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- W2073079351 abstract "Abstract Al 2 O 3 supported silicotungstic acid (H 4 SiW 12 O 40 /Al 2 O 3 ) samples were prepared by impregnation and calcined at 350, 450, 550, 650 °C to study the structural evolution of the H 4 SiW 12 O 40 heteropolyacid and its effect on the catalytic performance during glycerol conversion to acrolein. For comparison, a WO x /Al 2 O 3 catalyst was also prepared by impregnation with ammonium paratungstate. The catalysts were extensively characterized using BET, NH 3 -TPD, FT-IR, XRD, Raman, UV–vis DR and XAFS. The evolution of catalyst structure and catalytic performance was carefully resolved and analyzed. XAFS analysis reveals that the oxygen coordination number in the first shell with short W O bond distance increases as the calcination temperature is increased, suggesting the transform of W-species on surface. Slight degradation of Keggin structure of H 4 SiW 12 O 40 supported on Al 2 O 3 is observed upon calcination at 350 and 450 °C, though [SiW 12 O 40 ] 4− anions with Keggin structure are still the dominating species. The total decomposition of Keggin unit occurs after calcination at 550 and 650 °C. Isolated WO 6 species and small amount of WO 3 micro-crystallites are formed as a result of the decomposition. The glycerol conversion increases with acid center concentration under the specified reaction condition. As well, selectivity to acrolein increases with Bronsted/Lewis acid ratio, suggesting the crucial role of Bronsted acid sites for acrolein formation." @default.
- W2073079351 created "2016-06-24" @default.
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- W2073079351 date "2015-01-01" @default.
- W2073079351 modified "2023-09-26" @default.
- W2073079351 title "Supported H4SiW12O40/Al2O3 solid acid catalysts for dehydration of glycerol to acrolein: Evolution of catalyst structure and performance with calcination temperature" @default.
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- W2073079351 doi "https://doi.org/10.1016/j.apcata.2014.10.017" @default.
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