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- W2914195762 abstract "In-situ Raman spectroscopy at temperatures up to 500°C is used to identify vanadium species on the surface of vanadium oxide based supported molten salt catalysts during SO2 oxidation. Vanadia/silica catalysts impregnated with Cs2SO4 were exposed to various SO2/O2/SO3 atmospheres and in-situ Raman spectra were obtained and compared to Raman spectra of unsupported model V2O5–Cs2SO4 and V2O5–Cs2S2O7 molten salts. The data indicate that (1) the VV molten complex VVO2(SO4)23− [with characteristic bands at 1034 cm−1 due to v(V=O) and 940 cm−1 due to sulfate] and crystalline Cs2SO4 dominate the catalyst surface after calcination; (2) upon admission of SO3/O2 the excess sulfate is converted to pyrosulfate and the VV dimer molten (VVO)2O(SO4)44− [with characteristic bands at 1046 cm−1 due to v(V=O), 830 cm−1 due to bridging S-O along S-O-V and 770 cm−1 due to V-O-V] is formed and (3) admission of SO2 causes reduction of VV to VIV [with the v(V=O) shifting to 1024 cm−1] and to VIV precipitation below 420°C." @default.
- W2914195762 created "2019-02-21" @default.
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- W2914195762 date "2002-01-01" @default.
- W2914195762 modified "2023-09-27" @default.
- W2914195762 title "In-Situ Raman Spectroscopic Study of Supported Molten Salt Catalysts During SO2 Oxidation" @default.
- W2914195762 doi "https://doi.org/10.1149/200219.0325pv" @default.
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