Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making
Patent
1998-09-30
2000-08-22
Nguyen, Ngoc-Yen
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Silicon containing or process of making
502 8, 502248, 502255, 502305, 502353, 502504, B01J 2108, B01J 2322, B01J 2328, B01J 208
Patent
active
061072389
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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(Kawasaki Steel Corp.) Abstract 1995 JP 03 229636.
Contractor Rashmikant Maganlal
Letts William Joseph
E. I. Du Pont de Nemours and Company
Nguyen Ngoc-Yen
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