No abstract

Thermo-exfoliated graphite (TEG)/CuO/Cu2(OH)3NO3:(Co2+/Fe3+) composites were prepared using a wet impregnation method and subsequent thermal treatment. The physicochemical characterization of the composites was carried out by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and Ar temperature-desorption techniques. The catalytic efficiency toward CO conversion to CO2 was examined under atmospheric pressure. Characterization of species adsorbed over the composites taken after the activity tests were performed by means of temperature programmed desorption mass-spectrometry (TPD MS). (TEG)/CuO/Cu2(OH)3NO3:(Co2+/Fe3+) composites show superior performance results if lower temperatures and extra treatment with H2SO4 or HNO3 are used at the preparation stages. The catalytic properties enhancements can be related to the Cu2(OH)3NO3 phase providing reaction centers for the CO conversion. It has been found that prevalence of low-temperature states of desorbed CO2 over high-temperature ones in the TPD MS spectra is characteristic of the most active composite catalysts.

No abstract

No abstract

The catalytic activity of copper oxide in the carbon black reaction with air oxygen has been studied with the catalyst addition to a sample by different methods. It has been shown that copper oxide added as copper acetate from the ether solution accelerates the carbon black oxidation at 700 K approxi mately by a factor of 110, copper acetate added from a water solution accelerates the carbon black oxida tion by a factor of 300, and if the catalyst is added as a copper-polymer carboxylated complex, the carbon black oxidation is accelerated by a factor of 460. It has been assumed that the difference in catalytic activity of copper oxide added by various methods is caused by the nonuniformity of the copper distribution over the carbon black surface.