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Catalysts 2014, 4(3), 276-288; doi:10.3390/catal4030276
Article

Selective Hydrogenation of m-Dinitrobenzene to m-Nitroaniline over Ru-SnOx/Al2O3 Catalyst

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Received: 19 May 2014; in revised form: 23 June 2014 / Accepted: 25 June 2014 / Published: 14 July 2014
(This article belongs to the Special Issue Metal Catalysts Recycling and Heterogeneous/Homogeneous Catalysis)
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Abstract: Series catalysts of Ru-SnOx/Al2O3 with varying SnOx loading of 0–3 wt% were prepared, and their catalytic activity and selectivity have been discussed and compared for the selective hydrogenation of m-dinitrobenzene (m-DNB) to m-nitroaniline (m-NAN). The Ru-SnOx/Al2O3 catalysts were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and hydrogen temperature-programmed reduction (H2-TPR) and desorption (H2-TPD). Under the modification of SnOx, the reaction activity increased obviously, and the best selectivity to m-NAN reached above 97% at the complete conversion of m-DNB. With the increasing of the SnOx loading, the amount of active hydrogen adsorption on the surface of the catalyst increased according to the H2-TPD analysis, and the electron transferred from Ru to SnOx species, as determined by XPS, inducing an electron-deficient Ru, which is a benefit for the absorption of the nitro group. Therefore, the reaction rate and product selectivity were greatly enhanced. Moreover, the Ru-SnOx/Al2O3 catalyst presented high stability: it could be recycled four times without any loss in activity and selectivity.
Keywords: Ru catalyst; SnOx doping; hydrogenation; m-dinitrobenzene; m-nitroaniline; catalyst recycling Ru catalyst; SnOx doping; hydrogenation; m-dinitrobenzene; m-nitroaniline; catalyst recycling
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Cheng, H.; Lin, W.; Li, X.; Zhang, C.; Zhao, F. Selective Hydrogenation of m-Dinitrobenzene to m-Nitroaniline over Ru-SnOx/Al2O3 Catalyst. Catalysts 2014, 4, 276-288.

AMA Style

Cheng H, Lin W, Li X, Zhang C, Zhao F. Selective Hydrogenation of m-Dinitrobenzene to m-Nitroaniline over Ru-SnOx/Al2O3 Catalyst. Catalysts. 2014; 4(3):276-288.

Chicago/Turabian Style

Cheng, Haiyang; Lin, Weiwei; Li, Xiaoru; Zhang, Chao; Zhao, Fengyu. 2014. "Selective Hydrogenation of m-Dinitrobenzene to m-Nitroaniline over Ru-SnOx/Al2O3 Catalyst." Catalysts 4, no. 3: 276-288.


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