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Citation: WANG Fang, LIU Jun-Hua, YIN Yuan-Qi, XU Xian-Lun. Paly rskite Supported Platinum Catalysts with High Activity and Selectivity for the Liquid-Phase Hydrogenation of para-Chloronitrobenzene[J]. Acta Physico-Chimica Sinica, ;2009, 25(08): 1678-1682. doi: 10.3866/PKU.WHXB20090814 shu

Paly rskite Supported Platinum Catalysts with High Activity and Selectivity for the Liquid-Phase Hydrogenation of para-Chloronitrobenzene

1.
State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China

Received Date: 23 February 2009
Available Online: 17 June 2009

The paly rskite supported platinum catalysts, Pt/PAL(I), Pt/PAL(II), and Pt/PAL(III) were prepared by different reduction methods (ethanol-isopropanol, H2, and NaBH4), and exhibited different catalytic properties for the hydrogenation of para-chloronitrobenzene (p-CNB). Over the Pt/PAL(II) catalyst the selectivity of para-chloroaniline (p-CAN) reached 100% and the hydrodechlorination reaction was fully suppressed during the complete conversion of p-CNB. Superior selectivities of 99.7% and 99.9% for p-CAN were also obtained over Pt/PAL(I) and Pt/PAL(III) catalysts, respectively, although the dehalogenation reaction was not completely avoided. Pt/PAL(I) was the most active catalyst with a turnover frequency (TOF) of up to 27010 h-1. Pt/PAL(II) and Pt/PAL(III) catalysts showed slightly lower activity with a TOF of 17193 and 24871 h-1, respectively. These excellent catalytic properties are attributed to the effects of Pt particle size and the paly rskite support, which was confirmed by transmission electron microscopy (TEM) images and X-ray diffraction (XRD) patterns of the catalysts as well as Fourier transforminfrared (FTIR) spectra of the paly rskite.
- Platinumcatalyst,
- para-Chloronitrobenzene,
- Selective hydrogenation,
- Dechlorination,
- Paly rskite
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