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Lanthanum-promoted Pd/Al2O3 catalysts for liquid phase in situ hydrogenation of phenol to cyclohexanone

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Abstract

A series of lanthanum-promoted Pd/Al2O3 catalysts (Pd/La x –Al2O3), for the liquid phase in situ hydrogenation of phenol into cyclohexanone, was prepared by the incipient wetness impregnation method. Addition of lanthanum to Pd/Al2O3 enhances the TOF of the catalyst for the liquid phase in situ hydrogenation of phenol significantly. The conversion of phenol is highly dependent upon the atomic ratio of La/Pd, but the presence of lanthanum has little effect on the selectivity of cyclohexanone. The selectivity of cyclohexanone in the liquid phase in situ hydrogenation of phenol over the Pd/La x –Al2O3 catalyst is as high as 98%, which is quite higher than the hydrogenation using H2 (67.4%). Results from BET, EDS, CO chemosorption, XRD and H2-TPR suggest that the presence of suitable amounts of lanthanum improves the Pd dispersion on the support. The peak temperature for the reduction of PdO in the H2-TPR moves to higher in the presence of lanthanum. Additionally, the Pd particles could adhere to the lanthanum rather than the Al2O3.

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Acknowledgments

This work was supported by the Nation Nature Science Foundation of China (NSFC-20976164), the Specialized Research Fund for The Doctoral Program of High Education of China (SRFDP-20060337001).

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Authors and Affiliations

  1. State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Industrial Catalysis Institute of Zhejiang University of Technology, Hangzhou, 310032, People’s Republic of China

    Yi-zhi Xiang, Ling-niao Kong, Chun-shan Lu, Lei Ma & Xiao-nian Li

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  1. Yi-zhi Xiang
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  2. Ling-niao Kong
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  3. Chun-shan Lu
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  4. Lei Ma
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  5. Xiao-nian Li
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Correspondence to Xiao-nian Li.

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Xiang, Yz., Kong, Ln., Lu, Cs. et al. Lanthanum-promoted Pd/Al2O3 catalysts for liquid phase in situ hydrogenation of phenol to cyclohexanone. Reac Kinet Mech Cat 100, 227–235 (2010). https://doi.org/10.1007/s11144-010-0179-x

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