Phosphoric Acid → Niobium phosphate

HRID 1657178Notes

Reaction equation

HRID 1657178 reaction equation
[O-2].[Nb+5:2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[P:8](=[O:12])([OH:11])([OH:10])[OH:9]>>[P:8]([O-:12])([O-:11])([O-:10])=[O:9].[Nb+5:2].[P:8]([O-:12])([O-:11])([O-:10])=[O:9].[P:8]([O-:12])([O-:11])([O-:10])=[O:9].[P:8]([O-:12])([O-:11])([O-:10])=[O:9].[P:8]([O-:12])([O-:11])([O-:10])=[O:9].[Nb+5:2].[Nb+5:2]

Participants

3

Reactant 2

HCID 1004Phosphoric Acid2×HCID 9903420Niobium pentoxide

Product 1

HCID 10147091Niobium phosphate

Procedure

Niobic acid, Nb2O5.xH2O (60.0 g) is stirred in 85 percent phosphoric acid (600.0 g) at 150° C. The niobium oxide dissolves to form a solution, and upon further heating a precipitate forms. The precipitate is boiled in the phosphoric acid solution for about 2 hours with stirring. The mixture is cooled to room temperature, and the liquid is decanted from the precipitate. Water (500 ml) is added to the precipitate with stirring, and the precipitate is filtered. The washing and filtering cycle is repeated three times. The filtered solid is dried at 150° C. under air, then heated overnight at 300° C. to yield a niobium phosphate catalyst. The elemental analysis of the catalyst is consistent with the composition NbOPO4.

Workup

  1. customto form a solution
  2. temperatureupon further heating a precipitate forms
  3. customthe liquid is decanted from the precipitate
  4. additionWater (500 ml) is added to the precipitate
  5. stirringwith stirring
  6. filtrationthe precipitate is filtered
  7. filtrationThe washing and filtering cycle
  8. customThe filtered solid is dried at 150° C. under air
  9. temperatureheated overnight at 300° C.
  10. customto yield a niobium phosphate catalyst

Sources & evidence

ORD record
ord-dcef47651e9f44e9963ef60667912587
Source dataset
uspto-grants-1993_10
Patent number
US05256786

Reaction notes

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