Co-production of hydrogen and acetaldehyde from ethanol over a highly dispersed Cu catalyst

Using sp2 N atom anchoring effect to prepare ultrafine vanadium nitride particles on porous nitrogen-doped carbon as cathode for lithium-sulfur battery.

The preparation of N-doped carbon with well-defined and well-controlled doping of N species is a challenging work, especially with supported Pt atoms. Here, four kinds of N-doped carbons with well-controlled N species were synthesized using Friedel–Crafts reaction or thermal pyrolysis. It was found that the strong interaction between Pt and N in C–N═C and bridged −NH at the edge of heptazine rings in g-C3N4 improved the performance of Pt/g-C3N4 for nitrobenzene hydrogenation. The calculated turnover frequency of each Pt atom in Pt/g-C3N4 reached 42,865 h–1 at 50 °C, and it was stable for five cycles without agglomeration or leaching of Pt species. These findings provide a promising way for the rational design of the hydrogenation catalysts and the development of well-controlled N-doped carbon materials. 

Structure–Activity Relationship for the Catalytic Hydrogenation of Nitrobenzene by Single Platinum Atoms Supported on Nitrogen-Doped Carbon

This work aims to study the catalytic performance of Cu/Al2O3 catalysts in the catalytic reaction of oxidation of phenol. The addition of La and Mn to Al2O3 support and the calcination temperature influence on the catalytic performance and Cu leaching were studied. The addition of either La or Mn to the support triggered less Cu leaching compared to the unmodified support. The catalysts modified with Mn and calcined at 650ºC and 900 °C yielded low Cu leaching values and high phenol conversions at 120 min of reaction, achieving total consumption of H2O2. The catalysts prepared in the same way but modified with La and calcined at 900 °C, achieved 100% phenol conversion and higher TOC conversion. Copper leaching was higher when the support was modified with La, but improved when compared to the unmodified support, suggesting that the presence of Mn allowed a better anchoring of Cu on the support. However, this was not beneficial for the reaction since a certain amount of Cu in the homogeneous phase was required for the reaction to start. Cu-La-Al2O3 showed stability after consecutive reaction cycles with the corresponding calcinations in each cycle. 

Zixin Zhong

Papers

Catalytic wet air oxidation of toxic containments over highly dispersed Cu(II)/Cu(I)-N species in the framework of g-C3N4.