on the filter (1) at the end of the operation; and a scraper device (31) provided for removing this cake. The piston is made in the form of a filter piston (10) so that a liquid effluent passes through the filter piston (10) as the volume of the filter chamber (8) is being decreased, and a suction pumping means (P) is provided for removing the effluent above the filter piston (10).

Sludge filtration device comprising a filter piston, and sludge

Process for the production of phospho-nitrogenous products and products

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Puteaux, France

Bernard Neveu