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Hydrothermal modification of silica gels (xerogels) 1. Effect of treatment temperature on their porous structure

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

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 767 KB
Volume: 105
Category: Article
ISSN: 0927-7757
DOI: 10.1016/0927-7757(95)03273-8

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✦ Synopsis

The effect of hydrothermal treatment temperature (in the range 150-300°C) on the structural parameters of silica gels was investigated. Silica gels with different starting porous structures were used for modification. The specific surface areas of the modified sorbents varied from 830 to 12 m 2 g-1. Simple mathematical equations describing the changes in specific surface area and pore diameter with treatment temperature are proposed. From the mathematical and/or graphical dependences it is possible to program the hydrothermal treatment process to obtain silica gels with desired porous structures.

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Hydrothermal modification of silica gels

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

✍ R Leboda; E Mendyk; A Gierak; V.A Tertykh 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 500 KB

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