Preparation and Characterization of Ni-La-B Amorphous Alloy Catalyst for Low-Pressure Dinitrotoluene Hydrogenation

doi:10.3724/SP.J.1088.2012.20324

Abstract

Abstract: Ni-La-B amorphous alloy catalyst was prepared by KBH₄ reduction for liquid phase hydrogenation of dinitrotoluene (DNT) to diaminotoluene (DAT). The effect of La content on microstructure and catalytic performance of Ni-La-B amorphous alloy catalyst for DNT hydrogenation was investigated. The catalyst was characterized by X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, X-ray photoelectron spectroscopy, inductively coupled plasma emission spectroscopy, and H₂ temperature-programmed desorption. The results showed that the addition of La could enhance the degree of long-range disorder, reduce the particle diameter from 70 to 10 nm, weaken the strength of Ni–H bond, and improve the thermal stability and antioxidation. The increasing of La addition from 0 to 6% (molar fraction) led to the enhancement of catalytic performance. When the addition of La was 0.6%, Ni-La-B catalyst exhibited the highest performance for low-pressure (1 MPa) DNT hydrogenation, the conversion of DNT and selectivity for DAT reached 100%. Further increasing of La addition from 6% to 8% led to decrease of the surface Ni content and the catalytic activity obviously.

Key words: dinitrotoluene, diaminotoluene, amorphous alloy, nikel-based catalyst, lanthanum modification

YAN Shao-Wei, FAN Hui, LIANG Chuan, LI Zhong, YU Zhi-Hui. Preparation and Characterization of Ni-La-B Amorphous Alloy Catalyst for Low-Pressure Dinitrotoluene Hydrogenation[J]. Chinese Journal of Catalysis, 2012, 33(8): 1374-1382.

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