Back to results
US 4,059,679 AGranted
Modified zirconium phosphates
AssigneeOhio University
InventorAbraham Clearfield
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeOhio University
InventorAbraham Clearfield
Estimating the term…
A process for modifying various inorganic compounds defined by the formula: M(OH).sub.z (HQO.sub.4).sub.2 -z/2 . xH.sub.2 O wherein M is a metal ion selected from Groups IVA and IVB of the Periodic Table of Elements, Q is an anion selected from Groups VA and VIB of the Periodic Table of Elements, z is any value from 0 to 2 and x is a number of from 0 to 8, by replacing a hydrogen in the inorganic compound with a metal cation. Suitable cations include those elements selected from Groups IA, IIA, IIIA, IVA, IB, IIB, IIIB including the lanthanide and activide series, IVB, VB, VIB, VIIB and VIII of the Periodic Table of Elements and ammonium. Thereafter, elevation of the temperature causes modification of the crystalline structure of the exchanged compound and provides various novel crystalline phases. Substitution of dissimilar metal cations for those present in the heat modified structure, with or without subsequent washing with acid, or washing out of the original metal cations, creates still other crystalline phases.
A process for modifying the interlayer spacing of a crystalline zirconium phosphate hydrate, containing replaceable hydrogen ions, to produce a compound especially suitable for use as a catalyst, comprising the steps of reacting said phosphate with an alkali metal salt or hydroxide for a time sufficient for at least part of the hydrogen ions thereof to be replaced by said alkali metal, elevating the temperature of said cation-containing phosphate to at least partially dehydrate said alkali metal containing zirconium phosphate, and thereafter replacing said alkali metal with a dissimilar metal selected from the groups IB, IIA, IIIB, VIIB, and VIII of the periodic table of elements.
Dependencies are inferred from the claim text.