Chemistry of inorganic compounds – Zeolite – With change of synthesized zeolite morphology
Reexamination Certificate
2001-07-06
2003-09-16
Sample, David (Department: 1755)
Chemistry of inorganic compounds
Zeolite
With change of synthesized zeolite morphology
C423S705000, C423S707000, C423SDIG002, C423SDIG002, C502S060000, C502S063000, C502S064000
Reexamination Certificate
active
06620402
ABSTRACT:
The present invention relates to a method of preparing zeolite crystals with a pore system of straight mesopores. Zeolites find widespread use as heterogeneous catalysts. In many applications it is a problem that zeolites only have micropores, since this imposes diffusion limitations on the reaction rate. Several attempts to provide zeolitic crystals with a mesoporous system have been made in the past. One possibility is to lower the crystal size of the zeolite (Madsen C. Jacobsen, C. J. H., Chem.Comm. (1999) (673)) and another possibility is to use mesoporous MCM-41 type materials (e.g. Beck, J. S. et al. J.Am.Chem.Soc. Vol.114 (1992) 10834), both articles of which are incorporated herein by reference. However, MCM-41 type materials only exhibit a strict two-dimensional order and consequently do not posses the same acidity as zeolites with three-dimensional order.
This invention provides a method for preparing zeolite single crystals with a tuneable pore system of straight mesopores through the individual zeolite crystals.
The invention provides also zeolite single crystals and hence catalytic material with straight mesopores prepared according to the method of the invention.
The invention provides furthermore activated catalytic material comprising zeolite single crystals with straight mesopores that have been subjected to dealumination and/or ion-exchange.
REFERENCES:
patent: 4508841 (1985-04-01), Onuma et al.
patent: 5723397 (1998-03-01), Verduijn
patent: 5849258 (1998-12-01), Lujano et al.
patent: 6241960 (2001-06-01), Tops.o slashed.e et al.
patent: 2001/0031241 (2001-10-01), Lacombe et al.
patent: 2002/0192155 (2002-12-01), Sterte et al.
patent: 1002764 (2000-05-01), None
patent: WO-9529751 (1995-11-01), None
patent: WO-9747381 (1997-12-01), None
patent: WO-200000287 (2000-01-01), None
Jacobsen et al., “Mesoporous Zeolite Single Crystals,” J. Am. Chem. Soc., vol. 122, pp. 7116-7117, Jul. 2000.*
Madsen et al., “Nanosized zeolite crystals-convenient control of crystal size distribution by confined space synthesis,” Chem. Commun., pp. 673-674, 1999.*
Holland et al., “Dual Templating of Macroporous Silicates with Zeolitic Frameworks,” J. Am. Chem. Soc., vol. 121, pp. 4308-4309, Apr. 1999.
Dahl Søren
Herbst Konrad
Jacobsen Claus J. H.
Pehrson Søren
Schmidt Iver
Dickstein , Shapiro, Morin & Oshinsky, LLP
Haldor Topsoe A.S
Sample David
LandOfFree
Method of preparing zeolite single crystals with straight... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of preparing zeolite single crystals with straight..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of preparing zeolite single crystals with straight... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3057711