# US 4,394,251 A · Hydrocarbon conversion with crystalline silicate particle having an aluminum-containing outer shell

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- Number: US 4,394,251 A
- Document ID: US4394251A
- Status: Granted
- Kind: A
- Application number: 06/258,496
- Filed: 1981-04-28
- Granted: 1983-07-19
- Earliest claimed: 1981-04-28
- Assignees: Chevron Research Company
- Inventors: Stephen J. Miller
- Web page: https://patentgrep.com/patent/US4394251A

## CPC

- C10G 11/05: Crystalline alumino-silicates, e.g. molecular sieves
- B01J 29/40: of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- C01B 33/2876: {from a reacting mixture containing an amine or an organic cation, e.g. a quaternary onium cation-ammonium, phosphonium, stibonium}
- C10G 35/095: containing crystalline alumino-silicates, e.g. molecular sieves {(C10G35/065 takes precedence)}
- C10G 49/08: containing crystalline alumino-silicates, e.g. molecular sieves
- B01J 2229/62: in or on other molecular sieves
- Y10S 208/02: Molecular sieve
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Hydrocarbon conversion processes with crystalline silicates surrounded by an alumina containing isostructural shell are claimed.

## Claims

### Claim 1

A hydrocarbon conversion process, comprising contacting, under hydrocarbon conversion conditions, a hydrocarbonaceous feedstock with a particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1 and wherein said particle is prepared by a process comprising:
(1) initiating crystallization in a crystallization medium substantially free of aluminum to produce the intermediate pore size crystalline silicate;
(2) adding a source of aluminum to said crystallization medium; and
(3) crystallizing onto said crystalline silicate the isostructural outer portion which comprises alumina.

### Claim 2 (depends on 1)

The process of claim 1 wherein said crystalline silicate has the X-ray diffraction pattern of ZSM-5.

### Claim 3 (depends on 1)

The process of claim 1 wherein said crystalline silicate has the X-ray diffraction pattern of ZSM-11.

### Claim 4 (depends on 1)

The process of claim 1 wherein said process is hydrocracking.

### Claim 5 (depends on 1)

The process of claim 1 wherein said process is catalytic cracking.

### Claim 6 (depends on 1)

The process of claim 1 wherein said process is reforming.

### Claim 7 (depends on 1)

The process of claim 1 wherein said process is hydroisomerization.

### Claim 8 (depends on 1)

The process of claim 1 wherein said process is olefin isomerization.

### Claim 9 (depends on 1)

The process of claim 1 wherein said process is olefin polymerization.

### Claim 10 (depends on 1)

The process of claim 1 wherein said process is catalytic dewaxing.

### Claim 11 (depends on 1)

The process of claim 1 wherein said process comprises stabilizing lube oil stocks.

### Claim 12

A hydrocarbon conversion process, comprising contacting, under hydrocarbon conversion conditions, a hydrocabonaceous feedstock with a particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1 and wherein said particle is prepared by a process comprising:
(1) crystallizing the intermediate pore size crystalline silicate from a first reaction medium substantially free of aluminum;
(2) removing said crystalline silicate from said first reaction medium;
(3) adding said crystalline silicate to a second reaction medium comprising sources of aluminum, and
(4) crystallizing the isostructural, alumina containing outer layer onto said crystalline silicate.

### Claim 13 (depends on 12)

The process of claim 12, wherein said process is hydrocracking.

### Claim 14 (depends on 12)

The process of claim 12 wherein said particle has the X-ray diffraction pattern of ZSM-5.

### Claim 15 (depends on 12)

The process of claim 12 wherein said particle has the X-ray diffraction pattern of ZSM-11.