Catalyst systems and methods of synthesizing catalyst systems
AssigneeKing Abdullah University of Science and Technology
InventorsLeilei Xu, Jean-Marie Basset, Pradeep Kumar Doggali
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Abstract
Embodiments of catalyst systems and methods of synthesizing catalyst systems are provided. The catalyst system may include a core comprising a zeolite; and a shell comprising a microporous fibrous silica. The shell may be in direct contact with at least a majority of an outer surface of the core. The catalyst system may have a Si/Al molar ratio greater than 5. At least a portion of the shell may have a thickness of from 50 nanometers (nm) to 360 nm.
Claims16
A catalyst system comprising:
- a core comprising a ZSM-5zeolite;
- a shell comprising a mesoporous fibrous silica comprising KCC-1 and heteroatoms comprising aluminum, the shell in direct contact with at least a majority of an outer surface of the core;
- and
- wherein:
- the catalyst system has a Si/Al molar ratio of greater than 5 to equal or less than 20, and
- at least a portion of the shell has a thickness of from 90 nanometers (nm) to 180 nm.
A method of synthesizing a catalyst system having a core-shell morphology, the method comprising:
- mixing cetyltrimethylammonium bromide, urea, aluminum isopropoxide, a zeolite, and water to produce a first solution;
- mixing a hydrocarbon solvent, tetraethyl orthosilicate, and a co-solvent to produce a second solution;
- mixing the first solution and the second solution to produce a mixture;
- and
- heating the mixture to produce the catalyst system, wherein the catalyst system comprises:
- a core comprising a ZSM-5 zeolite;
- a shell comprising a mesoprous fibrous silica comprising KCC-1 and heteroatoms comprising aluminum, the shell in direct contact with at least a majority of an outer surface of the core;
- and
- wherein:
- the catalyst system has a Si/Al molar ratio of greater than 5 to equal or less than 20, and
- at least a portion of the shell has a thickness of from 90 nanometers (nm) to 180 nm.
A method for converting hydrocarbons, the method comprising contacting a feed with a catalyst system, the catalyst system comprising:
- a core comprising a ZSM-5 zeolite;
- a shell comprising a mesoporous fibrous silica comprising KCC-1 and a heteroatom comprising aluminum, the shell in direct contact with at least a majority of an outer surface of the core;
- and
- wherein:
- the catalyst system has a Si/Al molar ratio of greater than 5 to equal or less than 20;
- at least a portion of the shell has a thickness of from 90 nanometers (nm) to 180 nm;
- the shell pre-cracks the feed to produce a pre-cracked feed;
- and
- the core cracks the pre-cracked feed to produce light olefins.
Dependencies are inferred from the claim text.