Journal
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Volume 48, Issue 2, Pages 141-146Publisher
SOC CHEMICAL ENG JAPAN
DOI: 10.1252/jcej.14we151
Keywords
Photocatalysis; Iron Oxides; Nitroaromatics; Hydrazine; Hydrogenation
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [26289296]
- Grants-in-Aid for Scientific Research [26289296] Funding Source: KAKEN
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Photocatalytic hydrogenation of nitroaromatics was carried out with silica-supported iron oxides (FeOx/SiO2) as catalysts and hydrazine monohydrate as a reductant. Photoirradiation of the catalysts at lambda > 300 nm promotes hydrogenation of nitroaromatics to the corresponding anilines with more than 90% selectivity. The FeOx/SiO2 catalysts with lower Fe loadings possess monomeric Fe-III species behaving as the active sites and exhibit higher photocatalytic activity and aniline selectivity. Electron spin resonance (ESR) analysis revealed that photoexcitation of the hydrazine-adsorbed monomeric Fe-III species produces Fe-II species by the reduction with hydrazine. The Fe-II species promote the reduction of nitroaromatics to anilines, along with the Fe-II -> Fe-III oxidation.
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