Chinese Journal of Applied Chemistry ›› 1988, Vol. 0 ›› Issue (3): 48-53.

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ON THE CATALYTIC BEHAVIOUR OF 2:18-HETEROPOLY-MOLYBDOPHOSPHORIC ACID (SALTS) IN THE DECOMPOSITION OF HO2

Qu Shuhua1, Wu Yue1, Wang Enbo2, You Wanshen2   

  1. 1. Changchun Institute of Applied Chemistry, Academia Sinica;
    2. Department of Chemistry, Northeast Normal University Changchun
  • Received:1987-02-19 Revised:1987-11-19 Published:1988-06-10 Online:1988-06-10

Abstract: The catalytic behaviour of 2:18 heteropoly molybdophosphoric acid and its salts(Dawson structure) in the decomposition of H2O2 has been studied in comparison with that of 1:12 heteropolymolybdophosphoric acid and its salts (Kcggin structure). The results show that H6(P2Mo18O62, so as Ha(PMo12O40 does not posses catalytic activity for H2O2 decomPosition, whereas their Fe3+, Cu2+ salts are more active and their kinetic behaviour toward H2O2 decomposition is different from that of 1:12 heteropolymolybdophosphate in that it obeys the second order equation. It is related to the environmental difference of the countercation in these two structures. The catalytic behaviour remains unchanged, when part of molybdenum ions in 2:18 heteropolymolybdophosphorie acid is substituted by vanadium ions. It indicates that the substtituted vanadium ions are not only the active species, but have the same environment in these two structures.

Key words: Heteropolyacid, Molybdate, Phosphate, Catalytic activity, Hydrogen peroxide, Decomposition