Method for making pellet type catalyst
Patent 4051072 Issued on September 27, 1977. Estimated Expiration Date: 
September 27, 1994. 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.
September 27, 1994. 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 3467602 3565830 3679605 3856706 3928238 Method for producing catalyst impregnated alumina extrudates Heterogeneous catalyst for oxidation of propylene into propylene oxide in the liquid phase and method for preparing it Patent #: 3957690 InventorsAssigneeApplicationNo. 05/673711 filed on 04/05/1976US Classes:502/323, And Group III metal containing (i.e., Sc, Y, Al, Ga, In or Tl)423/213.2, Utilizing as solid sorbent, catalyst, or reactant a material containing a transition element423/213.5, Group VIII element502/305, Of Group VI (i.e., Cr, Mo, W or Po)502/325, Of Group VIII (i.e., iron or platinum group)502/332, And Group III metal containing (i.e., Sc, Y, Al, Ga, In or Tl)502/345, Of copper502/346, And Group III metal containing (i.e., Sc, Y, Al, Ga, In or Tl)502/353, Of Group V (i.e., V, Nb, Ta, As, Sb or Bi)502/354And Group III metal containing (i.e., Sc, Y, Al, Ga, In or T1)ExaminersPrimary: Shine, W. J.Attorney, Agent or FirmAbstractA method for making improved pellet type catalysts utilizing a support material having relatively high alkali metal content, comprising the steps of grinding the support material to the desired size, forming the pellet into the desired shape and size, calcining the pellet to obtain the desired surface area, soaking the calcined pellet in a dilute acid for a short period of time to form the alkali metal salt of the acid to a controlled depth inward from the surface of the pellet, and impregnating the pellet with the desired catalytically active metallic material after draining the acid wash solution, the depth of penetration of the catalytic material being limited to the depth treated by the acid wash. |
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