EP0365801A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for producing alumina with high specific surface area
Assignee: Nissan Motor Co Ltd
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Filing: 1989-09-06
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Granted: —
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Expires: 2009-09-06
Abstract
Abstract A process including a step of heating a mixture of aluminium alkoxide and hexylene glycol (2-methyl 2,4-pentanediol). Then, the solution is subjected to hydrolysis and subsequently dried and calcined. During these steps hydrolysis and dehydrating condensation of the alkoxide is controlled by the hexylene glycol. This method is found to be found effective for obtaining alumina having a uniform porous structure with a high specific surface area.
Inventors
- 👤 Fujio Mizukami
- 👤 Kazuyuki Maeda
- 👤 Shuichi Niwa
- 👤 Junichi Mine
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 19:26
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/03; B01J37/031; B01J37/033; B01J21/00; B01J21/02; B01J21/04; C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; C01P; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
62 words
A process of producing alumina comprising of step: adding aluminium alkoxide to hexylene glycol (2-methyl 2,4-pentanediol), and heating at a temperature in a range of 101 o C to 200 o C for forming sol; subsequently performing hydrolysis for forming gel from sol; and drying obtained gel and baking dried gel at a temperature higher than or equal to 750 o C.
Claim 2
Dependent Claim
62 words
A process of producing alumina comprising of step: adding aluminium alkoxide to hexylene glycol (2-methyl 2,4-pentanediol), and heating at a temperature in a range of 101 o C to 200 o C for forming sol; subsequently performing hydrolysis for forming gel from sol; and drying obtained gel and baking dried gel at a temperature higher than or equal to 750 o C.
Claim 3
Dependent Claim
28 words
A process as set forth in claim 1, wherein said hexylene glycol is in amount greater than or equal to 0.5 mol versus 1 mol of aluminium alkoxide.
Claim 4
Dependent Claim
28 words
A process as set forth in claim 2, wherein said hexylene glycol is in amount less than or equal to 5 mol versus 1 mol of aluminium alkoxide.
Claim 5
Dependent Claim
28 words
A process as set forth in claim 3, wherein said hexylene glycol is in amount less than or equal to 3 mol versus 1 mol of aluminium alkoxide.
Claim 6
Dependent Claim
32 words
A process as set forth in claim 1, wherein said hydrolysis process is performed by adding water in amount more than or equal to 0.5 mol versus 1 mol of aluminium alkoxide.
Claim 7
Dependent Claim
32 words
A process as set forth in claim 5, wherein said hydrolysis process is performed by adding water in amount less than or equal to 20 mol versus 1 mol of aluminium alkoxide.
Claim 8
Dependent Claim
26 words
A process as set forth in claim 6, wherein water is added in amount ranging 2 mol to 10 mol versus 1 mol of aluminium alkoxide.
Claim 9
Dependent Claim
29 words
A process as set forth in claim 1 wherein said aluminium alkoxide is selected among aluminium methoxide, aluminium ethoxide, aluminium iso-propoxide, aluminium n-propoxide, aluminium n-butoxide, aluminium sec-butoxide, aluminium tert-butoxide.
Claim 10
Dependent Claim
27 words
A process as set forth in claim 1, which includes step of putting or impregnating said sol onto a support and subsequently perform drying and baking process.
Claim 11
Dependent Claim
81 words
A process of producing alumina coated metal substrate for catalyst, comprising of step: adding aluminium alkoxide to hexylene glycol (2-methyl 2,4-pentanediol), and heating at a temperature in a range of 101 o C to 200 o C for forming sol; subsequently performing hydrolysis for forming gel from sol; putting or impregnating sol onto a metallic support; and drying said sol on said metallic support obtained gel and baking dried gel at a temperature higher than or equal to 750 o C.
Claim 12
Dependent Claim
81 words
A process of producing alumina coated metal substrate for catalyst, comprising of step: adding aluminium alkoxide to hexylene glycol (2-methyl 2,4-pentanediol), and heating at a temperature in a range of 101 o C to 200 o C for forming sol; subsequently performing hydrolysis for forming gel from sol; putting or impregnating sol onto a metallic support; and drying said sol on said metallic support obtained gel and baking dried gel at a temperature higher than or equal to 750 o C.
Claim 13
Dependent Claim
28 words
A process as set forth in claim 10, wherein said hexylene glycol is in amount greater than or equal to 0.5 mol versus 1 mol of aluminium alkoxide.
Claim 14
Dependent Claim
28 words
A process as set forth in claim 11, wherein said hexylene glycol is in amount less than or equal to 5 mol versus 1 mol of aluminium alkoxide.
Claim 15
Dependent Claim
28 words
A process as set forth in claim 12, wherein said hexylene glycol is in amount less than or equal to 3 mol versus 1 mol of aluminium alkoxide.
Claim 16
Dependent Claim
32 words
A process as set forth in claim 10, wherein said hydrolysis process is performed by adding water in amount more than or equal to 0.5 mol versus 1 mol of aluminium alkoxide.
Claim 17
Dependent Claim
32 words
A process as set forth in claim 14, wherein said hydrolysis process is performed by adding water in amount less than or equal to 20 mol versus 1 mol of aluminium alkoxide.
Claim 18
Dependent Claim
26 words
A process as set forth in claim 15, wherein water is added in amount ranging 2 mol to 10 mol versus 1 mol of aluminium alkoxide.
Claim 19
Dependent Claim
29 words
A process as set forth in claim 10, wherein said aluminium alkoxide is selected among aluminium methoxide, aluminium ethoxide, aluminium iso-propoxide, aluminium n-propoxide, aluminium n-butoxide, aluminium sec-butoxide, aluminium tert-butoxide.
References Cited (Backward Citations)
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