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Aqueous Phase Hydrodeoxygenation of Phenol over Ni3P-CePO4 Catalysts

Yu, Zhiquan, Wang, Yao, Liu, Shan, Yao, Yunlong, Sun, Zhichao, Li, Xiang, Liu, Yingya, Wang, Wei, Wang, Anjie, Camaioni, Donald M., Lercher, Johannes A.
Industrial & engineering chemistry process design and development 2018 v.57 no.31 pp. 10216-10225
Fourier transform infrared spectroscopy, Lewis acids, X-ray diffraction, X-ray photoelectron spectroscopy, acidity, aqueous solutions, catalysts, catalytic activity, coprecipitation, drying, hydrogenation, nickel, nitrogen, phenol, process design, pyridines, temperature, transmission electron microscopy
Unsupported Ni₃P-CePO₄ catalysts were prepared by coprecipitation, followed by drying, calcination, and temperature-programmed reduction. The prepared catalysts were characterized by XRD, N₂ adsorption–desorption, TEM, STEM-EDS elemental mapping, XPS, NH₃-TPD, FT-IR of adsorbed pyridine, and H₂-TPR. Their catalytic performances in hydrodeoxygenation (HDO) were investigated using an aqueous solution of phenol (5.0 wt %) as the feed. CePO₄ was generated in coprecipitation and stable in the subsequent drying, calcination, and temperature-programmed reduction (final temperature 500 °C). It is shown that the addition of CePO₄ resulted in enhanced HDO activity, and a maximum activity appeared at a Ce/Ni ratio of 0.3. The presence of CePO₄ improved the dispersion of Ni₃P significantly, leading to enhanced hydrogenation activity. CePO₄ served as the major dehydration sites as well because of its surface acidity (mainly Lewis acid). In addition, the kinetics of the aqueous phase HDO of phenol and cyclohexanol catalyzed by Ni₃P and by Ni₃P-CePO₄ with Ce/Ni ratio of 0.3 were investigated.