Hydrogenation of m-dinitrobenzene to m-phenylenediamine over La2O3-promoted Ni/SiO2 catalysts

Yingxin Liu, Zuojun Wei, Shuguang Deng, Jiyan Zhang

Research output: Contribution to journalArticle

9 Scopus citations

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 languageEnglish (US)
Pages (from-to)1381-1389
Number of pages9
JournalJournal of Chemical Technology and Biotechnology
Volume84
Issue number9
DOIs
StatePublished - 2009

Keywords

  • Hydrogenation
  • Lanthanum oxide
  • M-dinitrobenzene
  • M-phenylenediamine
  • Ni/SiO catalyst

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Waste Management and Disposal
  • Pollution
  • Organic Chemistry
  • Inorganic Chemistry

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