Catalytic activity of heteropoly tungstate catalysts for ethanol dehydration reaction: Deactivation and regeneration
| Autor: | Alexandru Popa, Orsina Verdes, Viorel Sasca, Silvana Borcanescu, Mariana Suba |
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| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Chemistry technology industry and agriculture chemistry.chemical_element 02 engineering and technology General Chemistry Coke 010402 general chemistry 021001 nanoscience & nanotechnology Molecular sieve medicine.disease 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound Keggin structure Tungstate Dehydration reaction medicine Dehydration 0210 nano-technology Nuclear chemistry Palladium |
| Zdroj: | Catalysis Today. 366:123-132 |
| ISSN: | 0920-5861 |
| Popis: | The pure and palladium doped 12-tungstophosphoric acid - H3PW12O40 (HPW) and its cesium salts CsxH3-xPW12O40 (x = 1, 2, 2.25 and 2.5) were prepared and characterized by thermal analysis, FTIR, XRD, BET and XPS methods. In this paper were determined the optimal reaction temperature and the effect of palladium on the coke content during the dehydration of ethanol in the temperature range of 200−350 °C. Above 300 °C, a strong deactivation of the catalysts was caused by coke formation. The catalytic tests demonstrate that by supporting the HPW and PdyPW (y = 0.15, 0.2 and 0.25) on mesoporous molecular sieve SBA-15 the catalytic activity in ethanol dehydration reaction was improved. Palladium doping of HPW/SBA-15 significantly decreases the formation of coke deposit. The formation of coke during the ethanol dehydration does not affect the Keggin structure which led us to conclude that such catalysts can be regenerated in air and regain their catalytic activity for a short time. |
| Databáze: | OpenAIRE |
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