Synthesis of Alumina-Supported RhSn Alloy Nanocatalysts by Using Rh@Sn Core–Shell Nanoparticle Precursors for Toluene Catalytic Hydrogenation

In this work, alumina-supported RhSn alloy nanocatalysts were prepared for toluene hydrogenation. Rh@Sn core–shell nanoparticles were first synthesized through a sequential reduction method and then in situ transformed into RhSn alloy on alumina by calcination and H2 reduction. Relative to Rh/Al2O3, Rh1Sn0.7/Al2O3 catalysts demonstrate enhanced catalytic efficiency for hydrogenation of toluene. At a toluene/Rh molar ratio of 118/1, 0.1 MPa of H2 pressure, and 45 °C, 99.2% of methyl cyclohexane yield was achieved at 2.0 h. The enhanced catalytic efficiency of Rh1Sn0.7/Al2O3 can be ascribed to the synergistic effect between Rh and Sn

Synthesis of Mesoporous Silica-Supported NiCo Bimetallic Nanocatalysts and Their Enhanced Catalytic Hydrogenation Performance

In this work, mesoporous silica SBA-16-supported NiCo bimetallic nanocatalysts were synthesized by coimpregnation of Ni and Co precursors followed by calcination and reduction, and various characterization techniques confirm the formation of NiCo bimetallic nanostructures in the catalysts. The synthesized NiCo/SBA-16 shows enhanced catalytic performance for hydrogenation of a series of nitroaromatics. Under the reaction conditions of 80 °C and 1.0 MPa of H2, the yields of aniline for nitrobenzene hydrogenation over NiCo0.3/SBA-16 can reach more than 99% at 2.0 h. The enhanced catalytic performance can be ascribed to the formation of NiCo bimetallic nanostructures, where the synergistic effect between Ni and Co improves their catalytic activities for hydrogenation of nitroaromatics