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Dealumination of aluminosilicate zeolites

  • US 4,753,910 A
  • Filed: 02/17/1987
  • Issued: 06/28/1988
  • Est. Priority Date: 02/17/1987
  • Status: Expired due to Fees
First Claim
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1. A method of removing tetrahedral aluminum from an aluminosilicate zeolite containing at least 50 ppm of tetrahedral aluminum, comprising the steps of:

  • (a) contacting the zeolite with an aqueous solution containing a fluorocompound of an element different from aluminum capable of reacting with tetrahedral aluminum in said zeolite to remove said tetrahedral aluminum from the zeolite lattice and produce a water-insoluble aluminum fluoride; and

    (b) contacting the zeolite with an aqueous solution containing a water-soluble fluoride MFn where M has a valence of n and is selected from the group consisting of hydrogen, ammonium and a metal of Group I or Group II of the Periodic Table capable of reacting with insoluble aluminum fluoride to produce a water-soluble species.

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