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US4568656A
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Process for loading platinum into Zeolite-L
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-12-07
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Granted: 1986-02-04
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Expires: 2004-12-07
Abstract
Abstract A process is provided for loading and uniformly distributing platinum onto a Zeolite-L. The Zeolite-L is contacted with an aqueous solution containing a platinum salt and a non-platinum metal salt, wherein the non-platinum metal salt is present in solution in an amount which is critical to preventing the formation of acid sites as well as avoiding an excess of metal ions in the form of a salt which could block the pores of the Zeolite-L. The Zeolite-L is then aged to allow the platinum to migrate and uniformly distribute throughout the Zeolite.
Inventors
- 👤 Kenneth R. Poeppelmeier
- 👤 Theodore D. Trowbridge
- 👤 Jar-Lin Kao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:38
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/60; B01J29/61; B01J29/62
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
179 words
A process for loading and uniformly distributing platinum onto a Zeolite-L containing exchangeable non-platinum metal cations comprising: contacting the Zeolite-L with an aqueous solution containing a platinum salt and a soluble non-platinum metal salt with the amount of solution being in excess of that which the Zeolite-L can absorb, where the platinum salt contains a platinum cation in the +2 state, and the non-platinum metal salt is initially present in the solution in an amount defined by the formula: ##EQU6## wherein A is the amount of non-platinum metal cations initially present in the solution, A 1 is the amount of a non-platinum metal cation added to the solution by ion-exchange between the platinum cation and the Zeolite-L, Z is the amount of the solution added to the Zeolite-L and X is an amount of a solution which is required to fill the total pore volume of the Zeolite-L to incipient wetness; and aging the Zeolite-L containing the aqueous solution for a time and at a temperature effective to allow the platinum to migrate and uniformly distribute throughout the Zeolite-L.
Claim 2
Dependent Claim
179 words
A process for loading and uniformly distributing platinum onto a Zeolite-L containing exchangeable non-platinum metal cations comprising: contacting the Zeolite-L with an aqueous solution containing a platinum salt and a soluble non-platinum metal salt with the amount of solution being in excess of that which the Zeolite-L can absorb, where the platinum salt contains a platinum cation in the +2 state, and the non-platinum metal salt is initially present in the solution in an amount defined by the formula: ##EQU6## wherein A is the amount of non-platinum metal cations initially present in the solution, A 1 is the amount of a non-platinum metal cation added to the solution by ion-exchange between the platinum cation and the Zeolite-L, Z is the amount of the solution added to the Zeolite-L and X is an amount of a solution which is required to fill the total pore volume of the Zeolite-L to incipient wetness; and aging the Zeolite-L containing the aqueous solution for a time and at a temperature effective to allow the platinum to migrate and uniformly distribute throughout the Zeolite-L.
Claim 3
Dependent Claim
22 words
Process of claim 1 wherein the non-platinum metal salt is initially present in solution in an amount defined by the formula: ##EQU7##
Claim 4
Dependent Claim
33 words
Process of claim 1 wherein the contacting is carried out at temperatures in the range of room temperature to 100° C. and the aqueous solution is at a pH of at least 7.
Claim 5
Dependent Claim
31 words
Process of claim 1 wherein the Zeolite-L prior to loading contains an exchangeable metal cation chosen from the group consisting of lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium and barium.
Claim 6
Dependent Claim
41 words
Process of claim 4 wherein the metal salt contains a cation chosen from the group consisting of lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium and barium, and an anion chosen from the group consisting of chloride, hydroxide, bromide and nitrate.
Claim 7
Dependent Claim
22 words
Process of claim 5 wherein the cation of the metal salt is the same as the exchangeable cation contained in the Zeolite-L.
Claim 8
Dependent Claim
19 words
Process of claim 6 wherein the Zeolite-L contains potassium as the exchangeable cation and the metal cation is potassium.
Claim 9
Dependent Claim
16 words
Process of claim 1 wherein the excess solution is drained and the Zeolite-L is then aged.
Claim 10
Dependent Claim
33 words
Process of claim 1 wherein the platinum salt is chosen from the group consisting of tetraamine platinum (II) chloride monohydrate, tetraamine platinum (II) nitrate, diamine platinum (II) nitrite or dichloro bis(acetonitrile) platinum (II).
Claim 11
Dependent Claim
22 words
Process of claim 1 wherein the amount of platinum is within the range of 0.3 to 1.5% by weight of the Zeolite-L.
Claim 12
Dependent Claim
19 words
Process of claim 1 additionally comprising the steps of slowly drying the Zeolite-L to minimize steaming and platinum agglomeration.
Claim 13
Dependent Claim
10 words
Process of claim 11 further comprising calcining the dried Zeolite-L.
Claim 14
Dependent Claim
16 words
Process of claims 11 or 12 further comprising subsequently reducing the Zeolite-L in a hydrogen atmosphere.
Claim 15
Dependent Claim
14 words
Process of claim 1 wherein the Zeolite-L is in the form of a pellet.
Claim 16
Dependent Claim
12 words
Process of claim 14 wherein the pellet comprises Zeolite-L and a binder.
Claim 17
Dependent Claim
21 words
Process of claim 15 wherein the contacting is carried out with a minimum of agitation to avoid attrition of the pellet.
Claim 18
Dependent Claim
31 words
Process of claim 15 wherein the binder is acidic or has ion exchange capacity and the amount of metal cation in the aqueous solution is adjusted to compensate for this capacity.
Claim 19
Dependent Claim
19 words
Process of claims 2, 15 or 17 wherein the aqueous solution is at a pH between 8.5 and 12.5.
Claim 20
Dependent Claim
21 words
Process of claims 1 or 8 wherein aging is carried out at 25° to 100° C. for 1 to 72 hours.
Claim 21
Dependent Claim
19 words
Process of claim 11 wherein drying is carried out at 50° to 200° C. for 2 to 24 hours.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |