Article ID Journal Published Year Pages File Type
59905 Chinese Journal of Catalysis 2013 11 Pages PDF
Abstract

Mo and La have been independently reported to be good promoters of NiB nanocluster in the hydrogenation of para-chloronitrobenzene (p-CNB). However, a bi-promoter effect of Mo and La in NiB catalysts has not previously been investigated. In this work, a series of La-Mo-doped, nanosized NiB catalysts with different La contents were prepared by chemical reduction and were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The liquid-phase hydrogenation of p-CNB was carried out in a batch reactor at 333 K, 1.2 MPa H2 pressure and at a spinning rate of 500 r/min. Even doping a small amount of La in NiMoB had a significant effect on its activity and selectivity to p-chloroaniline. The addition of an appropriate amount of La suppressed the growth and long-range order of NiMoB and helped the NiMoB maintain its amorphous state. La was determined to be present in its oxide form and to act as a spacer, preventing NiMoB from sintering and aggregation. However, a high amount of La had an opposite effect, and the optimum ratio of La: Ni was 0.2.

Graphical abstractA series of La-Mo-doped, nanosized NiMoB catalysts with various La contents were prepared and characterized. Doping of La had a positive effect on the NiMoB catalyst properties and activity in the hydrogenation of p-chloronitrobenzene.Figure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
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