Sol-gel derived oxides and mixed oxides catalysts with narrow mesoporous distribution

A novel sol-gel process for preparing oxides and mixed oxides sols from pre cipitation and peptization process is reported in this article. Inorganic s alts are used as raw materials in this study. It is found that the amount o f acid has great influence on the stability and particle diameter distribut ion of the precursor sols. Ultrasonic treatment is used to prepare alumina sol at room temperature. The result of Al-27 NMR shows that there exist Al- 13(7+) species in the sol. By controlling the sol particles with narrow par ticle diameter distribution, alumina, titania and silica-alumina (SA) mater ials with narrow mesoporous distribution are formed by regular packing of s ol particles during gelation without using any templates. The results also show that the structure and particle diameter distribution of precursor sol determine the final materials' texture.