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<p>This work reports the preparation, characterization, and application of silver salt derivatives of HPW (Ag<sub>x</sub>HPW) in ethanol dehydration. The materials were fully characterized by elemental EDXRF analysis, XRD, SAXS, SEM, FT-IR, <sup>31</sup>P MAS NMR, thermal analysis (TG/DTG), N<sub>2</sub> sorption at low temperature (−&#xa0;196&#xa0;°C), and pyridine adsorption acidity. The results of the characterization demonstrated that the Keggin structure was preserved in all the synthesized materials. Using the ethanol dehydration model reaction, it was possible to select the most active catalyst in the series: Ag<sub>2</sub>HPW. Activation of this salt at 200 and 300&#xa0;°C revealed that the degree of hydration is an important parameter for catalytic activity. In addition, a dependence on the BET specific surface area was detected for both conversion and selectivity towards ethylene in the salt series. The conversion of ethanol was significantly enhanced after loading 20&#xa0;wt.% of Ag<sub>2</sub>HPW onto ordered mesoporous silica type SBA-15. The reaction conditions were optimized, and the best catalyst (20%Ag<sub>2</sub>HPW/SBA-15, calcined at 300&#xa0;°C) achieved complete ethanol conversion with about 100% selectivity towards ethylene at a temperature of 400&#xa0;°C.</p> Graphical abstract <p></p>

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Silver salts of 12-tungstophosphoric acid supported on SBA-15: effect of enhanced specific surface area on ethanol dehydration

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Mayara A. Resende,
  • Maria Clara Hortencio Clemente,
  • Gesley Alex Veloso Martins,
  • Luís Carlos Cides da Silva,
  • Marcia C. A. Fantini,
  • Sílvia C. L. Dias,
  • José A. Dias

摘要

This work reports the preparation, characterization, and application of silver salt derivatives of HPW (AgxHPW) in ethanol dehydration. The materials were fully characterized by elemental EDXRF analysis, XRD, SAXS, SEM, FT-IR, 31P MAS NMR, thermal analysis (TG/DTG), N2 sorption at low temperature (− 196 °C), and pyridine adsorption acidity. The results of the characterization demonstrated that the Keggin structure was preserved in all the synthesized materials. Using the ethanol dehydration model reaction, it was possible to select the most active catalyst in the series: Ag2HPW. Activation of this salt at 200 and 300 °C revealed that the degree of hydration is an important parameter for catalytic activity. In addition, a dependence on the BET specific surface area was detected for both conversion and selectivity towards ethylene in the salt series. The conversion of ethanol was significantly enhanced after loading 20 wt.% of Ag2HPW onto ordered mesoporous silica type SBA-15. The reaction conditions were optimized, and the best catalyst (20%Ag2HPW/SBA-15, calcined at 300 °C) achieved complete ethanol conversion with about 100% selectivity towards ethylene at a temperature of 400 °C.

Graphical abstract