期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 8, 页码 10078-10086出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b01419
关键词
Pt; Magnetism; Hydrodeoxygenation; Phenols; Dehydrogenation; Coupling process
资金
- National Natural Science Foundation of China [21776236, 21676225]
- Natural Science Foundation of Hunan Province [2018E2384]
- Collaborative Innovation Centre of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization
Magnetic colloidal sol was first prepared and added in the mixed solution of Ni(NO3)(2) and Al(NO3)(3). After the constant-pH coprecipitation and calcination, magnetic NiO Al2O3@Fe3O4 mixed oxides were formed and used as supports for Pt-based catalysts. The activities of these magnetic Pt/NiO Al2O3@Fe3O4 catalysts were tested in the hydrodeoxygenation (HDO) of phenols such as 4-ethylphenol, 4-methylphenol, and guaiacol. These exhibited high HDO activity, and aromatic hydrocarbons were produced through a coupling process of hydrodeoxygenation and dehydrogenation. The addition of Fe enhanced both the conversion and aromatic hydrocarbons selectivity, which was attributed to the electron transfer between metallic Pt and Fe. For example, after the liquid phase HDO of 4-ethylphenol at 300 degrees C and 2.0 MPa for 1.5 h, 97.9% conversion and 18.3% toluene selectivity were obtained. When the reaction time was prolonged to 8 h, ethylbenzene selectivity increased to 88.0%. Moreover, these Pt/NiO Al2O3@Fe3O4 catalysts were easily recycled from the liquid reaction mixture by employing an external magnet, but the dehydrogenation stability needs to be further improved.
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