Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – And group viii containing
Patent
1988-10-21
1990-03-27
Dees, Carl F.
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
And group viii containing
502 66, B01J 2912, B01J 2922, B01J 2932
Patent
active
049120727
ABSTRACT:
The present invention involves processes for producing zeolite catalyst with an exclusively internal surface platinum coating. In one embodiment, the process of the present invention comprises initially equilibrating zeolite (preferably in powder form) with an organic solution (e.g., dichloromethane) of a neutral organo-platinum compound preferably platinum acetylacetonate. The equilibrated zeolite is then washed to remove externally associated organo-platinum compound. In the preferred procedure here, the solvent is then removed from the washed zeolite. Next, organo-platinum compound contained in the washed zeolite is decomposed, preferably by heating to between about 200.degree. C. and about 300.degree. C. Finally, internally-contained decomposed organo-platinum compound is reduced, preferably by hydrogenolysis, to produce zeolite with an exclusively internal surface platinum coating.
Another process for producing internally platinized zeolite catalyst is also part of the present invention. This process comprises initially incubating an aqueous mixture comprising a cationic platinum complex and zeolite powder. A preferred cationic platinum complex is cis-diaquodiammine platinum, although others of analogous structure and properties should be functional. Following separation of the incubated zeolite from the mixture, the zeolite is reacted with a tetraalkylammonium or tetraalkylphosphonium salt. The tetraalkylammonium or tetraalkylphosphonium salt is preferably a halide salt, most preferably tetrabutylammonium bromide. After removing unreacted tetraalkylammonium or tetraalkylphosphonium salt from the zeolite, residual cationic platinum complex in the zeolite is decomposed, preferably by photolysis. Internally contained decomposed platinum complex is then reduced, to produce zeolite with an exclusively internal surface platinum coating.
REFERENCES:
patent: 3013987 (1961-12-01), Castor et al.
patent: 3200083 (1965-08-01), Milton
patent: 3226339 (1965-12-01), Frilette et al.
patent: 3236762 (1966-02-01), Rabo et al.
patent: 3267076 (1966-08-01), Ishii et al.
patent: 3314895 (1967-04-01), Munns, Jr.
patent: 3862994 (1975-01-01), Yates
patent: 4547472 (1985-10-01), Nordstrant et al.
patent: 4595668 (1986-06-01), Poppelmeier et al.
Zeolite Chemistry and Catalysis by Rabo, ACS Monograph 171, Washington, D.C., 1976 (Minachev et al-Metal-Zeolite Catalysts, pp. 555-559 & 562-565.
Felthouse et al., Zeolite-Encapsulated Platinum Catalysts: Preparation, Characterization by Transmission Electron Microscopy and Their Shape Selective Behavior Toward Various Nitrogen Base Poisons During the Catalytic Oxidation of Aqueous Formaldehyde, Journal of Catalysts, vol. 98, 1983, 411-433.
Persaud et al., Photochemical Hydrogen Evolution via Singlet-State Electron-Transfer Quenching of Zinc Tetra (N-methyl-4-pyridyl) Porphyrin Cations in a Zeolite L Based System, Journal of the American Cancer Society, vol. 109, No. 24, 1987, pp. 7309-7314.
Mallouk Thomas E.
Persaud Lalchan
Dees Carl F.
Gas Research Institute
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