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• W2079900007 abstract "Oxidative dehydrogenation of ethane to ethylene has been studied on V- and Cr-based phosphate catalysts at 550°C. yielding almost exclusively ethylene and COx. Zirconium hydrogenophosphates in their α or β phase were either submitted to cationic exchange of protons by VO2+ and Cr3+ salts or impregnated by such salts and then compared to (VO)2P2O7 and CrPO4 pure phases. VO2+ and Cr3+ on the αZr(HPO4)2·2H2O phase were observed to be more selective toward ethylene than the same cations deposited or exchanged on βZr(HPO4)2 and than the corresponding oxides V2O5 and Cr2O3 either pure (bulk) or deposited on supports as SiO2, ZrO2 or ZrP2O7. Moreover, (VO)2P2O7 (and to a lesser extent CrPO4) were observed to be even more selective toward ethylene at similar conversion levels. However, in terms of cation content per weight, the better yields of ethylene were obtained for αZrCrP and CrαZrP samples. The turnover number of ethane conversion per cation accessible was 0.26 min−1 for both V and Cr cations exchanged or supported on an αZrP phase. Ultraviolet (UV) and electron spin resonance (ESR) spectroscopic techniques, which are very sensitive to the oxidation state and environment symmetry of V and Cr cations, were used in addition to structural and morphological determination techniques such as X-ray diffraction (XRD), infrared (IR), BET, scanning electron microscopy (SEM), etc. Characterization was done after calcination in air at 500550°C and after catalytic testing at 550°C. All data allowed us to conclude that catalytic features are related to V and Cr local arrangements (small clusters or chain arrangements) and to the counter anion, O2− or PO43−. The best catalyst for ethane oxidative dehydrogenation consisted of VO2+ and Cr3− chains separated by PO43− anions, which are stronger bases in the sense of Pearson than O2− anions." @default.
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• W2079900007 date "1995-08-01" @default.
• W2079900007 modified "2023-09-25" @default.
• W2079900007 title "Oxidative dehydrogenation of ethane on V- and Cr-based phosphate catalysts" @default.
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• W2079900007 doi "https://doi.org/10.1016/0927-6513(95)00019-6" @default.
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