Method for producing porous inorganic materials
AssigneeMerck Patent GmbH
InventorsKazuki Nakanishi, Naohiro Soga, Tokiyo Minakuchi
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Abstract
The present invention relates to a process for producing inorganic porous materials, mainly composed of glass or glass-ceramic components. The glass or glass-ceramic components can have interconnected continuous macropores with a median diameter larger than 0.1 μm, and mesopores in the walls of said macropores, said mesopores having a median diameter between 2 and 100 nm. The process can include dissolving a water-soluble polymer or some other pore forming agent and a precursor for a matrix dissolving agent in a medium for mixing with a metalorganic compound.
Claims17
A process for producing inorganic porous materials, mainly composed of glass or glass-ceramic components, having interconnected continuous macropores with a median diameter larger than 0.1 μm, and having mesopores in the walls of said macropores, said mesopores having a median diameter between 2 and 100 nm, via a sol-gel transition route comprising:
- (a) dissolving a water-soluble polymer or some other pore forming agent and a precursor for a matrix dissolving agent in a medium that promotes the hydrolysis of metalorganic compounds;
- (b) mixing a metalorganic compound which contains hydrolyzable ligands in the medium to promote a hydrolysis reaction thereof;
- (c) solidifying the mixture through the sol-gel transition, whereby a gel is prepared which has three-dimensional interconnected phase domains, one rich in solvent and the other rich in an inorganic component in which surface pores are contained;
- (d) setting the matrix dissolving agent free from its precursor, whereby the matrix dissolving agent modifies the structure of said inorganic component;
- (e) removing the phase rich in solvent by evaporation drying and/or heat-treatment;
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- (f) calcining the gel to form the porous material.
A process for producing inorganic porous materials, mainly composed of glass or glass-ceramic components, having interconnected continuous macropores with a median diameter larger than 0.1 μm, via sol-gel transition route comprising:
- (a) dissolving a neutral surfactant in a medium that promotes the hydrolysis of metalorganic compounds;
- (b) mixing a metalorganic compound which contains hydrolyzable ligands in the medium to promote a hydrolysis reaction thereof;
- (c) solidifying the mixture through the sol-gel transition, whereby a gel is prepared which has three-dimensional interconnected phase domains, one rich in solvent and the other rich in an inorganic component in which surface pores are contained;
- (d) immersing the gel in a matrix dissolving agent or a precursor thereof, which can dissolve said inorganic component to introduce mesopores into the walls of said macropores, said mesopores having a median diameter between 2 and 100 nm;
- (d) removing the phase rich in solvent by evaporation drying and/or heat-treatment;
- (e) calcining the gel to form the porous material.
A process for producing inorganic porous materials, mainly composed of glass or glass-ceramic components, having interconnected continuous macropores with a median diameter larger than 0.1 μm, and having mesopores in the walls of said macropores, said mesopores having a median diameter between 2 and 100 nm, via a sol-gel transition route comprising dissolving a water-soluble polymer or some other pore forming agent and a precursor for a matrix dissolving agent in a medium for mixing with a metalorganic compound.
Dependencies are inferred from the claim text.