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

Catalysts

Haiyang Cheng¹  Weiwei Lin²  Xiaoru Li²  Chao Zhang² 

[1] State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; E-Mails:

关键词: Ru catalyst;    SnO_x doping;    hydrogenation;    m-dinitrobenzene;    m-nitroaniline;    catalyst recycling;   

DOI  :  10.3390/catal4030276

来源: mdpi

【 摘 要 】

Series catalysts of Ru-SnO_x/Al₂O₃ with varying SnO_x 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-SnO_x/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 SnO_x, 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 SnO_x 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 SnO_x 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-SnO_x/Al₂O₃ catalyst presented high stability: it could be recycled four times without any loss in activity and selectivity.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.