Transition metal phosphide nanoparticles supported on silica were used as catalysts to investigate the hydrodeoxygenation of methyl laurate (used as a model compound for vegetable oils). Ni2P, Ni1Mo1P, and Ni1.6Mo0.4P were synthesized using a molecular precursor route. The nanoparticles were added to the silica support without any changes in their structure or particle size. As a reference and for comparison, MoP/SiO2 was also prepared by the phosphite method. The prepared catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and chemical analysis. A higher conversion is reached with the MoP/SiO2 monometallic catalyst, close to that with Ni1Mo1P/SiO2. However, this observation is misleading because the differences in dispersion obscure the result that the intrinsic activity (turnover frequency) of the bimetallic catalyst, prepared by a molecular precursor route, is significantly higher than that of the monometallic catalyst, prepared by the phosphite route, revealing a synergistic effect on the catalytic activity due to the formation of the bimetallic phosphide.

中文翻译：

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通过分子前体路线生成金属磷化物纳米粒子，用于月桂酸甲酯的加氢处理

使用二氧化硅负载的过渡金属磷化物纳米粒子作为催化剂来研究月桂酸甲酯（用作植物油的模型化合物）的加氢脱氧。 Ni2P、Ni1Mo1P 和 Ni1.6Mo0.4P 采用分子前驱体路线合成。将纳米颗粒添加到二氧化硅载体中，其结构或粒径没有任何变化。作为参考和比较，还通过亚磷酸盐法制备了MoP/SiO2。通过X射线衍射、X射线光电子能谱、透射电子显微镜和化学分析等手段对所制备的催化剂进行了表征。 MoP/SiO2 单金属催化剂达到了更高的转化率，接近 Ni1Mo1P/SiO2。然而，这一观察结果具有误导性，因为分散度的差异掩盖了这样的结果：通过分子前体途径制备的双金属催化剂的本征活性（周转频率）明显高于通过亚磷酸酯途径制备的单金属催化剂。揭示了由于双金属磷化物的形成而对催化活性的协同效应。