US4148713A
Expired / Lapsed
US
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ZSM-5 particle containing aluminum-free shells on its surface
Assignee: Mobil Oil AS
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Filing: 1978-01-09
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Granted: 1979-04-10
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Expires: 1998-01-09
Abstract
Abstract Aluminosilicate zeolites are prepared containing an outer aluminum-free shell. The outer shell is essentially SiO2 that has crystallized on the zeolite surface in the ZSM-5 type configuration, leading to a more selective catalyst.
Inventors
- 👤 Louis D. Rollmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:25
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2876; B01J2229/00; B01J2229/30; B01J2229/36; B01J29/65; B01J29/70; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70; Y; Y10; Y10S; Y10S423/00; Y10S423/22; Y10S423/29; Y10S502/00; Y10S502/52
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
41 words
A process for converting a hydrocarbon charge under hydrocarbon conversion conditions by passing said hydrocarbon charge over crystalline aluminosilicate zeolite particles having an aluminum-free outer shell of SiO 2 , said outer shell having the same crystal structure as said zeolite.
Claim 2
Dependent Claim
41 words
A process for converting a hydrocarbon charge under hydrocarbon conversion conditions by passing said hydrocarbon charge over crystalline aluminosilicate zeolite particles having an aluminum-free outer shell of SiO 2 , said outer shell having the same crystal structure as said zeolite.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein said zeolite has a constraint index of from 1 to 12.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the said zeolite has the crystal structure of ZSM-5, ZSM-11, ZSM-12 or ZSM-35.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein the zeolite has the crystal structure of ZSM-5.
Claim 6
Dependent Claim
14 words
The process of claim 3 wherein the zeolite has the crystal structure of ZSM-11.
Claim 7
Dependent Claim
14 words
The process of claim 3 wherein the zeolite has the crystal structure of ZSM-12.
Claim 8
Dependent Claim
14 words
The process of claim 3 wherein the zeolite has the crystal structure of ZSM-35.
Claim 9
Dependent Claim
80 words
A process for converting a hydrocarbon charge under hydrocarbon conversion conditions by passing said hydrocarbon charge over a composition comprising crystalline aluminosilicate zeolite particles having an aluminum-free outer shell of SiO 2 , said zeolite being made by a two stage method comprising: (1) initiating crystallization in a crystallization medium to produce the zeolite and (2) altering the crystallization medium to substantially eliminate the aluminum therein said outer shell of SiO 2 having the same crystal structure as said zeolite.
Claim 10
Dependent Claim
80 words
A process for converting a hydrocarbon charge under hydrocarbon conversion conditions by passing said hydrocarbon charge over a composition comprising crystalline aluminosilicate zeolite particles having an aluminum-free outer shell of SiO 2 , said zeolite being made by a two stage method comprising: (1) initiating crystallization in a crystallization medium to produce the zeolite and (2) altering the crystallization medium to substantially eliminate the aluminum therein said outer shell of SiO 2 having the same crystal structure as said zeolite.
Claim 11
Dependent Claim
19 words
The process of claim 8 wherein the reaction mixture comprises sources of organic cation, silica, alumina and sodium oxide.
Claim 12
Dependent Claim
14 words
The process of claim 9 wherein one source of sodium oxide is sodium hydroxide.
Claim 13
Dependent Claim
23 words
The process of claim 9 wherein in step (2) the organic ion to SiO 2 ratio is reduced from that in step (1).
Claim 14
Dependent Claim
18 words
The process of claim 10 wherein in step (2) the hydroxide is increased from that in step (1).
Claim 15
Dependent Claim
17 words
The process of claim 8 wherein the zeolite has a constraint index of from 1 to 12.
Claim 16
Dependent Claim
21 words
The process of claim 8 wherein the zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12 ZSM-21 and ZSM-35.
Claim 17
Dependent Claim
72 words
The process of claim 8 wherein the reaction mixture to produce the SiO 2 outer shell, exclusive of added solid crystals, has the following composition, in terms of mole ratios of oxides: R/siO 2 =0.01-0.10 SiO 2 /Al 2 O 3 =300-5000 H 2 o/oh -= 20-500 oh-/siO 2 =0.05-1.0 M 2 o/siO 2 =0.1-2 wherein R is an organic ion and M is a mixture of alkali metal and organic cations.
Claim 18
Dependent Claim
73 words
The process of claim 15 wherein ZSM-5 is coated with SiO 2 and wherein the reaction mixture to yield the coat of SiO 2 , exclusive of added ZSM-5, has oxide ratios as follows: R/siO 2 =0.02 SiO 2/Al 2 O 3 =>1000 H 2 o/oh - =150 oh - /siO 2 =0.30 M 2 o/siO 2 =0.28 wherein M is a mixture of alkali metal and tetrapropylammonium cations and R is tetrapropylammonium.
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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |