Looking for a simple and straightforward method.
Here is an easy method that uses Aluminum-tri-sec-butoxide as a precursor to coat silica particles with alumina. Please refer to examples 1,2 and 8. Best of luck.
https://www.google.com/patents/US5196267?dq=5,196,267&hl=en&sa=X&ei=4TrAU6CDDIrLsQS_0YBA&ved=0CBwQ6AEwAA
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