A new method for preparing SiO2-Al2O3 gels from aqueous solutions of tetraethoxysilane and aluminum chloride 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 obtained had large surface areas and were presumed to be homogeneous.
