Claims
- 1. A modified molecular sieve produced by a method comprising mixing a calcined and activated zeolite with a sufficient amount of a metal compound to form a solids mixture, heating said solids mixture in a current of inert gas to form a heated solids mixture, cooling said heated solids mixture and subsequently reducing said cooled solids mixture in a current of hydrogen to produce small metal clusters from the cationically introduced metal; wherein said metal compound is a noble metal halide, a noble metal oxide, CuCl.sub.2, or V.sub.2 O.sub.5 ; wherein said zeolite is a small-pored zeolite selected from the group consisting of zeolite ZSM-58, zeolite SAPO-42, zeolite Rho, and zeolite ZK-5; and wherein greater than 60% of the introduced metal is located in the pores and interstices of said small-pored zeolite.
- 2. The modified molecular sieve according to claim 1, wherein said inert gas is helium or nitrogen.
- 3. The modified molecular sieve according to claim 1, wherein said reducing is for 10 to 14 hours at 280.degree. to 350.degree. C.
- 4. The modified molecular sieve according to claim 3, wherein the flow rate of the hydrogen is about 15 cm.sup.3 /min.
- 5. The modified molecular sieve according to claim 1, wherein said heating is at temperatures of 400.degree. to 600.degree. C.
- 6. The modified molecular sieve according to claim 1, wherein said cooling is to room temperature.
- 7. The modified molecular sieve according to claim 1, said method further comprising rinsing with ammonia.
- 8. The modified molecular sieve according to claim 1, said method further comprising as a pretreatment first preparing the Bransted acid form of the zeolite.
- 9. The modified molecular sieve according to claim 1, wherein >70% of the introduced metal is located in the pores and interstices of said small-pored zeolite.
- 10. The modified molecular sieve according to claim 1, wherein said modified molecular sieve is a hydrogenation catalyst.
- 11. The modified molecular sieve according to claim 1, wherein said metal compound is PtCl.sub.2, PdCl.sub.2, or RhCl.sub.2.
- 12. A modified molecular sieve produced by a method consisting essentially of mixing a calcined and activated zeolite with a sufficient amount of a metal compound to form a solids mixture, heating said solids mixture in a current of inert gas to form a heated solids mixture, cooling said heated solids mixture and subsequently reducing said cooled solids mixture in a current of hydrogen to produce small metal clusters from the cationically introduced metal; wherein said metal compound is a noble metal halide, a noble metal oxide, CuCl.sub.2, or V.sub.2 O.sub.5 ; wherein said zeolite is a small-pored zeolite selected from the group consisting of zeolite ZSM-58, zeolite SAPO-42, zeolite Rho, and zeolite ZK-5; and wherein greater than 60% of the introduced metal is located in the pores and interstices of said small-pored zeolite.
- 13. The modified molecular sieve according to claim 12, wherein said metal compound is PtCl.sub.2, PdCl.sub.2, or RhCl.sub.2.
Priority Claims (1)
Number |
Date |
Country |
Kind |
43 04 821.8 |
Feb 1993 |
DEX |
|
Parent Case Info
This is a divisional of application Ser. No. 08/197,481, filed on Feb. 16, 1994, now U.S. Pat. No. 5,434,114.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3375205 |
Wadlinger et al. |
Mar 1968 |
|
3720753 |
Robson |
Mar 1973 |
|
4440871 |
Lok et al. |
Apr 1984 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
197481 |
Feb 1994 |
|