Citation: WANG Ya-Nan, YANG Yu-Xia, LI Yong-Wen, LAI Jun-Hua, SUN Kun-Peng. Preparation of Fe₃O₄ Modified Pt-Ru/C Nanocatalysts and Their Catalytic Properties for the Selective Hydrogenation of ortho-Chloronitrobenzene under Solvent-Free Conditions[J]. Acta Physico-Chimica Sinica, ;2013, 29(10): 2239-2244. doi: 10.3866/PKU.WHXB201308151 shu

Preparation of Fe₃O₄ Modified Pt-Ru/C Nanocatalysts and Their Catalytic Properties for the Selective Hydrogenation of ortho-Chloronitrobenzene under Solvent-Free Conditions

1.
1 Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China;
2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
3 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, P. R. China

Received Date: 10 April 2013
Available Online: 15 August 2013

Aseries of Fe₃O₄-modified Pt-Ru/C nanocomposite catalysts were prepared by impregnation and hydrazine hydrate reduction of Pt and Ru precursors. Various Pt/Ru mass ratios of the catalysts were examined in terms of catalytic activity. They were characterized by transmission electron microscopic measurements (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The average diameters of the catalysts with different mass ratios of Pt/Ru were in a range of 2.2-2.5 nmwith narrowsize distributions. The valence states of the nanoparticles indicate strong interactions between the Pt and the carbon support or with Fe₃O₄. The XRDpatterns of the 8Pt-1Ru/Fe₃O₄/C, 6Pt-1Ru/Fe₃O₄/ C, 4Pt-1Ru/Fe₃O₄/C, and 2Pt-1Ru/Fe₃O₄/Ccatalysts have similar profiles, which are attributed to the cubic phase of pure Fe₃O₄ (i.e., no Pt or Ru present). These catalysts selectively hydrogenate ortho-chloronitrobenzene (o-CNB) to the corresponding ortho-chloroaniline (o-CAN) under solvent-free conditions that not only allowed high substrate concentrations promoting the hydrogenation reaction, but also enabled easy product separation and purification. They exhibited excellent catalytic activity (turnover frequency (TOF) range: 0.98-2.09 mol·mol^-1·s^-1) and up to 100% o-CAN selectivity, which was composition-dependent. The o-CAN yield selectivity monotonically increased with the proportion of Ru; however, the catalytic activity decreased. The high catalytic activity and selectivity of Pt-Ru/Fe₃O₄/Cnanoparticles are attributed to electron transfer between the two metals and Fe₃O₄.
- Selective hydrogenation,
- Solvent-free,
- Chloronitrobenzene,
- Chloroaniline,
- Ferroferric oxide,
- Platinum,
- Ruthenium
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Preparation of Fe3O4 Modified Pt-Ru/C Nanocatalysts and Their Catalytic Properties for the Selective Hydrogenation of ortho-Chloronitrobenzene under Solvent-Free Conditions

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通讯作者: 陈斌, bchen63@163.com

Preparation of Fe₃O₄ Modified Pt-Ru/C Nanocatalysts and Their Catalytic Properties for the Selective Hydrogenation of ortho-Chloronitrobenzene under Solvent-Free Conditions