Claims
- 1. A catalytic reaction process for oxidizing S.sup.-- or HS.sup.- in an aqueous solution, which comprises contacting an aqueous solution containing S.sup.-- or HSA.sup.- ions with an oxidative gas in the presence of a catalyst which is solid in the aqueous solution, said solid catalyst consisting essentially of a non-electroconductive, porous carrier of a hydrophobic polymeric material and a catalytic component containing a metal element having a catalytic activity to S.sup.-- or HS.sup.- in the aqueous solution in the presence of the oxidative gas, wherein a water-repellant agent capable of forming a discontinuous film of the aqueous solution on the surface of the solid catalyst is made co-present with the catalytic component so that said oxidative gas is allowed to arrive at active sites of the catalytic component together with the ions to oxidize the ions.
- 2. A catalytic reaction process for precipitating metal ions in an aqueous solution to form a metal from said ions, which comprises contacting a metal ion-containing aqueous solution with a reducing gas in the presence of a solid catalyst that consists essentially of a non-electroconductive, porous carrier of a hydrophobic polymeric material and a catalytic component containing a metal element having a reducing activity for said metal ions, wherein the solid catalyst has water-repellant properties, thereby to reduce the metal ions and to deposit the metal on the surface of said catalyst.
- 3. A catalytic reaction process according to claim 1, characterized in that the oxidative gas is oxygen or an oxygen-containing gas.
- 4. A catalytic reaction process according to claim 2, characterized in that the reducing gas is hydrogen or a hydrogen-containing gas.
- 5. A catalytic reaction process according to claim 2, wherein the catalytic component of the solid catalyst is impregnated within the water-repellent and oil-repellent carrier.
- 6. A catalytic reaction process according to claim 1, wherein said solid catalyst consists essentially of the catalytic component impregnated within the porous carrier of a water-repellant organic polymeric material and a water-repellant agent coated on the solid catalyst.
- 7. A catalytic reaction process according to claim 1, wherein said porous carrier is selected from the group consisting of polytetrafluoroethylene, polyethylene, polypropylene, polystyrene, cross-linked polystyrene and polymethyl methacrylate.
- 8. A catalytic reaction process according to claim 7, wherein said catalytic component is selected from the group consisting of a metal element of groups VIII, V, VIA, IV, IB and IIB.
- 9. A catalytic reaction process according to claim 2, wherein said reducing gas is selected from the group consisting of hydrogen, carbon monoxide, nitrogen monoxide, methane, nitrogen suboxide and a mixture thereof.
- 10. A catalytic reaction process according to claim 2, wherein said porous carrier is selected from the group consisting of polytetrafluoroethylene, polyethylene, polypropylene, polystyrene, cross-linked polystyrene and polymethyl methacrylate.
Priority Claims (6)
Number |
Date |
Country |
Kind |
54-29754 |
Mar 1979 |
JPX |
|
54-29755 |
Mar 1979 |
JPX |
|
54-29756 |
Mar 1979 |
JPX |
|
54-29757 |
Mar 1979 |
JPX |
|
54-29758 |
Mar 1979 |
JPX |
|
54-29759 |
Mar 1979 |
JPX |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
This is a continuation-in-part application of our prior U.S. Application, Ser. No. 347,721, filed Feb. 10, 1982 which, in turn, is a continuation application of prior application, Ser. No. 127,057, filed Mar. 4, 1980, abandoned.
US Referenced Citations (3)
Continuations (1)
|
Number |
Date |
Country |
Parent |
127057 |
Mar 1980 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
347721 |
Feb 1982 |
|