No abstract available

[en] Character of interaction of heteropolyacids (HPA) with zeolite surface depending sufficiently on acidic-basic surface properties was discussed. Analysis of curves of potentiometric titration of the surface modified with Te-KW and P-12WHPA was conducted. It was shown that HPA interaction with acidic zeolite surface was accompanied by complexation, in which the active role was played by hydrogen ions saturating the surface. Differentiation of hydrogens realizing interaction in acid-acid direction was conducted. It was shown that salt-forming HPA hydrogens and surface atoms of zeolite hydrogen participated in studied process

No abstract available

[en] Using the method of paper chromatography and spectrophotometry, the decomposition of tungsten vanadium heteropolyacids of tellurium (4) under the effect of NaOH is studied. It is shown, that heteropolyacids Te-10N-2V, Te-9W-3V, Te-8W-4V are stable to alkali action up to pH 2.5, 3.9, 4.3 respectively, i.e. an increase in the number of V atoms in the complex results in the increase in its stability to alkaline decomposition

[en] Formation of phosphotungstenvanadium heteropolycompounds (HPC) in solution was studied. Using the data of spectrophotometric method concentrations and portions of formation of mixed complexes with different composition, formed in NaH²PO⁴-Na²WO⁴-NaVO³-H⁺-H²O system were calculated. It is shown, that formation of mixed PWsub(n)Vsub(m)HPC, where n+m=12, m=2, 3, 4, 6 proceeds through the stage of frmation of complexes with minimum amount of vanadium atoms, equal two. The degree of phosphorus involvement into mixed heterocomplex is higher in the case, when formation of mixed P-W-V HPC proceeds by saturation with tungsten and vanadium of central lattice of P-2W-2V complexing cell, than by vanadium attachment to saturated P-W complex

No abstract available

No abstract available