Fabrication of Biomass Derived Pt-Ni Bimetallic Catalyst and Its Selective Hydrogenation for 4-Nitrostyrene

Abstract

The hydrogenation products of aromatic molecules with reducible groups (such as C=C, NO2, C=O, etc.) are relatively critical intermediate compounds in fine chemicals, but how to accurately reduce only specific groups is still challenging. In this work, a bimetallic Pt-Ni/Chitin catalyst was prepared for the first time by using renewable biomass resource chitin as support. As the carrier, the chitin was constructed into porous nanofibrous microspheres through the sol-gel strategy, which was favorable for the adhesion of nano-metals and the exchange of reactive substances due to its large surface area, porous structure, and rich functional groups. Then the Pt-Ni/Chitin catalyst was applied to selective hydrogenation with the model substrate of 4-nitrostyrene. As the highly dispersed Pt-Ni NPs with abundant exposed active sites and the synergistic effect of bimetals, the Pt-Ni/Chitin catalyst could efficiently and selectively hydrogenate only NO2 or C=C with yields of ~99% and TOF of 660 h−1, as well as good stability. This utilization of biomass resources to build catalyst materials would be important for the green and sustainable chemistry.

Ionic Liquid-Guided One-Step Green Synthesis of Au–Pd Superbranched Trigonal Nanoframes and Their Highly Selective Hydrogenation of 4-Nitrostyrene

“…The TOF of Au–Pd STNFs-1 is calculated to be as high as 1121 h –1 , which is 8 times higher than that of Pd nanosheets. The result indicates that in the 4-nitrostyrene hydrogenation reaction, Au–Pd STNFs-1 possesses dramatically higher catalytic activity and selectivity toward 4-nitroethylbenzene in heterogeneous catalysis under mild conditions than most catalysts in the literature. ,− For practical applications, the stability of the catalyst is also an important indicator. As shown in Figure f, at the first reaction of 1.5 min, the 75.3% conversion of 4-nitrostyrene and 100% selectivity toward 4-nitroethylbenzene can be finished.…”