Method of manufacturing a crystalline silica/platinum...

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B01J 31/06 (2006.01) B01J 23/42 (2006.01) B01J 29/035 (2006.01) B01J 31/28 (2006.01) B01J 33/00 (2006.01) C01B 4/00 (2006.01)

Patent

CA 1200540

TITLE A METHOD OF MANUFACTURING A CRYSTALLINE SILICA/PLATINUM CATALYST STRUCTURE INVENTORS Sieghard E. Wanke Huseni A. Rangwala Fred D. Otto iVO G. Dalla Lana Linda M. Paterson John H. Rolston ABSTRACT OF THE DISCLOSURE A crystalline silica, platinum catalyst structure is provided by soaking a hydrophobic, high surface area, crystalline silica (SiO2) lattice essentially free of aluminum oxide in the SiO2 lattice, such as silicalite, in an aqueous solution of Pt (NH3)4 C12 and then, drying, reducing and cooling the crystalline silica to leave catalyst crystallites of platinum on the crystalline silica and in the pores thereof, and then providing an outer, porous, membrane coating of high molecular weight, organic, polytetrafluoro- ethylene polymeric material on the coated crystallites. The platinized, crystalline silica may be slurried with the polytetra- fluoroethylene and a ceramic support coated with the slurry, so that a water repellent, water vapour and hydrogen or oxygen gas permeable, polytetrafluoroethylene matrix is provided on the support with the platinized, crystalline silica dispersed in the matrix. The catalyst has a high platinum content and high platinum dispersion and is particularly useful for hydrogen isotope exchange between liquid water and gaseous hydrogen or for such exothermic reactions as combining hydrogen and oxygen.

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