Hydrocarbon conversion with crystalline silicate particle having an aluminum-containing outer shell
AssigneeChevron Research Company
InventorStephen J. Miller
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Abstract
Hydrocarbon conversion processes with crystalline silicates surrounded by an alumina containing isostructural shell are claimed.
Claims15
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.
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.
Dependencies are inferred from the claim text.