Preparation of porous bodies
OwnerDuncan S. Perrerinventor
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Abstract
A process for the preparation of at least one porous oxide or hydroxide body comprises: (i) adding at least one body comprising a sol of the oxide or hydroxide to a fluid freezing medium; and (ii) raising the temperature of the solid, quenched sol so that solvent nucleation occurs, resulting in the formation of crystals of the dispersion medium, and the dispersion medium melts thereby leaving one or more porous oxide or hydroxide bodies.
Claims18
A process for the preparation of at least one porous oxide or hydroxide body having a pores of a diameter greater than 500 nm, which process comprises:
- (i) adding at least one body consisting essentially of a sol of the oxide of hydroxide to a fluid freezing medium to thereby obtain a solid, quenched sol;
- (ii) recovering said solid quenched sol and raising its temperature so that solvent nucleation occurs in at least step (ii), resulting in the formation of crystals of the dispersion medium and the dispersion medium melts, and
- (iii) separating one or more solid porous bodies having pores of a diameter greater than 500 nm from the dispersant.
A process for the preparation of at least one porous oxide or hydroxide body having a uniformly distributed network of macropores having a diameter greater than 500 nm interconnected with micropores having a diameter of 1 to 10 nm, which process comprises:
- (i) adding at least one body consisting essentially of a sol of the oxide or hydroxide to a fluid freezing medium to thereby obtain a solid, quenched sol;
- (ii) recovering said solid quenched sol and raising its temperature so that solvent nucleation occurs in at least step (ii), resulting in the formation of crystals of the dispersion medium and the dispersion medium melts, and
- (iii) separating one or more solid porous bodies having a uniformly distributed network of macropores having a diameter greater than 500 nm interconnected with micropores having a diameter of 1 to 10 nm from the dispersant.
A porous oxide or hydroxide body having a pores of a diameter greater than 500 nm prepared by a process comprising:
- (i) adding at least one body consisting essentially of a sol of the oxide or hydroxide to a fluid freezing medium to thereby obtain a solid, quenched sol;
- (ii) recovering said solid quenched sol and raising its temperature so that solvent nucleation occurs in at least step (ii), resulting in the formation of crystals of the dispersion medium and the dispersion medium melts, and
- (iii) separating one or more solid porous bodies having pores of a diameter greater than 500 nm from the dispersant.
A porous oxide or hydroxide body having a uniformly distributed network of macropores of a diameter greater than 500 nm interconnected with micropores having a diameter of 1 to 10 nm prepared by a process comprising:
- (i) adding at least one body consisting essentially of a sol of the oxide or hydroxide to a fluid freezing medium to thereby obtain a solid, quenched sol;
- (ii) recovering said solid quenched sol and raising its temperature so that solvent nucleation occurs in at least step (ii), resulting in the formation of crystals of the dispersion medium and the dispersion medium melts;
- and
- (iii) separating one or more solid porous bodies having a uniformly distributed network of macropores of a diameter greater than 500 nm interconnected with micropores having a diameter of 1 to 10 nm from the dispersant.
Dependencies are inferred from the claim text.