Portal de Periódicos da CAPES

Mass spectrometric studies of the vaporization of phosphorus oxides

1970; Pergamon Press; Volume: 32; Issue: 11 Linguagem: Inglês

10.1016/0022-1902(70)80154-3

1878-1225

David W. Muenow, O. Manuel Uy, John L. Margrave,

Catalysis and Oxidation Reactions

Mass spectrometric investigations of the evaporation of commercially available "phosphorus pentoxide" have shown that at temperatures below 150°C, the equilibrium vapor consists primarily of P4O10(g) with small amounts of P4O9(g). At temperatures between 175°C and approximately 350°C, the vapor contains P4O10(g), P4O9(g) and P4O8(g), while at temperatures greater than 400°C, the molecular species P4O7(g) is observed as well. Second-law heats of reaction for equilibria among the gaseous molecular species have been obtained. Also, free evaporation studies of both solid and liquid P4O6 indicate that the vapor consists primarily of P4O6(g). Average values for the (PO) and (PO) bond energy have been calculated.