Room Temperature Reduction of Nitroaromatics Using Pd Nanoparticles Stabilized on Nano‐CeO₂

Abstract

Palladium nanoparticles stabilized on mesoporous cerium oxide nanoparticles catalyze the reduction of substituted nitroaromatics in presence of sodium borohydride as reductant. A modified two‐step methodology was developed for the synthesis of Pd/CeO2 nanoparticles. First the support CeO2 was synthesized by conventional precipitation method using ammonium oxalate as precipitant and Pd/CeO2 nanoparticles were prepared by hydrothermal treatment. The nanoparticles exhibit excellent catalytic activity and chemoselectivity for the reduction of nitroaromatics towards corresponding amine derivatives at room temperature. A kinetic study suggests that the reaction follows pseudo‐first order rate equation. Thus, synthesized catalyst represents significant role for the reduction of nitroaromatic compounds to value added amino compounds.

Monolayer Bi2W1–xMoxO6 Solid Solutions for Structural Polarity to Boost Photocatalytic Reduction of Nitrobenzene under Visible Light

“…Anilines are critical substances or reaction intermediates in chemical production. 4,5 As the most important intermediate product for manufacture of dyestuffs, medicaments, and insecticides, anilines are commercialized by hydrogenation of nitrobenzene with metal catalysts Ni, 6 Cu, 7 Pd, 8 and Pt. 9 Heterogeneous catalysts use hydrogen gas for producing anilines from nitrobenzene.…”

Recent Advances in the Nanocatalyst-Assisted NaBH4 Reduction of Nitroaromatics in Water

“…Thereafter, these peaks at 400 nm are reduced over time. 34−38 Moreover, gas chromatography–mass spectrometry is needed for the measurement of accurate conversion percentage and for verifying the ensuing reaction products. 39,40…”

“…However, after adding aqueous NaBH 4 , a red shift of the maximum absorption peak occurs immediately from 317 to 400 nm because of the formation of 4-nitrophenolate ions under alkaline conditions. Thereafter, these peaks at 400 nm are reduced over time. − Moreover, gas chromatography–mass spectrometry is needed for the measurement of accurate conversion percentage and for verifying the ensuing reaction products. , …”

Preparation of PdAuCu/C as a Highly Active Catalyst for the Reduction of 4‐Nitrophenol by Controlling the Deposition of Noble Metals

“…The catalysts could be easily recovered by a small magnet and could be reused at least seven times. Many research papers and reviews have focused on the effective catalytic reduction of 4‐NP to 4‐AP [20–50] …”