Abstract
Heterogeneous palladium catalysts have been supported on the ordered mesoporous carbons (Pd/OMC) with bimodal pores which are prepared by the surfactant-templating approach. Characterization using XRD, TEM, XPS, H2 chemisorption, and N2 sorption techniques reveals that the Pd/OMC catalysts have the ordered 2-D hexagonal mesostructure (space group of p6mm), extremely high surface areas (~1800 m2/g), large pore volumes (~1.64 cm3/g), bimodal pores (6.3 nm of primary mesopores and 1.7 nm of secondary mesopores inside the pore walls), hydrophobic carbon surface, and small metal particles well-dispersed inside the secondary small mesopores. This catalyst exhibits a high yield of 43% for biphenyl from the Ullmann coupling reaction of chlorobenzene in water at 100 °C without assistance of any phase transfer catalyst and can be reused up to 10 times, providing potential opportunities for industrial applications such as coupling and hydrogenation reactions.
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Acknowledgements
This work was supported by NSF of China (20873086 and 20821140537), Shanghai Sci. & Tech. and Edu. Committee (07QH14011, 07SG49, S30406, 0852nm0090 and 08JC1417100), and the program for New Century Excellent Talents in Universities (NCET-07-0560).
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Wang, H., Wan, Y. Synthesis of ordered mesoporous Pd/carbon catalyst with bimodal pores and its application in water-mediated Ullmann coupling reaction of chlorobenzene. J Mater Sci 44, 6553–6562 (2009). https://doi.org/10.1007/s10853-009-3612-7
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DOI: https://doi.org/10.1007/s10853-009-3612-7