EP0177198A2
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EP
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A method for the preparation of an amorphous metal oxide composite, and amorphous metal oxide composites, including catalysts, prepared thereby
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1985-09-06
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Granted: —
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Expires: 2005-09-06
Abstract
Abstract @ A method for the preparation of a metal oxide composite, e.g. silica-alumina, having high uniformity and porosity in structure, comprises forming a homogeneous solution of at least two kinds of oxygen-containing organic metal compounds, e.g. metal alkoxides, in a solvent mixture containing a polar compound having multifunctionality or coordinatively crosslinking power, e.g. hexyleneglycol, together with admixture of water to cause cohydrolysis of the oxygen-containing organic metal compounds so that the homogeneous solution is converted into a sol and then into a gelled coagulum followed by drying and heating the coagulum to evaporate the polar compound. The method is applicable to the preparation of a solid catalyst containing a highly dispersed, catalytically active metal as one of the integral components in the metal oxide composite by the admixture of a readily reducible salt of the catalytically active metal to the solution before hydrolysis and heating the gelled coagulum impregnated with the metal salt in a reducing atmosphere to reduce the salt into the metalic form.
Inventors
- 👤 Fujio Mizukami
- 👤 Shuichi Niwa
- 👤 Tohru Tsuchiya
- 👤 Kazuo Shimizu
- 👤 Juichi Imamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 15:04
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/03; B01J37/031; B01J37/033; C; C01; C01B; C01B13/00; C01B13/14; C01B13/32; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/80; C01P2004/82
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
116 words
A method for the preparation of an amorphous metal oxide composite which comprises the steps of: (a) blending at least two kinds of oxygen-containing organic metal compounds in a solvent mixture containing a polar compound having multifunctionality or coordinatively cross linking power at a temperature in the range from 10 to 20 0 0 C to form a homogeneous solution; (b) adding water to the homogeneous solution to cause cohydrolysis of the oxygen-containing organic metal compounds so that the solution is converted into a sol; (c) keeping the sol until the sol is converted into a gelled coagulum; (d) drying the gelled coagulum: and (e) removing the polar compound remaining in the dried gel by evaporation.
Claim 2
Independent Claim
116 words
A method for the preparation of an amorphous metal oxide composite which comprises the steps of: (a) blending at least two kinds of oxygen-containing organic metal compounds in a solvent mixture containing a polar compound having multifunctionality or coordinatively cross linking power at a temperature in the range from 10 to 20 0 0 C to form a homogeneous solution; (b) adding water to the homogeneous solution to cause cohydrolysis of the oxygen-containing organic metal compounds so that the solution is converted into a sol; (c) keeping the sol until the sol is converted into a gelled coagulum; (d) drying the gelled coagulum: and (e) removing the polar compound remaining in the dried gel by evaporation.
Claim 3
Dependent Claim
30 words
A method as claimed in claim 1 wherein the oxygen-containing organic metal compounds are selected from alkoxides. ketoalcohol compounds, diketone compounds. ketocarboxylic acid compounds and hydroxycarboxylic acid compounds of metals.
Claim 4
Dependent Claim
35 words
A method as claimed in claim 2 wherein the alkoxides, ketoalcohol compounds, diketone compounds, ketocarboxylic acid compounds and hydroxycarboxylic acid compounds are formed in situ in the solvent mixture from salts of metals convertible thereinto.
Claim 5
Independent Claim
33 words
A method as claimed in any one of the preceding claims wherein the oxygen-containing organic metal compounds include at least one selected from oxygen-containing organic compounds of boron, aluminum, silicon, titanium, and zirconium.
Claim 6
Dependent Claim
48 words
A method as claimed in claim 4 wherein the amount of the organic compound of boron, aluminum, silicon, titanium or zirconium in the oxygen-containing organic metal compounds is sufficient to give at least 25% by weight of an oxide of the element in the final metal oxide composite.
Claim 7
Independent Claim
36 words
A method as claimed in any one of the preceding claims wherein the polar compound having multifunctionality or coordinatively crosslinking power is selected from dihydric alcohols, aminoalcohols, ketoalcohols, diketones, ketocarboxylic acids, hydroxycarboxylic acids and dicarboxylic acids.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 6 wherein the dihydric alcohol is a diol compound having 14 or less carbon atoms in a molecule.
Claim 9
Independent Claim
36 words
A method as claimed in any one of the preceding claims wherein the molar ratio of the amounts of the polar compound to the oxygen-containing metal organic compounds is in the range from 0.01 to 15.
Claim 10
Dependent Claim
19 words
A method as claimed in claim 8 wherein the molar ratio is in the range from 0.1 to 5.
Claim 11
Independent Claim
26 words
A method as claimed in any one of the preceding claims wherein the temperature in the step (a) is in the range from 20 to 150°C.
Claim 12
Independent Claim
38 words
A method as claimed in any one of the preceding claims wherein the amount of water added in the step (b) is in the range from 0.5 to 20 moles per mole of the oxygen-containing organic metal compounds.
Claim 13
Dependent Claim
21 words
A method as claimed in claim 11 wherein the amount of water is in the range from 1 to 10 moles.
Claim 14
Dependent Claim
140 words
A method as claimed in claim 1 for the preparation of a porous, high-dispersion metal-containing catalyst which comprises the steps of: (a) blending at least two kinds of oxygen-containing organic metal compounds and a readily reducible metal salt in a solvent mixture containing a polar compound having multi-functionality or coordinatively crosslinking power at a temperature in the range from 10 to 200 0 C to form a homogeneous solution; (b) adding water to the homogeneous solution to cause cohydrolysis of the oxygen-containing organic metal compounds so that the solution is converted into a sol; (c) keeping the sol until the sol is converted into a gelled coagulum impregnated with the readily reducible metal salt; (d) drying the gelled coagulum; and (e) heating the dried gel in a reducing atmosphere to reduce the readily reducible metal salt into a metallic form.
Claim 15
Dependent Claim
40 words
A method as claimed in claim 13 wherein the readily reducible metal salt is a salt of a metal selected from copper, silver, gold. iron. cobalt, nickel, rhodium, palladium, ruthenium, platinum, iridium, osmium, chromium, tungsten, molybdenum, manganese, rhenium and zinc.
Claim 16
Dependent Claim
39 words
A method as claimed in claim 13 or claim 14 wherein the amount of the readily reducible metal salt is in the range from 0.01 to 10% by moles based on the amount of the oxygen-containing organic metal compounds.
Claim 17
Independent Claim
30 words
A method as claimed in any one of claims 13 to 15 wherein the temperature in the step (e) is in the range from 200 to 1000 0 C .
Claim 18
Independent Claim
27 words
A method as claimed in any one of claims 13 to 16 wherein the reducing atmosphere is an atmosphere of hydrogen gas or a hydrogen-containing gaseous mixture.
Claim 19
Dependent Claim
20 words
An amorphous metal oxide composite whenever prepared by a method as claimed in any one of claims 1 to 12.
Claim 20
Dependent Claim
17 words
A catalyst whenever prepared by the method as claimed in any one of claims 13 to 17.
References Cited (Backward Citations)
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