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Fe-Mg-Al lamellar double hydroxides LDHs are shown to be efficient catalysts in the heterogeneous reduction of Ž . 4-nitrotoluene to 4-aminotoluene using phenylhydrazine or hydrazine hydrate as reducing agent. Catalysts based on Fe III Ž . Ž . Ž . andror Fe II as well as Mg II andror Al III were prepared by precipitation of metal sulfates with Na CO . The samples 2 3 were characterized by means of XRD, TGrMS, TPR, XPS and N physisorption. The catalytic behavior was tested in a 2 glass reactor under argon atmosphere at a temperature of 343 K using ethanol as a solvent. Selectivity to 4-aminotoluene Ž . Ž . amounted to 100% for all tested catalysts. Overall activity of the catalysts increased with increasing Mg II to Al III ratio Ž . and highest overall activity was obtained for an Al-free Mg-Fe III oxiderhydroxide. Highest specific rates referred to the Ž . Ž . Fe surface areas were observed for catalysts prepared from Fe III sulfate. The specific rate decreased with higher Fe II content of the precursor.

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Author

S.M Auer; J.-D Grunwaldt; R.A Köppel; A Baiker

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1381-1169)

Published

1999

Language

EN

Field

Chemistry (Physical Sciences)