| Pd-Co/Al2O3 and Pd/Al2O3 were prepared by the impregnation method and tested for the catalytic performance in the hydrogenation reaction of 2-ethylanthraquinone. Their texture structure, crystal phase structure and electron structure were characterized by means of N2 adsorption-desorption, ICP-AES, CO absorption, XRD, TEM, EDX and XPS. The results showed that the hydrogenation efficiency and selectivity of Pd-Co0.2/Al2O3 were 13.5 g/L and 95.2%, respectively, larger than 11.8 g/L and 87.2% of Pd/ Al2O3, revealing the synergistic effects between Pd and Co. From XPS characterization, it was found that after doping Co, the electrons of some Pd particles was transferred to oxidized Co to form a new structural species Pd-Coδ+. Coδ+in the Pd-Co/Al2O3 system may act as the electrophilic sites for the adsorption and activation of C=O of the 2-ethylanthraquinone molecule through the lone electron pair of the oxygen atom, resulting in the enhanced catalytic performance of Pd-Co catalyst for the hydrogenation of C=O. |
