The sorption of sulphur dioxide on silica gel
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1021-1026
- https://doi.org/10.1039/j19670001021
Abstract
Adsorption isotherms of sulphur dioxide on silica xerogels have been obtained for the range 263–323°K. High purity xerogels were used after various degrees of heat treatment at 240, 500, 600, 650, 700, 900, and 1100°. These materials were characterised by low-temperature nitrogen adsorption and by measurement of the density by immersion in mercury. Comparative isotherms were measured at 263°K on commercial silica gels of widely different surface characteristics. Heats of adsorption (qst) were determined from isosters for the monolayer region (θ= 0–0·85). The qst values show a steady decrease with increasing surface coverage from 9·3 to 7·8 kcal. mole–1(240° xerogel). The sorption process is discussed in terms of a physical model.Keywords
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