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+xS2O7 (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+xS2O7 solid solution, cannot exist in the active component of real industrial catalysts.
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