ZSM-5 Containing aluminum-free shells on its surface
Patent 4203869 Issued on May 20, 1980. Estimated Expiration Date: 
December 1, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 1, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCrystalline silicates and method of preparing the same ZSM-5 containing aluminum-free shells on its surface Patent #: 4088605 InventorAssigneeApplicationNo. 05/965656 filed on 12/01/1978US Classes:502/69, Heterogeneous arrangement423/700, ZEOLITE423/713, Isomorphic metal substitution502/71ZSM TypeExaminersPrimary: Dees, Carl F.Attorney, Agent or FirmInternational ClassesB01J 29/00 (20060101)B01J 29/40 (20060101) C07C 6/08 (20060101) C07C 6/00 (20060101) B01J 29/65 (20060101) B01J 29/70 (20060101) AbstractAluminosilicate zeolites are prepared containing an outer aluminum-free shell. The outer shell is essentially SiO2 that has crystallized on the zeolite surface in the ZSM-5 type configuration, leading to a more selective catalyst. |
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