Aluminum dihydrogen tripolyphosphate: Thermodynamic characteristics

作者：Matskevich N I^*; Wright A J; Wolf Th; Vyazovkin I V; Anyfrieva O I; Matskevich M Yu

来源：Journal of Chemical Thermodynamics, 2017, 111: 27-30.

DOI：10.1016/j.jct.2017.03.017

• Aluminum dihydrogen tripolyphosphate
• Solution calorimetry
• Thermochemical characteristics
• Standard molar enthalpy of formation

For the first time solution enthalpies of Al, H3PO4, and AlH2P3O10 x 2H(2)O in 2 mol dm (3) NaOH have been measured as following: Delta H-sol(o) (1) = -404.75 +/- 4.36 kJ mol (1); Delta H-sol(o) (2) = -189.48 +/- 0.54 kJ mol (1); Delta H-sol(o) (3) = -238.95 +/- 3.32 kJ mol (1). On the basis of experimental data the standard molar enthalpy of formation and enthalpies of some reactions with participation of AlH2P3O10 x H2O were calculated. The enthalpy of interaction of Al with H3PO4 is Delta H-r(o) = -734.24 +/- 5.56 kJ mol (1). It was established that according to thermodynamic data Al2O3 can react with H3PO4 forming investigated compound at 513 K. Employed compound (AlH2P3O10 x H2O) can react with H2O with formation of AlPO4 and phosphorous acid. All the data were obtained for the first time.

• 出版日期2017-8