Impact of Hydrophobic Organohybrid Silicas on the Stability of Ni 2 P Catalyst Phase in the Hydrodeoxygenation of Biophenols
| Autor: | Michael Dierks, Jeganathan Akilavasan, Roberto Rinaldi, Ferdi Schüth, Jinesh C. Manayil, Karen Wilson, Zhengwen Cao |
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| Přispěvatelé: | Commission of the European Communities |
| Jazyk: | angličtina |
| Předmět: |
catalyst deactivation
MODEL COMPOUNDS chemistry.chemical_element hydrodeoxygenation BIO-OIL 010402 general chemistry 7. Clean energy 01 natural sciences Catalysis organosilanes Inorganic Chemistry chemistry.chemical_compound support surface polarity NICKEL PHOSPHIDE CATALYSTS Adsorption tetraethyl orthosilicate ACID ESTERIFICATION Inverse gas chromatography Physical and Theoretical Chemistry SURFACE-ENERGY Inert gas TRANSPORTATION FUELS Science & Technology Chemistry Physical PYROLYSIS 010405 organic chemistry Organic Chemistry CITRIC-ACID 0104 chemical sciences Tetraethyl orthosilicate Chemistry SULFONIC-ACID Nickel chemistry Chemical engineering Physical Sciences INVERSE GAS-CHROMATOGRAPHY Methanol Hydrodeoxygenation |
| Zdroj: | ChemCatChem |
| ISSN: | 1867-3880 |
| DOI: | 10.1002/cctc.201702001 |
| Popis: | Hydrodeoxygenation (HDO) of lignocellulose-derived pyrolysis oils offers an option to produce fuel substitutes. However, catalyst deactivation and stability constitute a significant issue. Herein, the dependence of stability and activity of Ni 2 P/SiO 2 HDO catalysts on the support surface polarity is addressed in detail. The support surface polarity was adjusted by copolymerizing tetraethyl orthosilicate (TEOS) with different types and amounts of organosilanes by a sol-gel process in the presence of nickel nitrate and citric acid. After thermal treatment under an inert atmosphere, Ni/SiO 2 precursors were formed. They were converted into Ni 2 P/SiO 2 catalysts by using NaH 2 PO 2 as a PH 3 source. The catalyst surface polarity was characterized by inverse gas chromatography measurements of the free energy of methanol adsorption, and specific and dispersive surface energies derived from polar and nonpolar probe molecule adsorption. The correlation between catalyst performance and support surface polarity indicates that, to prevent deactivation of the catalyst by water under reaction conditions, the affinity of the support towards polar substances must be decreased below a threshold value. |
| Databáze: | OpenAIRE |
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