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Enhancing Activity of Ni2P-Based Catalysts by a Yolk–Shell Structure and Transition Metal-Doping for Catalytic Transfer Hydrogenation of Vanillin

Guotai Li,Hao Li

Catalytic transfer hydrogenation (CTH) is regarded as a promising technology for upgrading biomass to fuels and valuable chemicals in the presence of heterogeneous catalysts. In this work, three Ni2P-based catalysts, such as Ni2P@YSS with a yolk–shell structure, Ni2P@SiO2 with a core–shell structure, and Ni2P/SiO2 with a simple surface-loading structure, were prepared using different synthesis strategies, and were used in the CTH of vanillin in an ethanol environment. The Ni2P@YSS catalyst exhibited the highest conversion (85.6%) and a selectivity of 2-methoxy-4-methylphenol of 76.2% at 180 °C for 5 h among a series of Ni2P-based catalysts, which are closely related to the higher specific surface area (462 m2 g–1), acidic site density (2.31 mmol g–1), and stronger metal–support interactions of the Ni2P@YSS catalyst. Besides, transition metals (Zr and La) were introduced to the Ni2P@YSS catalyst to increase the oxygen vacancy and improve the H dissociation ability, thereby enhancing the catalytic performance of the Ni2P-based catalysts.