US4190554A
Expired / Lapsed
US
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Method for reactivation of platinum group metal catalyst with aqueous alkaline and/or reducing solutions
Assignee: Osaka Gas Co Ltd
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Filing: 1978-12-26
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Granted: 1980-02-26
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Expires: 1998-12-26
Abstract
Abstract A method for reactivation of a platinum group metal catalyst which comprises treating the platinum group metal catalyst lowered in catalytic activity as the result of having been used for the catalytic reaction of hydrocarbons optionally containing an oxygen atom with at least one agent selected from an inorganic alkaline substance and a reducing substance in an aqueous medium.
Inventors
- 👤 Kiaki Yamauchi
- 👤 Yukihiko Morimoto
- 👤 Toshikatu Sasaki
- 👤 Katsumi Nakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:00
CPC Classifications
C; C10; C10G; C10G47/00; C10G47/02; C10G47/10; C10G47/12; C10G47/14; B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/323; C01B3/326; C01B3/34; C01B3/38; C01B3/386; C01B3/40; B01J38/00; B01J38/48; B01J38/64; C01B2203/00; C01B2203/02; C01B2203/0205; C01B2203/0227; C01B2203/0233; C01B2203/025; C01B2203/0261; C01B2203/10; C01B2203/1041; C01B2203/1047; C01B2203/1064; C01B2203/1082; C01B2203/12; C01B2203/1205; C01B2203/1211; C01B2203/1217; C01B2203/1223; C01B2203/1235; C01B2203/1241; C01B2203/1247; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P20/584; Y10; Y10S; Y10S502/00; Y10S502/515; Y10S502/517; Y10S502/518
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
A method for reactivation of a platinum group metal catalyst which comprises contacting a platinum group metal catalyst lowered in the catalytic activity as the result of having been used for hydro-cracking of hydrocarbons or alkanols with an aqueous solution of an inorganic alkaline compound of alkali metal or alkaline earth metal or mixtures thereof in a concentration of 0.001 to 10 N at a temperature of 5° to 250° C. until the catalytic activity of the catalyst is substantially recovered.
Claim 2
Independent Claim
81 words
A method for reactivation of a platinum group metal catalyst which comprises contacting a platinum group metal catalyst lowered in the catalytic activity as the result of having been used for hydro-cracking of hydrocarbons or alkanols with an aqueous solution of an inorganic alkaline compound of alkali metal or alkaline earth metal or mixtures thereof in a concentration of 0.001 to 10 N at a temperature of 5° to 250° C. until the catalytic activity of the catalyst is substantially recovered.
Claim 3
Dependent Claim
33 words
The method according to claim 1, wherein the inorganic alkaline compound is a member selected from the group consisting of hydroxides, carbonates, nitrates and sulfates of sodium, potassium, calcium, magnesium, barium and stronthium.
Claim 4
Dependent Claim
44 words
The method according to claim 1, followed by treatment with at least one of hydrogen, oxygen and steam at a temperature of 350° to 750° C. under a pressure of 1 to 50 atm. (absolute) until poisonous materials deposited on the catalyst are eliminated.
Claim 5
Dependent Claim
47 words
The method according to claim 1, wherein the catalyst is previously treated with at least one of hydrogen, oxygen and steam at a temperature of 350° to 750° C. under a pressure of 1 to 10 atm. (absolute) until poisonous materials deposited on the catalyst are eliminated.
Claim 6
Dependent Claim
84 words
The method according to claim 1, wherein the catalyst is previously contacted with an aqueous solution of a reducing substance in a concentration of 0.01 to 10% by weight at a temperature of 5° to 250° C. for a period of 3 minutes to 80 hours and then treated with at least one of hydrogen, oxygen and steam at a temperature of 350° to 750° C. under a pressure of 1 to 50 atm. (absolute) until poisonous materials deposited on the catalyst are eliminated.
Claim 7
Independent Claim
71 words
A method for reactivation of a platinum group metal catalyst which comprises contacting a platinum group metal catalyst lowered in the catalytic activity as the result of having been used for hydro-cracking of hydrocarbons or alkanols with an aqueous solution of a reducing substance in a concentration of 0.01 to 10% by weight at a temperature of 5° to 250° C. until the catalytic activity of the catalyst is substantially recovered.
Claim 8
Independent Claim
71 words
A method for reactivation of a platinum group metal catalyst which comprises contacting a platinum group metal catalyst lowered in the catalytic activity as the result of having been used for hydro-cracking of hydrocarbons or alkanols with an aqueous solution of a reducing substance in a concentration of 0.01 to 10% by weight at a temperature of 5° to 250° C. until the catalytic activity of the catalyst is substantially recovered.
Claim 9
Dependent Claim
46 words
The method according to claim 6, wherein the reducing substance is a member selected from the group consisting of hydrazine, formaldehyde, sodium borohydride, lithium aluminum hydride, sodium tartrate, potassium tartrate, sodium potassium tartrate, calcium tartrate, sodium hydrogen tartrate, sodium formate, potassium formate, calcium formate and glucose.
Claim 10
Dependent Claim
44 words
The method according to claim 6, followed by treatment with at least one of hydrogen, oxygen and steam at a temperature of 350° to 750° C. under a pressure of 1 to 50 atm. (absolute) until poisonous materials deposited on the catalyst are eliminated.
Claim 11
Dependent Claim
47 words
The method according to claim 6, wherein the catalyst is previously treated with at least one of hydrogen, oxygen and steam at a temperature of 350° to 750° C. under a pressure of 1 to 50 atm. (absolute) until poisonous materials deposited on the catalyst are eliminated.
Claim 12
Dependent Claim
95 words
The method according to claim 6, wherein the catalyst is previously contacted with an aqueous solution of an inorganic alkaline compound of an alkali metal or alkaline earth metal or mixtures thereof in a concentration of 0.001 to 10 N at a temperature of 5° to 250° C. for a period of 3 minutes to 80 hours and then treated with at least one of hydrogen, oxygen and steam at a temperature of 350° to 750° C. under a pressure of 1 to 50 atm. (absolute) until poisonous materials, deposited on the catalyst are eliminated.
Claim 13
Independent Claim
120 words
A method for reactivation of a platinum group metal catalyst which comprises contacting a platinum group metal catalyst lowered in the catalytic activity as the result of having been used for hydro-cracking of hydrocarbons or alkanols with an aqueous solution or a reducing substance in a concentration of 0.01 to 10% by weight at a temperature of 5° to 250° C. for a period of 3 minutes to 80 hours and then treating the catalyst with an aqueous solution of an inorganic alkaline compound of alkali metal or alkaline earth metal or mixtures thereof in a concentration of 0.001 to 10 N at a temperature of 5° to 240° C. until the catalytic activity of the catalyst is substantially recovered.
Claim 14
Independent Claim
120 words
A method for reactivation of a platinum group metal catalyst which comprises contacting a platinum group metal catalyst lowered in the catalytic activity as the result of having been used for hydro-cracking of hydrocarbons or alkanols with an aqueous solution or a reducing substance in a concentration of 0.01 to 10% by weight at a temperature of 5° to 250° C. for a period of 3 minutes to 80 hours and then treating the catalyst with an aqueous solution of an inorganic alkaline compound of alkali metal or alkaline earth metal or mixtures thereof in a concentration of 0.001 to 10 N at a temperature of 5° to 240° C. until the catalytic activity of the catalyst is substantially recovered.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |