Ultrastable hexagonal, cubic and wormhole aluminosilicate mesostructures
AssigneeBoard of Trustees operating Michigan State University
InventorsThomas J. Pinnavaia, Wenzhong Zhang, Yu Liu
Life of this patent
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Abstract
Mesoporous hexagonal, cubic or wormhole aluminosilicates derived from zeolite seeds using an ionic structure directing agent are described. The aluminum in the structures is stable so that the framework of the structures does not collapse when heated in the presence of water or water vapor (steam) The steam stable aluminosilicates can be used as acid catalysts for hydrocarbon conversions, including the fluidized bed catalytic cracking and the hydrocracking of petroleum oils, and other cracking of organic compounds.
Claims10
A mesostructured aluminosilicate composition which comprises:
- a framework of linked tetrahedral SiO4 and AlO4 units comprising zeolite seeds, which have been pre-formed prior to an assembly of the composition, the framework defining mesopores having an onium ion surfactant in the mesopores, having an Si to Al molar ratio of between about 1000 to 1 and 1 to 1, and having at least one X-ray diffraction peak corresponding to a basal spacing between about 3.0 and 15.0 nm, and wherein the tetrahedral AlO4 units in the framework exhibit a 27Al MAS-NMR resonance with a chemical shift between 57 and 65 ppm relative to a 1.0 M aluminum nitrate solution as an external chemical shift reference.
A mesoporous aluminosilicate composition which comprises:
- a framework of tetrahedral linked SiO4 and AlO4 units comprising zeolite seeds, which have been pre-formed prior to an assembly of the composition, the framework defining mesopores having an Si to Al molar ratio of between about 1000 to 1 and 1 to 1, and having at least one X-ray diffraction peak corresponding to a basal spacing between about 3.0 and 15.0 nm, wherein the tetrahedral AlO4 units in the framework exhibit a 27Al MAS-NMR resonance with a chemical shift between 57 and 65 ppm relative to a 1.0 M aluminum nitrate solution as an external chemical shift reference, wherein a BET surface area is between 400 and 1300 m2 per gram, wherein an average pore size of the framework is between about 2.0 and 10.0 nm, and wherein a pore volume of the framework is between about 0.1 and 1.9 cm3 per gram.
A mesostructured aluminosilicate composition which comprises:
- a framework of linked tetrahedral SiO4 and AlO4 units comprising zeolite seeds, which have been pre-formed prior to an assembly of the composition, the framework defining mesopores having an onium ion surfactant in the mesopores, having an Si to Al molar ratio of between about 1000 to 1 and 1 to 1, and having at least one X-ray diffraction peak corresponding to a basal spacing between about 3.0 and 15.0 nm.
A mesoporous aluminosilicate composition which comprises:
- a framework of tetrahedral linked SiO4 and AlO4 units comprising zeolite seeds, the framework defining mesopores having an Si to Al molar ratio of between about 1000 to 1 and 1 to 1, and having at least one X-ray diffraction peak corresponding to a basal spacing between about 3.0 and 15.0 nm, wherein the composition is derived from zeolite seeds, wherein a BET surface area is between 400 and 1300 m2 per gram, wherein an average pore size of the framework is between about 2.0 and 10.0 nm, and wherein a pore volume of the framework is between about 0.1 and 1.9 cm3 per gram.
Dependencies are inferred from the claim text.