EP0044117A2
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Catalyst
Assignee: Dyson Industries Ltd Te Sheffield Groot-Britt
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Filing: 1981-07-13
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Granted: —
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Expires: 2001-07-13
Abstract
Abstract The invention relates to a nickel containing catalyst composition of high thermal stability and which has outstanding resistance to carbon deposition, and is particularly but not exclusively for use in the steam reforming of hydrocarbons. Nickel catalysts formed from coprecipitated materials and homogeneous on a microscopic scale are commonly used for the production of SNG by the low temperature steam reforming of liquid hydrocarbons. Similar materials may be used for the methanation of carbon oxides. These processes require catalysts of high activity at relatively low temperatures. Normally, the thermal stability and other physical parameters such as mechanical strength, and abrasion resistance of such catalysts are of secondary importance. The object of the invention is to provide an improved catalyst, which object is met by a catalyst derived from a precursor of approximate chemical composition where x is not less than 1 and not greater than 4; y is not less than 0.05 and not greater than 1.5 and n is approximately 4.
Inventors
- 👤 Rodney Martin Sambrook
- 👤 Julian Richard Huxham Ross
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 06:31
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/03; B01J23/00; B01J23/70; B01J23/76; B01J23/78; B01J23/83
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
38 words
A catalyst derived from a precursor of approximate chemical composition where x is not less than 1 and not greater than 4; y is not less than 0.05 and not greater than 1.5 and n is approximately 4.
Claim 2
Dependent Claim
38 words
A catalyst derived from a precursor of approximate chemical composition where x is not less than 1 and not greater than 4; y is not less than 0.05 and not greater than 1.5 and n is approximately 4.
Claim 3
Dependent Claim
22 words
A catalyst as in Claim 1, wherein x and y are in the range 1.5 to 3 and 0.1 to 0.5 respectively.
Claim 4
Dependent Claim
19 words
A catalyst as in Claim 1 or Claim 2, wherein parts of the nickel content is replaced by magnesium.
Claim 5
Dependent Claim
32 words
A catalyst as in Claim 3, wherein the catalyst is derived from a precursor of the approximate chemical composition and where z is not less than 0.1 and not greater than 4.
Claim 6
Dependent Claim
22 words
A catalyst as in Claim 4, wherein x and y are in the range 1.5 to 3 and 0.1 to 0.5 respectively.
Claim 7
Dependent Claim
26 words
A catalyst as in any of Claims 1 to 5, wherein in a preparative route based on coprecipitation lanthanum ions are incorporated in a layer structure.
Claim 8
Dependent Claim
26 words
A catalyst as in any of Claims 1 to 6, wherein in the precursor, anions other than carbonate for example nitrates, phosphates etc., are also present.
Claim 9
Dependent Claim
32 words
A method of preparing a catalyst as in Claim 1, comprising co-precipitating the active phase from a solution of nitrates under controlled conditions of pH and temperature, by the addition of alkalis.
Claim 10
Dependent Claim
12 words
A method as in Claim 8, wherein the alkali is ammonium bicarbonate.
Claim 11
Dependent Claim
25 words
A method of preparing a catalyst as in Claim 1, comprising co-precipitating the active phase by a homogeneous precipitation technique using a readily hydrolysable material.
Claim 12
Dependent Claim
12 words
A method as in Claim 10, wherein the hydrolysable material is urea.
Claim 13
Independent Claim
23 words
A method as in any of Claims 8 to 11, wherein after precipitation, the material is filtered, washed and dried at elevated temperatures.
Claim 14
Dependent Claim
21 words
A method as in Claim 12, wherein prior to washing the material is dried at an elevated temperature to remove impurities.
Claim 15
Dependent Claim
31 words
A method as in Claim 12 and Claim 13, wherein the washed and dried material is partially calcined at approximately 300°C prior to forming into a suitable shape for process requirements.
Claim 16
Dependent Claim
26 words
A catalyst as in any of Claims 1 to 7, wherein the lanthanum component is derived from pure lanthanum salts or mixtures of rare earth salts.
Claim 17
Dependent Claim
23 words
A catalyst as in Claim 15, wherein the rare earth salts are lanthanum and cerium mixtures in which lanthanum is the major component.
Claim 18
Dependent Claim
30 words
A catalyst as in Claims 1 to 7 and Claims 15 and 16, wherein nickel is in the range 5 - -30 wt %, and lanthanum 0.1 to 15 wt
Claim 19
Dependent Claim
29 words
A catalyst as in Claims 1 to 7, and 15 to 17, wherein aluminium is present, and the atomic ratio Ni:Al in the active material is 1.5 to 4:1
Claim 20
Dependent Claim
32 words
A catalyst as in Claims 1 to 7 and 15 to 18, wherein magnesium is present in the nickel-aluminium phase, the atomic ratio Ni:Mg in the active material being 1 to 20:1.
Claim 21
Dependent Claim
46 words
A catalyst as in any of Claims 1 to 7 and 15 to 19, wherein the active material is formed in a ceramic matrix having an apparent porosity in the range 15% to 80% and a mean pore diameter in the range 0.1µm to 20 µm.
Claim 22
Dependent Claim
14 words
A catalyst as in Claim 20, wherein the ceramic matrix is a hollow body.
Claim 23
Dependent Claim
32 words
A catalyst as in Claim 20 or Claim 21, wherein the ceramic matrix is pre-treated with alkali or acid to modify the interaction between the catalytically active material and the ceramic matrix.
Claim 24
Dependent Claim
43 words
A catalyst as in any of Claims 20 to 22, wherein the surface of the ceramic matrix is modified by the addition of "spacer/support" material, for example, alumina within the pores of the ceramic matrix prior to the addition of the active phase.
Claim 25
Dependent Claim
54 words
A catalyst as in any of Claims 1 to 7 and 15 to 23, wherein in the preferred preparation of the lanthanum containing catalyst composition for high temperature applications, a preformed α-alumina matrix is impregnated, under vacuum with a solution containing nickel, lanthanum and aluminium nitrates and also a precipitation agent such as urea.
Claim 26
Dependent Claim
26 words
A catalyst as in Claim 24, wherein zirconium is added, preferably as the nitrate, to further increase the stability and/or improve the selectivity of the catalyst.
Claim 27
Dependent Claim
6 words
A catalyst substantially as hereinbefore described.
Claim 28
Dependent Claim
6 words
A catalyst substantially as hereinbefore described.
Claim 29
Dependent Claim
14 words
A method of forming a catalyst as in Claim 1, substantially as hereinbefore described.
References Cited (Backward Citations)
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