US3696167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst and process for dehydrogenating saturated hydrocarbons
Assignee: Individual
•
Filing: 1970-03-30
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Granted: 1972-10-03
•
Expires: 1990-03-30
Abstract
Abstract For dehydrogenating saturated hydrocarbons, there is provided a substantially neutral catalyst containing (a) alumina, (b) from 0.05 to 2 percent by weight of platinum, (c) from 0.01 to 0.5 percent by weight of at least one additional noble metal from the group consisting of iridium and ruthenium, the latter percentages being given with respect to alumina, wherein the content by weight of the additional noble metal is from 0.05 to 0.3 times the content by weight of platinum and (d) an alkali or alkalineearth metal with a content by weight of from 0.3 to 10 times the overall content of noble metals, the specific surface of the catalyst being 1 to 20 sq. m. per gram and the neutralization heat of the alumina being below 5 calories per gram in the ammonia adsorption test. Of the above catalysts, the best are produced by introducing the alkali or alkaline-earth metal compound after the noble metals are introduced.
Inventors
- 👤 Bernard Juguin
- 👤 Jean Francois Le Page
- 👤 Jean Miquel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/58; B01J35/00; B01J35/60; B01J35/61; B01J35/612; B01J35/613; B01J35/63; B01J35/633; B01J35/635; B01J35/66; B01J21/00; B01J21/02; B01J21/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
29 words
A catalyst as defined by claim 1, said catalyst being produced by impregnating said alumina carrier with said noble metals prior to adding said alkali or alkaline-earth metal compound.
Claim 2
Dependent Claim
12 words
A catalyst according to claim 1, wherein the alumina is alpha alumina.
Claim 3
Dependent Claim
18 words
A catalyst according to claim 1, the pore volume of which is 0.4 to 0.8 ccm per gram.
Claim 4
Dependent Claim
29 words
A catalyst according to claim 4, in which from 70 to 90 percent of the pore volume consists of pores of an average diameter of 1,000 to 4,000 Angstroms.
Claim 5
Dependent Claim
13 words
A catalyst according to claim 1, wherein the additional noble metal is iridium.
Claim 6
Dependent Claim
13 words
A catalyst according to claim 1, wherein the additional noble metal is ruthenium.
Claim 7
Dependent Claim
28 words
A catalyst according to claim 1, wherein the additional noble metal consists of a mixture of iridium and ruthenium in a ratio of 0.1 to 10:1 by weight.
Claim 8
Dependent Claim
21 words
A catalyst according to claim 1, wherein the alkali metal compound or alkaline-earth metal compound is an oxide or a hydroxide.
Claim 9
Dependent Claim
28 words
A catalyst according to claim 1, wherein the content by weight of the additional noble metal is from 0.05 to 0.6 times the content by Weight of platinum.
Claim 10
Dependent Claim
28 words
A catalyst according to claim 1, wherein the content by weight of the additional noble metal is from 0.1 to 0.6 times the content by weight of platinum.
Claim 11
Dependent Claim
28 words
A catalyst according to claim 1, wherein the content by weight of the additional noble metal is from 0.15 to 0.3 times the content by weight of platinum.
Claim 12
Dependent Claim
20 words
A catalyst as defined by claim 1 wherein the neutralization heat of the alumina is below 1.5 calories per gram.
Claim 13
Dependent Claim
37 words
A catalyst as defined by claim 1 wherein the content of the alkali or alkaline earth metal (d) is two to four times the total content of the noble metals (b) and (c) on a weight basis.
Claim 14
Dependent Claim
108 words
A process for manufacturing a catalyst as defined in claim 1, said process comprising admixing alumina with a platinum compound and at least one compound of a metal selected from the group consisting of iridium and ruthenium, adding a basic compound of a metal selected from the group consisting of alkali metals and alkaline-earth metals and heating the resulting composition up to a temperature of 300* to 750*C with the provision that if at least one of the noble metals is used as a halogen-containing compound, the catalytic composition is contacted with ammonia at 300* to 600*C prior to adding said alkali or alkaline earth metal basic compound.
Claim 15
Dependent Claim
20 words
A process according to claim 15, wherein at least one of the noble metals is used as a halogen-containing compound.
Claim 16
Dependent Claim
113 words
A process according to claim 15, wherein alumina is contacted with an aqueous solution of platinum and at least one metal selected from the group consisting of iridium and ruthenium, the resulting composition is dried at 60* to 200*C, heated up to a temperature of 300* to 600*C in an air or nitrogen stream, contacted with an aqueous solution of the alkali or alkaline-earth metal compound, dried at 60* to 200*C, heated in air at 350* to 600*C and reduced with hydrogen at 350* to 600*C for 4 to 20 hours at a hydrogen hourly feed rate of 100 to 1,000 times the catalyst volume, said steps being conducted in the above order.
Claim 17
Dependent Claim
18 words
A process for dehydrogenating saturated hydrocarbons wherein said hydrocarbons are contacted with a catalyst according to claim 1.
Claim 18
Dependent Claim
13 words
The process of claim 18, wherein the catalyst is that of claim 3.
Claim 19
Dependent Claim
13 words
The process of claim 18, wherein the catalyst is that of claim 4.
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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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |