Hydrothermally stable metal promoted zeolite beta for nox...

B - Operations – Transporting – 01 – J

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B01J 29/072 (2006.01) B01D 53/86 (2006.01) B01D 53/90 (2006.01) B01J 29/06 (2006.01) B01J 29/14 (2006.01) B01J 29/24 (2006.01) B01J 29/46 (2006.01) B01J 29/56 (2006.01) B01J 29/76 (2006.01)

Patent

CA 2428139

The present invention is directed to a metal-promoted zeolite beta catalyst useful in the selective catalytic reduction of nitrogen oxides with ammonia in which the zeolite beta is pre-treated so as to provide the zeolite with improved hydrothermal stability. The stabilized beta zeolite is provided by incorporating into the zeolite structure non-framework aluminum oxide chains. The aluminum oxide chains can be incorporated into the zeolite structure by a unique steaming regimen or by treatment with rare earth metals, such as cerium. The treatment process is unlike well-known methods of dealuminizing zeolites for the purpose of increasing the silica to alumina ratio. In the present invention, the non-framework aluminum oxide is characterized by FT-IR by a peak at 3781+2 cm-1, which when present, stabilizes the zeolite against further dealumination such as under oxidizing and harsh hydrothermal conditions.

L'invention concerne un catalyseur de zéolite bêta dopée par un métal utilisé dans la réduction catalytique sélective d'oxydes d'azote (NOx) au moyen d'ammoniac dans lequel la zéolite bêta est prétraitée de manière à produire de la zéolite avec une stabilité hydrothermique améliorée. La zéolite bêta stabilisée est produite par introduction de chaînes d'oxyde d'aluminium non structuel dans la structure zéolite. Les chaînes d'oxyde d'aluminium peuvent être introduites dans la structure zéolite par un régime de vapeur unique ou par traitement au moyen de métaux rares, tels que du cérium. Le procédé de traitement est différent des procédés notoires de désaluminination des zéolites afin d'augmenter le rapport silice/alumine. Dans cette invention, l'oxyde d'aluminium non structuel est caractérisé par spectroscopie infrarouge à transformée de Fourier (FT-IR) par une crête à 3781+2 cm?-1¿, qui lorsqu'il est présent, stabilise la zéolite contre une désaluminination plus poussée telle que dans des conditions d'oxydation et des conditions hydrothermiques rudes.

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