Citation: HAO Zhi-Qiang, YU Zhi-Hui, LI Zhong. Influence of Ni/Fe Molar Ratio on Surface Properties of Ni-Fe Catalysts and Hydrogenation Performance of Dinitrotoluene[J]. Chinese Journal of Inorganic Chemistry, ;2015, 31(8): 1571-1580. doi: 10.11862/CJIC.2015.186 shu

Influence of Ni/Fe Molar Ratio on Surface Properties of Ni-Fe Catalysts and Hydrogenation Performance of Dinitrotoluene

1.
1. Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China;
2.
2. Sedin Engineering Company Limited, Taiyuan 030024, China

Corresponding author: LI Zhong,
Received Date: 12 April 2015
Available Online: 21 May 2015
Fund Project: 国家"973"计划(No.2012CB723105)资助项目。 (No.2012CB723105)

Ni-Fe catalysts were prepared via the replacement reaction of NiCl₂ by Fe and used for the selective hydrogenation of dinitrotoluene (DNT) in liquid phase. The influences of Ni/Fe molar ratio (n_Ni/n_Fe) on the surface properties and catalytic performance of Ni-Fe catalysts were investigated. The characterization results from XRD, Low temperature nitrogen adsorption -desorption, H₂-TPD, XPS and TEM show that n_Ni/n_Fe has a significant effect on the surface properties of Ni-Fe catalysts. When n_Ni/n_Fe is 1:4, the effect of Fe inhibition on the oxidation of nickel is more apparent, the chemical adsorption of hydrogen is 0.16 mmol·g^-1 and the dispersion of active species Ni achieves 23%. The performance of Ni-Fe catalysts is greatly improved. Under the optimized catalysts preparation conditions, the conversion of DNT (dinitrotoluene) and the selectivity of TDA (toluenediamine) could reach~100% and 99%, respectively. In addition, Ni-Zn Urushibara nickel catalysts and Ni-Fe catalysts have~the same catalytic hydrogenation~pathway but different catalytic reaction rate in a different reaction stages.
- Ni-Fe catalyst;dinitrotoluene;toluenediamine;catalytic hydrogenation
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