Zeolite core/silica zeolite shell composite, preparing method of the same, and catalyst including the same
AssigneeSogang University Research Foundation
InventorsKyung Byung Yoon, Cao Thanh Tung Pham
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Abstract
The present disclosure relates to a preparing method of a zeolite core/silica zeolite shell composite, which includes adding a zeolite seed crystal into a gel solution containing a silicon-source compound, a structure directing agent and a fluorine anion-source compound, and then, crystallizing the gel solution for growing a silica zeolite shell containing a crystal structure which is coherent with that of the zeolite seed crystal; a zeolite core/silica zeolite shell composite prepared by the preparing method above; and catalytic use of the zeolite core/silica zeolite shell composite.
Claims11
A preparing method of a zeolite core/silica zeolite shell composite, comprising:
- mixing a silicon-source compound, a structure directing agent, and a fluorine anion-source compound to provide a gel;
- aging the gel;
- adding a zeolite seed crystal into the gel after the gel has been aged;
- and,
- crystallizing the gel for growing a silica zeolite shell containing a crystal structure which is coherent with that of the zeolite seed crystal,
- wherein an amount of the zeolite seed crystal is 0.1% to 10% of moles of the silicon-source compound in the gel,
- wherein in a crystal of the silica zeolite shell, a growth rate of the zeolite seed crystal along its c-axis direction is faster than growth rates of the zeolite seed crystal along its a- and b-axis directions, and,
- wherein the growth rates of the crystal of the silica zeolite shell are controlled by a molar ratio of the structure directing agent and the fluorine anion-source compound.
A preparing method of a zeolite core/silica zeolite shell composite, comprising:
- mixing a silicon-source compound, a structure directing agent, and a fluorine anion-source to provide a solution;
- solidifying the solution to provide a gel;
- aging the gel;
- adding a zeolite seed crystal into the gel after the gel has been aged;
- and,
- then crystallizing the gel for growing a silica zeolite shell containing a crystal structure which is coherent with that of the zeolite seed crystal,
- wherein an amount of the zeolite seed crystal is 0.1% to 10% of moles of the silicon-source compound in the gel,
- wherein in a crystal of the silica zeolite shell, a growth rate of the zeolite seed crystal along its c-axis direction is faster than growth rates of the zeolite seed crystal along its a- and b-axis directions, and,
- wherein the growth rates of the crystal of the silica zeolite shell are controlled by a molar ratio of the structure directing agent and the fluorine anion-source compound.
Dependencies are inferred from the claim text.