Abstract: Three kinds of palladium-loading catalysts are prepared through liquid-phase deposition reduction process with hollandite-type Pb2-xMn8O16 oxides as supporter and with ethylene glycol,formaldehyde and NaBH4 as reductant,respectively.The samples are characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM),and X-ray photoelectron spectroscopy (XPS) techniques.Effects of the reductant on catalysts' micro-structures,redox properties and catalytic performances in oxidative carbonylation of phenol are analyzed.The experimental results prove that the structure of Pb2-xMn8O16 is destroyed when NaBH4 is used as the reductant.The nano-palladium particles of the catalyst that is prepared with ethylene glycol as the reductant distribute more uniformly on the supporter than that of the catalyst prepared with formaldehyde as the reductant.The average size of Pd particles is 4.1 nm in the ethylene glycol-reduced catalyst.Among three kinds of prepared catalysts,the ethylene glycol-reduced catalyst can obtain the highest yield of diphenyl carbonate,as high as 15.6%.
白航, 程磊, 杨小俊, 杜治平. 还原剂对Pd/Pb2-xMn8O16催化剂微观结构与催化性能的影响[J]. 现代化工, 2018, 38(7): 112-115,117.
BAI Hang, CHENG Lei, YANG Xiao-jun, DU Zhi-ping. Effect of reductant on micro-structure and catalytic performance of Pd/Pb2-xMn8O16. Modern Chemical Industry, 2018, 38(7): 112-115,117.
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