Ammonia decomposition catalysts

B - Operations – Transporting – 01 – J

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B01J 23/40 (2006.01) B01D 53/58 (2006.01) B01D 53/86 (2006.01) B01J 23/46 (2006.01) B01J 23/64 (2006.01) B01J 29/04 (2006.01) B01J 29/068 (2006.01) B01J 29/076 (2006.01) B01J 29/08 (2006.01) B01J 29/18 (2006.01) B01J 29/70 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2151229

An ammonia decomposition catalyst wherein a first catalyst having a crystalline silicate which is represented by the formula in terms of molar ratio of oxides as dehydrated: (10.8)R2O.[aM2O3.bM'O.cAl2O3].ySiO2, wherein R denotes an alkaline metal ion and/or hydrogen ion, M denotes a VIII group element, rare earth element, titanium, vanadium, chromium, niobium, antimony or gallium, M' denotes magnesium, calcium, strontium or barium, a0, 20>b0, a+c=1, 3000>y>11 or a specific porous material as a carrier and iridium or a noble metal as an active metal is present together with or covered with a second catalyst having at least one element selected from the group consisting of titanium, vanadium, tungsten and molybdenum, if necessary, as well as a method of using the same.

Un catalyseur de décomposition d'ammoniac comporte un premier catalyseur à base de silicate cristallisé de formule (1~0.8)R2O.[aM2O3.bM'O.cAl2O3].ySiO2, basée sur des rapports molaires d'oxydes déshydratés, où R représente un ion métallique alcalin et (ou) un ion hydrogène, M est un élément du groupe VIII, une terre rare, le titane, le vanadium, le chrome, le niobium, l'antimoine ou le gallium, M' est le magnésium, le calcium, le strontium ou le baryum, a~0, 20>b~0, a+c=1, 3000>y>11, ou un matériau poreux spécifique comme vecteur et l'iridium ou un métal précieux comme métal actif sont présents avec ou sous un second catalyseur comportant au moins un élément choisi dans le groupe constitué du titane, du vanadium, du tungstène et du molybdène, si nécessaire; méthode d'utilisation dudit catalyseur.

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