Method for preparing an alumina as a support for a hydrotreating catalyst
Patent 4102821 Issued on July 25, 1978. Estimated Expiration Date: 
May 31, 1997. 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.
May 31, 1997. 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 3032515 3232887 3814683 3876557 Oil hydrodesulfurization with alumina composite catalyst utilizing aluminate and dicarboxylic acid in its preparation Patent #: 4038177 InventorApplicationNo. 05/801878 filed on 05/31/1977US Classes:502/439, MISCELLANEOUS (E.G., CARRIER OR SUPPORT PER SE OR PROCESS OF MAKING, ETC.)208/216PP, With specific porosity or pore volume208/216R, With group VI metal or compound423/626, Utilizing acid423/628, Forming catalyst, sorbent activated, or narrow pore alumina502/327, And Group III metal containing (i.e., Sc, Y, Al, Ga, In or Tl)502/512Carboxylic acid or salt thereof other than formic, acetic, or oxalic acidExaminersPrimary: Shine, W. J.Attorney, Agent or FirmInternational ClassesB01J 21/00 (20060101)B01J 21/04 (20060101) B01J 23/85 (20060101) B01J 23/76 (20060101) B01J 37/02 (20060101) B01J 35/00 (20060101) B01J 35/10 (20060101) B01J 37/00 (20060101) AbstractA method for preparing a hydrotreating catalyst having a controlled pore distribution is disclosed. The method requires adding to the alumina prior to forming from 0.1 to 15% by weight of a water soluble polycarboxylic acid having from 2 - 22 carbon atoms. The resulting formed alumina support after being calcined has a pore volume distribution such that most of the pore volume in pores greater than 200 A in diameter as measured by Mercury penetration porosimitry is substantially eliminated. The pore volume as measured by nitrogen adsorption in the range of between 100 A and 1200 A is reduced. The polycarboxylic acid may be added to the catalyst carrier prior to forming in different ways such as by dissolving the catalytically active metals with the water soluble polycarboxylic acid and then impregnating hydrothermally or by pore volume or by adding a water soluble polycarboxylic acid salt to the hydrous or xero gel after precipitation. |
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