Vapor phase synthesis of supported Pd, Au, and unsupported bimetallic nanoparticle catalysts for CO oxidation

Au/CeO2 Catalysts: Structure and CO Oxidation Activity

“…Figure 3 shows micrographs of the obtained ceria nanoparticles morphologies and the corresponding catalytic performance of 1% Au/CeO2 catalysts. Rod-like ceria nanoparticles enclosed by (110) and (100) planes resulted in higher activity for the WGS reaction, demonstrating the strong influence of ceria morphology on Au/CeO2 catalytic behavior. Concerning the textural properties, it seems that gold nanoparticles deposition over ceria or doped ceria systems does not produce dramatic alterations.…”

“…In this method, Au remains in ionic form until a thermal treatment at 800 • C is applied. Yang et al [110] proposed the vapor phase synthesis of Au/CeO 2 catalyst. The method consisted of vaporizing the metal target by using a second harmonic generation neodymium-doped yttrium aluminium garnet (Nd-YAG) laser on the cold top plate where the oxide support is placed.…”

“…Figure 3 shows micrographs of the obtained ceria nanoparticles morphologies and the corresponding catalytic performance of 1% Au/CeO 2 catalysts. Rod-like ceria nanoparticles enclosed by (110) and (100) of the [Au + Aux]/CeO2 system to pure gold nanoparticles in contact with oxygen vacancies, demonstrating the activating role of such defects over the clusters of noble metal.…”

“…They established that the reducibility of LaxCe1−xOy nanorods is determined by the preferential exposure of highly active (110) planes and by the La-to-Ce ratio. The La doping was found to act as an inhibitor of LaxCe1−xOy nanorods growth along the [110] direction and resulting in preferential exposure of (110) crystal planes for CeO2 nanorods, a lower reduction temperature, and an increased In this context, intensive research has been carried out aiming to potentiate ceria oxygen mobility and oxygen vacancies population. Similar to the CO oxidation, the most extended strategy to enhance Au/CeO 2 performance is the use of promoters.…”

“…Liang et al reported WGS activity of Au-supported La x Ce 1−x O y nanorods (x = 0-0.5) with a uniform aspect ratio. They established that the reducibility of La x Ce 1−x O y nanorods is determined by the preferential exposure of highly active (110) planes and by the La-to-Ce ratio. The La doping was found to act as an inhibitor of La x Ce 1−x O y nanorods growth along the [110] direction and resulting in preferential exposure of (110) crystal planes for CeO 2 nanorods, a lower reduction temperature, and an increased number of reducible sites in the WGS reaction temperature range.…”