Title:
【発明の名称】向上した耐摩滅性を示す触媒の製造および使用方法
Document Type and Number:
Japanese Patent JP2002525199
Kind Code:
A
Abstract:
A method for manufacturing of an improved attrition resistant catalyst having an oxide-rich surface layer involving forming a slurry comprising; catalyst, catalyst precursor or catalyst support particles (e.g., transition metal oxides), a colloidal oxide sol (e.g., colloidal silica), and a solution of a solvent and solute wherein the solute consist essentially of a precursor of said oxide-rich surface with particle size no greater than 5 nm (e.g., aqueous silicic acid or polysilicic acid) and then spray drying the slurry to form porous microspheres of attrition resistant catalyst; and, calcining the spray dried microspheres. Such a catalyst is particularly useful in oxidation processes wherein the oxidation is performed by an oxidized form of the catalyst and the resulting reduced form of the catalyst is separately regenerated (e.g., two-step vapor phase processes carried out in recirculating solids reactors, transport bed reactors or circulating fluidized bed reactors and the like).
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Inventors:
Contractor, Rashiyu Mikant Maganral
Letts, William J. Joseph
Letts, William J. Joseph
Application Number:
JP2000572018A
Publication Date:
August 13, 2002
Filing Date:
September 21, 1999
Export Citation:
Assignee:
E.I.DU PONT DE NEMOURS AND COMPANY
International Classes:
B01J23/22; B01J35/00; B01J37/00; C07B41/08; C07B43/08; C07B61/00; (IPC1-7): B01J37/00; B01J23/22; C07B41/08; C07B43/08; C07B61/00
Attorney, Agent or Firm:
Heiyoshi Odashima