Abstract
Background: Liquid-phase catalytic hydrogenation of m-dinitrobenzene is an environmentally friendly routine for m-phenylenediamine production. The key to increasing product yield is to develop catalysts with high catalytic performance. In this work, La2O3-modified Ni/SiO2 catalysts were prepared and applied to the hydrogenation of m-dinitrobenzene to m-phenylenediamine. The effect of La2O3 loading on the properties of Ni/SiO2 was investigated. The reaction kinetic study was performed in ethanol over Ni/3%La2O3-SiO2 catalyst, in order to clarify the reaction mechanism of m-dinitrobenzene hydrogenation. Results: It was found that the activity of the silica supported nickel catalysts is obviously influenced by La2O3 loading. Ni/3%La2O3-SiO2 catalyst exhibits high activity owing to its well dispersed nickel species,with conversion of m-dinitrobenzene and yield of m-phenylenediamine up to 97.1% and 94%, respectively. The results also show that Ni/3%La2O3-SiO2 catalyst can be reused at least six times without significant loss of activity. Conclusion: La2O3 shows strong promotion of the effect of Ni/SiO2 catalyst for liquid-phase hydrogenation of m-dinitrobenzene. La2O3 loading can affect the properties of Ni/SiO2 catalyst. Based on the study of m-dinitrobenzene hydrogenation kinetics over Ni/3%La2O3-SiO2 catalyst, a possible reaction mechanism is proposed.
Original language | English (US) |
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Pages (from-to) | 1381-1389 |
Number of pages | 9 |
Journal | Journal of Chemical Technology and Biotechnology |
Volume | 84 |
Issue number | 9 |
DOIs | |
State | Published - 2009 |
Externally published | Yes |
Keywords
- Hydrogenation
- Lanthanum oxide
- M-dinitrobenzene
- M-phenylenediamine
- Ni/SiO catalyst
ASJC Scopus subject areas
- Biotechnology
- General Chemical Engineering
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Waste Management and Disposal
- Pollution
- Organic Chemistry
- Inorganic Chemistry