Green and selective hydrogenation of aromatic diamines over the nanosheet Ru/g-C3N4-H2 catalyst prepared by ultrasonic assisted impregnation-deposition method

In this study, nanosheet g–C 3 N 4 –H 2 was prepared by thermal exfoliation of bulk g-C under hydrogen. A series Ru/g–C catalysts with Ru species supported on the were synthesized via ultrasonic assisted impregnation-deposition method. Ultrafine nanoparticles (<2 nm) highly dispersed . Strong interaction due to Ru-N x coordination facilitated uniform distribution species. Meanwhile, involvement surface basicity derived from abundant nitrogen sites favourable for enhancing selective hydrogenation performance bi-benzene ring, i.e. almost complete 4,4′-diaminodiphenylmethane (MDA) conversion and >99% 4,4′-diaminodicyclohexylmethane selectivity, corresponding a reaction activity 35.7 mol MDA −1 h Moreover, catalyst in fifth run 36.5 , which comparable that fresh one. The computational results showed as support favorable adsorption dissociation H molecules. substrate scope can be successfully expanded variety other aromatic diamines. Therefore, work provides an efficient green system Nanosheet hydrogen atmosphere, then ultrafine facile method displayed excellent towards diamines alicyclic without any alkaline additives.