Abstract
The preparation of a mixed oxide gel composed of silica and magnesia was attempted by a coating method in order to develop a useful column packing material for liquid chromatography. The physical properties of the gels obtained remained almost the same as those of the native silica gel, but the surface silanol groups and the acid strength both changed, depending on the preparation conditions. The chromatographic behaviour of the gels was tested using benzene, dimethyl phthalate, pyridine and phenol as solutes. The magnesia-coated silicas calcined at temperatures between 600 and 800°C exhibited the excellent separation abilities for these compounds.
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