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Phase ratios in the K2O-V2O4-SO3 system at high sulfur trioxide concentrations

  • Physicochemical Analysis of Inorganic Systems
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Abstract

Phase ratios in the three-component oxide system K2O-V2O4-SO3 in the region of the sulfur trioxide concentrations corresponding to its concentrations in the active component of vanadium catalysts for SO2 to SO3 conversion have been studied using powder X-ray diffraction, IR spectroscopy, microscopy, and chemical analysis. Four individual compounds (K2VO(SO4)2, K2(VO)2(SO4)3, K2VO(SO4)2S2O7, and K2(VO)2(SO4)2S2O7) and K2(VO)2(SO4)2S2O7 and VOSO4-base solid solutions of composition K2(VO)2+x (SO4)2+x S2O7 (0 ≤ x ≤ 1.5) were found in the system. K2VO(SO4)S2O7 and K2(VO)2(SO4)2S2O7 lose their sulfur trioxide when heated above 350°C under an inert atmosphere, and convert to K2VO(SO4)2 and K2(VO)2(SO4)3, respectively. This implies that K2VO(SO4)2S2O7 and K2(VO)2(SO4)2S2O7, as well as K2(VO)2+x (SO4)2+x S2O7 solid solution, cannot exist in the active component of real industrial catalysts.

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Authors and Affiliations

  1. Institute of Solid State Chemistry, Ural Division, Russian Academy of Sciences, Pervomaiskaya ul. 91, Yekaterinburg, 630090, Russia

    V. N. Krasil’nikov

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  1. V. N. Krasil’nikov
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Original Russian Text © V.N. Krasil’nikov, 2007, published in Zhurnal Neorganicheskoi Khimii, 2007, Vol. 52, No. 2, pp. 301–305.

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Krasil’nikov, V.N. Phase ratios in the K2O-V2O4-SO3 system at high sulfur trioxide concentrations. Russ. J. Inorg. Chem. 52, 258–262 (2007). https://doi.org/10.1134/S0036023607020209

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  • DOI: https://doi.org/10.1134/S0036023607020209

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