EP0225407A1
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Lanthanum silicate materials, their production and use
Assignee: Council of Scientific and Industrial Research
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Filing: 1985-12-02
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Granted: —
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Expires: 2005-12-02
Abstract
Abstract Lanthanum silicate catalyst composites having, in terms of oxide mole ratios, the composition: 0 - 0.3 M₂O : La₂O₃ : 30-200 SiO₂ in which M is a monovalent cation. Such catalyst composites are made by reacting a lanthanum compound, an alkali metal compound and a silicon compound with a tetraalkyl ammonium salt of the formula: R¹ x R² y N⁺Z in which R¹ and R² are C₂-C₄ alkyl groups, x and y are integers from 1 to 3 such that x + y is 4, and Z is a bromide or hydroxide ion, in an aqueous sulphuric acid medium to form a gel, heating the gel at a temperature of 100°C to 200°C, and filtering, drying and calcining the resulting solid material. These materials are effective catalysts for the conversion of lower alcohols to lower olefins.
Inventors
- 👤 Paul Ratnasamy
- 👤 Suneeta Balvant Kulkarni
- 👤 Arvind Narayan Kotasthane
- 👤 Vasudeo Pandurang Shiralkar
- 👤 Rajeev c/o Dr. Prof. J. Weitkamp Kumar
- 👤 Sooryakant Ganesh Hedge
- 👤 Ikkandath Balakrishnan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 01:16
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; C; C07; C07C; C07C1/00; C07C1/20; C07C2521/00; C07C2521/06; C07C2521/08; C07C2523/00; C07C2523/10; Y; Y02; Y02P; Y02P30/00; Y02P30/20; Y02P30/40
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
33 words
A lanthanum silicate catalyst composite having, in terms of oxide mole ratios, the following composition: 0 - 0.3 M₂O : La₂O₃ : 30 - 200 SiO₂ in which M is a monovalent cation.
Claim 2
Dependent Claim
33 words
A lanthanum silicate catalyst composite having, in terms of oxide mole ratios, the following composition: 0 - 0.3 M₂O : La₂O₃ : 30 - 200 SiO₂ in which M is a monovalent cation.
Claim 3
Dependent Claim
31 words
A lanthanum silicate catalyst composite having, in terms of oxide mole ratios, the following composition: 0 - 0.3 M₂O : La₂O₃ : 90 SiO₂ in which M is a monovalent cation.
Claim 4
Dependent Claim
31 words
A lanthanum silicate catalyst composite having, in terms of oxide mole ratios, the following composition: 0 - 0.3 M₂O : La₂O₃ : 90 SiO₂ in which M is a monovalent cation.
Claim 5
Dependent Claim
19 words
A lanthanum silicate catalyst composite according to claim 1 or 2, in which M is sodium, ammonium or hydrogen.
Claim 6
Dependent Claim
137 words
A process for the preparation of a lanthanum silicate catalyst composite according to any of claims 1 to 3, which comprises reacting a lanthanum compound, an alkali metal compound and a silicon compound with a tetraalkyl ammonium salt of the formula: R¹ x R² y N⁺Z in which R¹ and R², which may be the same or different, are alkyl groups containing from 2 to 4 carbon atoms; x and y, which may be the same or different, are values of from 1 to 3 but with the sum of x and y equal to 4; and Z is a bromide or hydroxide ion, in an aqueous sulphuric acid medium to form a gel, heating the gel so formed at a temperature from 100°C to 200°C and thereafter filtering, drying and calcining the resultant solid composite material.
Claim 7
Dependent Claim
25 words
A process according to claim 4, in which R¹ and R² in the formula R¹ x R² y N⁺Z are methyl, ethyl, propyl or butyl.
Claim 8
Dependent Claim
51 words
A process according to claim 4 or 5, in which, when M in the composition for the composite is sodium, the calcined composite is subjected to ion exchange with an ammonium salt to provide a composite having a molar ratio of sodium oxide to aluminium oxide of from 0.01 to 0.3.
Claim 9
Dependent Claim
41 words
A process according to claim 6, in which the product resulting from said ion exchange is further treated with nitric acid or hydrochloric acid at a temperature of from 30°C to 90°C for a period of from 5 to 10 hours.
Claim 10
Dependent Claim
41 words
A process according to claim 6, in which the ammonium salt is ammonium nitrate or ammonium chloride and the product resulting from the ion exchange is washed to free it of chloride or nitrate ions before being dried and further calcined.
Claim 11
Dependent Claim
30 words
A process according to any of claims 4 to 8, in which the gel is heated to a temperature of from 150°C to 180°C for from 5 to 500 hours.
Claim 12
Dependent Claim
29 words
A process according to any of claims 4 to 9, in which the product resulting from the heating of the gel is washed, dried at approximately 120°C and calcined.
Claim 13
Dependent Claim
36 words
A process according to any of claims 4 to 10, in which the calcination or further calcination is effected at a temperature of from 530°C to 550°C over a period of from 6 to 10 hours.
Claim 14
Dependent Claim
89 words
A process according to any of claims 4 to 11, in which the reactants are reacted in stoichiometric amounts and the product is crystallised hydrothermally to yield a catalyst composite composed of amorphous and/or crystalline lanthanum oxide, silica and lanthanum silicates, the molar ratio of sodium oxide and lanthanum oxide in the lanthanum silicates being from 0.05 to 0.3 and that of silica and lanthanum oxide being from 25 to 200, and the molar ratio of silica to lanthanum oxide in the lanthanum oxide being from 5 to 200.
Claim 15
Dependent Claim
51 words
A process according to any of claims 4 to 12, in which the solid catalyst composite is blended with from 10% to 70% by weight of a binder, the blend is extruded to a desired shape, dried and calcined at a temperature of about 500°C for from 2 to 10 hours.
Claim 16
Dependent Claim
21 words
A process according to claim 13, in which the binder is alumina, silica, acetic acid, bentonite, keolinite, talc, or stearic acid.
Claim 17
Independent Claim
62 words
A method for the conversion of alkanols to light olefins having from 2 to 4 carbon atoms, which comprises contacting one or more alkanols at a temperature of from 300°C to 650°C with a lanthanum silicate catalyst composite according to any of claims 1 to 3 or which has been produced by a process according to any of claims 4 to 14.
Claim 18
Dependent Claim
31 words
A method according to claim 15, in which the alkanol(s) is/are in the form of an aqueous solution or in the vapor phase and the contacting is effected at atmospheric pressure.
Claim 19
Dependent Claim
47 words
A method according to claim 15 or 16, in which the lanthanum silicate catalyst composite is provided within a fixed bed reactor and the aqueous alkanol solution or gaseous alkanol(s) is/are passed over the catalyst bed at a weight hourly space velocity of from 2 to 20.
Claim 20
Independent Claim
24 words
A method according to any of claims 15 to 17, in which the contacting is effected at a temperature of from 300°C to 650°C.
References Cited (Backward Citations)
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