Acta Phys. -Chim. Sin. ›› 1990, Vol. 6 ›› Issue (01): 77-82.doi: 10.3866/PKU.WHXB19900113

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Mass Spectrography Study on the Existence and Thermal Stability of Water in 12-Molybdophosphoric Acid

Yang Shang-Run;Lv De-Yi;Tang Wei;Fu Xian-Cai   

  1. Department of Chemistry,Nanjing University
  • Received:1988-07-05 Revised:1989-05-12 Published:1990-02-15
  • Contact: Yang Shang-Run

Abstract: The existence and thermal stability of H_2O in 12-molybdophosphoric acid (PMA) have been studied by temperature programmed desorption-mass spectrography (TPDMS) and infrared spectrography (IR).
A PMA sample containing 19.1 H_2O/P, H_3(PMo_(12)O_(40))·17.6 H_2O, was prepared, its water content was determined according to Fig.1. The TPD MS spectrum of H_2O (m/z=18) in PMA (solid line Fig.3) was recorded after vacuum outgassing(0.27 Pa) at 290 K (the total time of outgassing in the range 77.4-290 K was 142.5 min). Separated spectra (Fig.3) and their parameters simulated by spectrogram superposition method~[7] and consulting table method~[8] (Table) show that there exist 7 kinds of H_2O in PMA.
In situ IR spectra for PMA at different conditions (Fig.4) revealed...