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WHAT IS SILCA+ALUMINA

  Amorphous silica alumina is a synthetic substance that is used as a catalyst or catalyst   support. It can be prepared in a number of ways for example:

• Precipitation of hydrous alumina onto amorphous silica hydrogel.
• Reacting a silica sol with an alumina sol
• Coprecipitation from sodium silicate / aluminium salt solution.

Refer:

http://en.wikipedia.org/wiki/Amorphous_silica-alumina