Unimodal, large-pore silicas by hydrothermal treatment of silici

Details Unimodal, large-pore silicas by hydrothermal treatment of silici Unimodal, large-pore silicas by hydrothermal treatment of silici

1997-12-11

1999-04-27

Marcantoni, Paul

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 80, 501133, 423335, C04B 3514

Patent

active

058978496

ABSTRACT:
The need for silicas with large pore sizes can be met by hydrothermal treatment of a silica powder with a mineralizing agent. Pore sizes in the range 300-25,000 angstroms, and more particularly in the range up to 10,000 angstroms, are readily obtained using mineralizing agents such as hydroxide, carbonate, and fluoride at temperatures in the range 85-300.degree. C. A narrow, unimodal distribution of pores is typical.

REFERENCES:
patent: 4617060 (1986-10-01), Dreibelbis
patent: 4783435 (1988-11-01), Dreibelbis
patent: 4937394 (1990-06-01), Dreibelbis
patent: 5200165 (1993-04-01), Harper et al.
patent: 5202104 (1993-04-01), Watanabe et al.
patent: 5637636 (1997-06-01), Cartwright et al.

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