Catalysts for ammonia synthesis

Details Catalysts for ammonia synthesis Catalysts for ammonia synthesis

C - Chemistry, Metallurgy

01

C

C01C 1/04 (2006.01) B01J 21/18 (2006.01) B01J 23/46 (2006.01) B01J 23/58 (2006.01) B01J 35/10 (2006.01) B01J 35/00 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2468909

We claim catalysts for ammonia synthesis based on ruthenium, directly supported over graphite having BET specific surface area in excess of 10 m2/g, preferably in excess of 100 m2/g and more preferably in excess of 280 m2/g, said graphite being characterised by X-ray diffraction pattern containing the diffraction lines characteristic of the crystalline graphite only, with exclusion of relevant bands due to amorphous carbon, to which catalysts barium, caesium and potassium are added as promoters. The graphitic supports allow to avoid the known pre-treatments and post-treatments needed in the case of supports obtained by partial graphitisation of active carbons and during use they are affected negligibly by the methanation shown by the supports obtained from active carbons. Furthermore, the catalysts of the present invention are characterised by a very high activity, even with ruthenium loadings well below the known loading.

La présente invention concerne des catalyseurs pour la synthèse de l'ammoniac, à base de ruthénium, supporté directement sur du graphite d'une surface spécifique BET dépassant 10 m?2¿/g, de dépassant préférence 100 m?2¿/g, et encore mieux, dépassant 280 m?2¿/g. Ce graphite est caractérisé par un diagramme de diffraction aux rayons X contenant des lignes de diffraction caractéristiques uniquement du graphite cristallin à l'exclusion des bandes correspondantes imputables au carbone amorphe. On peut ajouter comme promoteurs à ces catalyseurs du baryum, du césium et du potassium. Ces supports graphiteux permettent d'éviter les traitements a priori et a posteriori indispensables dans le cas de supports obtenus par graphitisation partielle des carbones actifs. En outre, pendant l'utilisation ils ne sont affectés que de façon négligeable par méthanation dont font preuve les supports obtenus à partir des carbones actifs. Enfin, les catalyseurs de l'invention sont caractérisés par une activité très haute, même avec des charges de ruthénium bien en dessous de la charge connue.

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