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US 9,802,831 B2Granted
Synthesis of high silica zeolite via interzeolite transformation without OSDAs
AssigneesChevron U.S.A. Inc., The Regents of the University of California
InventorsSarika Goel, Stacey Ian Zones, Enrique Iglesia
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Abstract
Provided is a method for preparing a zeolite having a Si/Al ratio of at least 10 by interzeolite transformation in the absence of an organic structure directing agent. The method is more cost effective and less equipment intensive as it eliminates the costly organic structure directing agent and the waste treatment at the plant.
Claims11
A method of preparing a zeolite having a silica to alumina ratio of at least 10, which comprises:
- a. providing a first zeolite comprising BEA or FAU, and
- b. converting the first zeolite to a second zeolite having a higher framework density than the first zeolite and with the second zeolite having a silica to alumina ratio of at least 10 and comprising a MFI, CHA, STF or MTW zeolite;
- with the conversion conducted in the absence of an organic structure directing agent (OSDA), with the time for the conversion ranging from about 10 to about 80 hours;
- the conversion conducted in a solution having a H2O/SiO2 ratio greater than 50 and a NaOH/SiO2 ratio that ranges from 0.25-1.00, and with seed crystals of the second zeolite added to the first zeolite prior to or during the conversion.
1 more element
Dependencies are inferred from the claim text.