期刊
CATALYSIS COMMUNICATIONS
卷 11, 期 7, 页码 643-646出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2010.01.013
关键词
Diphenyl carbonate; Oxidative carbonylation; Cryptomelane; Hollandite-type manganese oxides; Pb dopant
资金
- Natural Science Foundation of China [20906073]
- Hubei Provincial Natural Science Foundation of China [2008CDA009]
Palladium catalysts supported on Pb-cation-doped manganese oxide octahedral molecular sieves were prepared and used for heterogeneous oxidative carbonylation of phenol to diphenyl carbonate in the absence of homogeneous cocatalysts. The synthesized catalysts were characterized by ICP-AES, XRD and XPS techniques. The experimental results demonstrated that an enhanced activity was obtained when Pb2+ entered into the tunnels of cryptomelane by replacing K+ to form a new hollandite-type phase of Pb2-xMn8O16. The promotion effect of Pb dopant on activity was ascribed to the increase of low-valence Mn3+ and OH group, which was favor of reoxidation of Pd-0 to active Pd2+ species. (C) 2010 Elsevier B.V. All rights reserved.
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