Novel microporous crystalline material comprising a...

Details Novel microporous crystalline material comprising a... Novel microporous crystalline material comprising a...

B - Operations, Transporting

01

J

B01J 29/85 (2006.01) B01D 53/94 (2006.01)

Patent

CA 2681135

There is disclosed a hydrothermally stable microporous crystalline material comprising a molecular sieve or zeolite having an 8-ring pore opening structure, such as SAPO-34 or aluminosilicate zeolite, able to retain a specific percentage of its surface area and micropore volume after treatment with heat and moisture, such as at least 80% of its surface area and micropore volume after exposure to temperatures of up to 900 0C in the presence of up to 10 volume percent water vapor for a time ranging from 1 to 16 hours. Methods of using the disclosed crystalline material, such as in the SCR of NOx in exhaust gas are also disclosed, as are methods of making such materials.

La présente invention concerne un matériau cristallin microporeux hydrothermiquement stable comprenant un tamis moléculaire ou une zéolithe ayant une structure d'ouverture de 8 pores annulaires, telle que la SAPO-34 ou une zéolithe d'aluminosilicate, capable de retenir un pourcentage spécifique de sa zone de surface et son volume de micropores après un traitement par chaleur et humidité, tel qu'au moins 80 % de sa zone de surface et de son volume de micropores après l'exposition à des températures jusqu'à 900 °C en la présence de jusqu'à 10 pourcent en volume de vapeur d'eau pour une plage de temps de 1 à 16 heures. La présente invention concerne également des procédés consistant à utiliser le matériau cristallin décrit, tel que dans la SCR de NOx dans un gaz d'échappement, tels que des procédés consistant à fabriquer de tels matériaux.

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