Copper-cerium oxides supported on carbon nanomaterial for preferential oxidation of carbon monoxide

The CuxO-CeO2/Fe@CNSs, CuxO-CeO2/MWCNTs-Co and CuxO-CeO2/MWCNTs-Ni catalysts were prepared by the impregnation method and characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction, H2-temperature programmed reduction and N2 adsorption-desorption techniques. It was found that the Fe nanoparticles were encapsulated into the multi-layered carbon nanospheres (CNSs). However, the multi-wall carbon nanotubes (MWCNTS) were generated on the Co/Al2O3 and Ni/Al2O3 precursor. The addition of carbon nanomaterial as supports could improve structural properties and low-temperature activity of the CuO-CeO2 catalyst, and save the used amount of metal catalysts in the temperature range with high selectivity for CO oxidation. The copper-cerium oxides supported on carbon nanomaterial had good resistence to H2O and CO2.

Graphical AbstractCO conversion and CO2 selectivity over the supports and catalysts (left) ([CO]in=1%; [O2]in=1%; [H2]in=50%; N2 balance), and CO conversion (grey line) and corresponding CO2 selectivity over the CuxO-CeO2/Fe@CNSs, CuxO-CeO2/MWCNTs-Co and CuxO-CeO2/MWCNTs-Ni catalysts (right) ([CO]in=1%; [O2]in=1%; [H2]in=50%; [CO2]in=15%; [H2O]in=10%; N2 balance)Figure optionsDownload full-size imageDownload as PowerPoint slide