Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO2 and Au/Al2O3

Fernando Cárdenas-Lizana, Santiago Gómez-Quero, Mark A. Keane

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

The gas-phase continuous hydrogenation of p-chloronitrobenzene (p-CNB) over 1 mol % Au/TiO2 and Au/Al2O3 was compared for the first time. Both catalysts exhibit 100% selectivity in terms of -NO2 group reduction, resulting in the sole formation of p-chloroaniline (p-CAN). Au/TiO2 exhibited a narrower particle size (1-10 nm) distribution than Au/Al2O3 (1-20 nm) and a smaller surface-area-weighted mean Au size (6 nm versus 9 nm). Au/TiO2 delivered a higher specific hydrogenation rate (by a factor of up to four), a response that is discussed in terms of Au particle size and a possible contribution of the support to p-CNB activation. A CNB isomer reactivity sequence was established, that is, o> p> m, which is attributed to resonance stabilisation effects. The results presented establish a basis for the development of a sustainable alternative route for the production of haloamines.

Original languageEnglish
Pages (from-to)215-221
Number of pages7
JournalChemSusChem
Volume1
Issue number3
DOIs
Publication statusPublished - 25 Mar 2008

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