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Hydrothermal modification of silica gels (xerogels) 2. Effect of the duration of treatment on their porous structure

✍ Scribed by R Leboda; E Mendyk; A Gierak; V.A Tertykh

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 500 KB
Volume: 105
Category: Article
ISSN: 0927-7757
DOI: 10.1016/0927-7757(95)03272-x

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✦ Synopsis

The effect of the duration of hydrothermal treatment (in the range 1-20 h) on the parameters of the pore structure of silica xerogels was investigated. Silica gels with different initial porous structure parameters were used. The specific surface area (S) of the adsorbents changed from 830 to 38 m 2 g-1. A simple mathematical equation describing the dependence of the specific surface area S on the autoclaving treatment time is proposed. The main changes in the geometrical structure of silica gel occur during the first 6 h of treatment. A long-term (over 6 h) hydrothermal treatment can be recommended to improve the homogeneity of the pore structure of silica gels.

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