Ultrastable porous aluminosilicate structures
AssigneeBoard of Trustees of Michigan State University
InventorsThomas J. Pinnavaia, Wenzhong Zhang, Yu Liu
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Abstract
Mesoporous hexagonal, cubic, lamellar, wormhole, or cellular foam aluminosilicates, gallosilicates and titanosilicates derived from protozeolitic seeds using an ionic structure directing agent are described. The silicon and aluminum, gallium or titanium centers in the structures are stable so that the framework of the structure does not collapse when heated in the presence of water or water vapor (steam). The steam stable compositions can be used as catalysts for hydrocarbon conversions, including the fluidized bed catalytic cracking and the hydrocracking of petroleum oils, and other reactions of organic compounds.
Claims24
A porous structured aluminosilicate composition which comprises:
- a framework of linked tetrahedral SiO4 and AlO4 units, the framework defining pores and 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 2 and 100 nm, and wherein the composition retains at least 50% of an initial framework pore volume after exposure to 20 volume % steam at 800° C. for two hours.
A porous structured aluminosilicate composition which comprises:
- a framework of linked SiO4 and AlO4 units, the framework defining pores and having a Si to Al molar ratio of about 1000 to 1 and 1 to 1, and having at least one X-ray diffraction peak between 2 and 100 nm, and wherein the composition retains at least 75% of an initial framework pore volume after exposure to 20 volume percent steam at 600° C. for four hours.
A porous structured aluminosilicate composition which comprises:
- a framework of linked tetrahedral SiO4 and AlO4 units, the framework defining pores having an organic surfactant in the pores and having a Si to Al molar ratio of between 1000 to 1 and 1 to 1 and having at least one X-ray defraction peak corresponding to a basal spacing between about 2 and 100 nm, wherein the composition retains at least 50% of an initial framework pore volume after exposure to 20 volume percent steam at 800° C. for 2 hours, and wherein the composition is derived from an organic surfactant, an optional co-surfactant, and preformed zeolite seeds.
A structured aluminosilicate composition which comprises:
- a framework of linked tetrahedral SiO4 and AlO4 units, the framework defining mesopores having an surfactant and optionally a co-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 2.0 and 100 nm, and which when calcined retains at least 50% of an initial framework pore volume after exposure to 20 volume % steam at 800° C. for two hours.
A porous aluminosilicate composition which comprises:
- a framework of tetrahedral linked SiO4 and AlO4 units, 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 2.0 and 100 nm, wherein a BET surface area is between 200 and 1400 m2 per gram, wherein an average pore size of the framework is between about 1.0 and 100 nm, and wherein a pore volume of the framework is between about 0.1 and 3.5 cm3 per gram, and which retains at least 50% of an initial framework pore volume after exposure to 20 volume % steam at 800° C. for two hours.
A porous structured silicate composition which comprises:
- a framework of linked tetrahedral SiO4 and units selected from the group consisting of AlO4 units, GaO4 units, TiO4 units and mixed units, the framework defining pores and having an Si to combined Ga, Ti and 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 1 and 100 nm, and wherein the composition retains at least 50% of the initial framework pore volume after exposure to 20 volume percent steam at 600° C. for four hours.
Dependencies are inferred from the claim text.