A new method for preparing SiO2-Al2O3 gels from aque ous solutions of tetraethoxysilane and aluminum chlo ride was investigated.Addition of propylene oxide to the solutions promoted gelation reaction, yielding translucent gels. It was found that the 4-coordinated Al incorporated in the framework of the gels was formed without heat treatment.Residual chloride ions were removed from the gels by heating. The gels ob tained had large surface areas and were presumed to be homogeneous.

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