A stabilized transition alumina catalyst support from...

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B01J 37/02 (2006.01) B01J 21/04 (2006.01) B01J 23/00 (2006.01) B01J 23/40 (2006.01) B01J 23/44 (2006.01) B01J 23/46 (2006.01) B01J 23/72 (2006.01) B01J 23/74 (2006.01) B01J 23/75 (2006.01) B01J 23/89 (2006.01) B01J 31/00 (2006.01) B01J 37/10 (2006.01) C01F 7/02 (2006.01) C01F 7/44 (2006.01) C07C 1/04 (2006.01) B01J 21/06 (2006.01) B01J 23/02 (2006.01) B01J 23/06 (2006.01) B01J 23/08 (2006.01) B01J 23/10 (2006.01) B01J 23/26 (2006.01) B01J 23/34 (2006.01) B01J 23/70 (2006.01) B01J 35/10 (2006.01)

Patent

CA 2500553

This invention relates to methods for making a stabilized transition alumina of enhanced hydrothermal stability, which include the introduction of at least one structural stabilizer; a steaming step before or after the introduction step, wherein steaming is effective in transforming a transition alumina at least partially to boehmite and/or pseudoboehmite; and a calcining step to create a stabilized transition alumina. The combination of the structural stabilizer and the steaming step is believed to impart high hydrothermal stability to the alumina crystal lattice. Particularly preferred structural stabilizers include boron, cobalt, and zirconium. The stabilized transition alumina is useful as a catalyst support for high water partial pressure environments, and is particularly useful for making a catalyst having improved hydrothermal stability. The invention more specifically discloses Fischer- Tropsch catalysts and processes for the production of hydrocarbons from synthesis gas.

L'invention concerne des procédés pour produire une alumine de transition stabilisée à stabilité hydrothermique améliorée. Les procédés selon l'invention comprennent les étapes suivantes : introduction d'au moins un stabilisant structurel ; vaporisation qui précède ou suit l'étape d'introduction et dans laquelle la vaporisation sert à transformer une alumine de transition au moins partiellement en boehmite ou en pseudoboehmite ; et calcination pour créer une alumine de transition stabilisée. La combinaison du stabilisant structurel et de l'étape de vaporisation confère une stabilité hydrothermique élevée au réseau cristallin d'alumine. Les stabilisants structurels particulièrement préférés sont le bore, le cobalt et le zirconium. L'alumine de transition stabilisée selon l'invention convient comme support catalytique pour des environnements à forte pression partielle d'eau et est particulièrement utile pour conférer une stabilité hydrothermique améliorée à un catalyseur. L'invention concerne plus particulièrement des catalyseurs et des procédés Fischer-Tropsch pour la production d'hydrocarbures à partir de gaz de synthèse.

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