Catalytic microporous zirconia particulates
Patent 5380691 Issued on January 10, 1995. Estimated Expiration Date: 
June 12, 2012. 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.
June 12, 2012. 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 References 3132110 Vapor phase nitration catalysts Process for the preparation of cerium oxide particulates Porous amorphous metallo phosphates process for preparing porous amorphous metallo phosphates High stability porous zirconium oxide spherules Novel ceric oxides and preparation thereof Patent #: 5064628 InventorAssigneeApplicationNo. 897755 filed on 06/12/1992US Classes:502/170, With metal carboxylate or metal compound and carboxylic acid or anhydride502/171, Organic compound contains metal (e.g., Na-O-Ethyl, etc.)502/174, Inorganic carbon containing502/201, Nitrate502/208, Phosphorus or compound containing same502/217, Sulfate502/348And Group III metal containing (i.e., Sc, Y, Al, Ga, In or Tl)ExaminersPrimary: Sneed, Helen M. S.Assistant: McGinty, Douglas J. Attorney, Agent or FirmForeign Patent References
International ClassesB01J 027/053B01J 027/18 B01J 027/232 B01J 027/25 B01J 031/38 B01J 037/30 B01J 021/06 Foreign Application Priority Data1989-05-10 FRAbstractHighly microporous zirconia particulates having pore sizes of an average diameter of less than 20 Å (2 nm), well adapted as catalysts and catalyst supports, are prepared by thermohydrolyzing a zirconium salt, separating the resulting precipitate from the medium of thermohydrolysis and then calcining such precipitate, and wherein an anion more covalent than the hydroxyl anion, e.g., a nitrate, sulfate, phosphate or carboxylate, is incorporated into such precipitate upstream of the calcination thereof.Other References
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