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Nanostructured  Ce 0.5 Zr 0.5 O 2  samples were synthesized by the combustion of the gel obtained from a mixture of polyvinyl alcohol (PVA) and metal nitrates at a temperature as low as 600 ° C . The prepared samples were investigated by x-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). Their specific surface areas were determined from  N 2  adsorption measurement at 77 K by Brunauer–Emmet–Teller (BET) method and their CO catalytic oxidation activities were investigated using a Landcom II instrument. The XRD and FE-SEM results revealed that  Ce 0.5 Zr 0.5 O 2  nanocrystallines began to grow isotropically at 600 ° C  with the nanostructure found in all prepared samples. Further thermal treatment at 600 ° C  for 2 h yields the single crystalline phase  Ce 0.5 Zr 0.5 O 2  nanostructured samples with average crystalline size &lt; 50  nm  and specific surface area of about 73  m 2  g −1 . Besides, the effects of a number of factors such as calcination temperature and Ce/Zr molar ratio on the formation of prepared samples as well as the oxidative conversion of carbon monoxide over nanostructured  Ce 0.5 Zr 0.5 O 2  catalyst were also studied.

advances in natural sciences nanoscience and nanotechnology

Synthesis and investigations on CO catalytic oxidation activity of nanostructured Ce0.5Zr0.5O2 prepared by combustion method using polyvinyl alcohol