Porous silica powder
An object of the present invention is to provide a porous silica powder suitable for, for example, a gas chromatography support, and the porous silica powder has an average pore diameter of 0.5 to 10 μm as determined by a mercury intrusion method, a volume of pores having a 100 nm or smaller pore diameter of 0.2 cm 3 /g or less as determined by a nitrogen gas adsorption method, a specific surface area of 0.5 to 100 m 2 /g as determined by a nitrogen gas adsorption method, and a particle size distribution of 10 to 1000 μm.
1. A porous silica powder consisting of silica particles with a particle size of 100 μm-1000 μm,
and having an average pore diameter of 0.8 to 5.0 μm,
a volume of pores with a 100 nm or smaller pore diameter of 0.001 to 0.1 cm 3 /g,
a specific surface area of 0.7 to 50.0 m 2 /g.
2. The porous silica powder according to claim 1 , having a bulk specific gravity of 0.2 to 0.7 g/mL.
3. The porous silica powder according to claim 1 , obtained by pulverizing or granulating porous silica formed from a reaction mixture comprising acid, a water-soluble polymer, and organosilicate.
4. The porous silica powder according to claim 3 , obtained by forming the porous silica from the reaction mixture using a sol-gel method, and firing the porous silica before or after pulverization or granulation.
5. A gas chromatography support, comprising the porous silica powder of claim 1 .
6. An adsorbent for a liquid component or a gas component, comprising the porous silica powder of claim 1 .
7. The porous silica powder according to claim 2 , obtained by pulverizing or granulating porous silica formed from a reaction mixture comprising acid, a water-soluble polymer, and organosilicate.
8. A gas chromatography column comprising:
a gas chromatography support comprising the porous silica powder of claim 1 , wherein a surface of the gas chromatography support is coated with a non-volatile liquid; and
a tube filled with the gas chromatography support.