US4100262A
Expired / Lapsed
US
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Synthesis of zeolite ZSM-5
Assignee: Mobil Oil AS
•
Filing: 1977-08-15
•
Granted: 1978-07-11
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Expires: 1997-08-15
Abstract
Abstract As synthesized by conventional technique, zeolite ZSM-5 crystals are cubic with some twinning and measure in size over the range of from about 3 x 3 microns to about 8 x 8 microns. By synthesizing crystalline aluminosilicate zeolite ZSM-5 according to the present method, i.e. in the presence of a tetraureacobalt (II) complex and with a specifically defined reaction mixture composition, the crystalline product will consist of highly twinned rectangular prismatic crystals exhibiting extreme uniformity in size of from about 5 x 10 microns to about 10 x 20 microns, depending on the ratio of said tetraureacobalt (II) complex to silica in the zeolite synthesis reaction mixture. Synthesis of ZSM-5 in accordance hereto will provide a zeolite with enhanced catalytic activity for certain chemical reactions.
Inventors
- 👤 Bruce Patrick Pelrine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:48
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/36; C01B39/38; C01B39/40; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C07; C07C; C07C1/00; C07C1/20; C07C6/00; C07C6/08; C07C6/12; C07C6/123; C10; C10G; C10G3/00; C10G3/42; C10G3/44; C10G3/45; C10G3/47; C10G3/48; C10G3/49; B01J2229/00; B01J2229/30; B01J2229/36; B01J2229/40; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C10G2300/00; C10G2300/40; C10G2300/4006; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P30/00; Y02P30/20; Y02P30/40; Y10; Y10S; Y10S423/00; Y10S423/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A method for synthesizing crystalline aluminosilicate zeolite ZSM-5 in a highly twinned, rectangular prismatic crystal form of uniform size which comprises the steps of preparing a reaction mixture containing sources of sodium oxide, tetraalkylammonium oxide, an oxide of aluminum, an oxide of silicon, water and a tetraureacobalt (II) complex and having a composition, in terms of mole ratios of oxides, falling within the following ranges: ______________________________________
SiO.sub.2 /Al.sub.2 O.sub.3
= 5-100
H.sub.2 O/SiO.sub.2
= 0.7-3000
OH.sup.- /SiO.sub.2
= 0.07-10.0
X/SiO.sub.2 = 0.0047-0.047
M/SiO.sub.2 = 0.3-3.0
R/SiO.sub.2 = 0.01-2.0
______________________________________ wherein M is an alkali metal ion and R is a tetraalkylammonium cation, the alkyl groups of which contain 2-5 carbon atoms and X is a tetraureacobalt (II) complex, and maintaining said mixture at a temperature of from about 100° F to about 400° F until crystals of said zeolite are formed.
Claim 2
Independent Claim
141 words
A method for synthesizing crystalline aluminosilicate zeolite ZSM-5 in a highly twinned, rectangular prismatic crystal form of uniform size which comprises the steps of preparing a reaction mixture containing sources of sodium oxide, tetraalkylammonium oxide, an oxide of aluminum, an oxide of silicon, water and a tetraureacobalt (II) complex and having a composition, in terms of mole ratios of oxides, falling within the following ranges: ______________________________________
SiO.sub.2 /Al.sub.2 O.sub.3
= 5-100
H.sub.2 O/SiO.sub.2
= 0.7-3000
OH.sup.- /SiO.sub.2
= 0.07-10.0
X/SiO.sub.2 = 0.0047-0.047
M/SiO.sub.2 = 0.3-3.0
R/SiO.sub.2 = 0.01-2.0
______________________________________ wherein M is an alkali metal ion and R is a tetraalkylammonium cation, the alkyl groups of which contain 2-5 carbon atoms and X is a tetraureacobalt (II) complex, and maintaining said mixture at a temperature of from about 100° F to about 400° F until crystals of said zeolite are formed.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the temperature is maintained between about 180° F and about 350° F.
Claim 4
Dependent Claim
66 words
The method of claim 1 which comprises the further step of replacing, at least in part, the original cations of said zeolite by ion exchange with a cation or a mixture of cations selected from the group consisting of hydrogen and hydrogen precursors, rare earth metals, and metals from Groups IIA, IIIA, IVA, IB, IIB, IIIB, IVB, VIB, and VIII of the Periodic Table of Elements.
Claim 5
Dependent Claim
66 words
The method of claim 2 which comprises the further step of replacing, at least in part, the original cations of said zeolite by ion exchange with a cation or a mixture of cations selected from the group consisting of hydrogen and hydrogen precursors, rare earth metals, and metals from Groups IIA, IIIA, IVA, IB, IIB, IIIB, IVB, VIB, and VIII of the Periodic Table of Elements.
Claim 6
Dependent Claim
26 words
The method of claim 1 which comprises the further step of heating said zeolite to a temperature in the range of 150° F to 1500° F.
Claim 7
Dependent Claim
26 words
The method of claim 2 which comprises the further step of heating said zeolite to a temperature in the range of 150° F to 1500° F.
Claim 8
Dependent Claim
25 words
The method of claim 3 which comprises the further step of heating said zeolite to a temperature of from 150° F to about 600° F.
Claim 9
Dependent Claim
25 words
The method of claim 4 which comprises the further step of heating said zeolite to a temperature of from 150° F to about 600° F.
Claim 10
Dependent Claim
24 words
The method of claim 7 which comprises the further step of calcining said zeolite to a temperature of from 500° F to 1500° F.
Claim 11
Dependent Claim
24 words
The method of claim 8 which comprises the further step of calcining said zeolite to a temperature of from 500° F to 1500° F.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |