Abstract
The laser vaporization controlled condensation (LVCC) method and the chemical methods were used to prepare the nanoparticle catalysts. These catalysts are pure Co
3O
4, CuO and NiO. The effects of dopants La
2O
3, Sm
2O
3, Y
2O
3, Au, Pt and Pd on the surface and catalytic properties of these catalysts were investigated. The dopant concentration was 6
mol%. The techniques employed were XRD, nitrogen adsorption at −196
°C, oxidation of carbon monoxide by O
2 and TEM.
The results obtained revealed that most of the catalysts prepared by LVCC method gave maximum conversion of CO to CO
2 at room temperature while the catalysts prepared by wet impregnation and sol–gel methods gave maximum conversion at high temperature ranged from 160 to 300
°C. The degree of crystallinity and the particle size of catalysts were examined by XRD and TEM, respectively.