Abstract:
A gas-microemulsion reaction precipita-
tion method was employed to prepare nano-Ce0.5-
Zr0.5O2 by absorption of NH3 into water-in-oil (W/O)
microemulsion in a rotor–stator reactor . The effects of
different operating conditions including final pH of the
microemulsion, reaction temperature, initial Ce3? and
Zr4? concentration, rotation speed, and gas–liquid
volumetric ratio were investigated. Nano-Ce0.5Zr0.5O2
with an average diameter of about 5.5 nm, a specific
surface area of 215.6 m2/g and a size distribution of
4–8 nm was obtained under the optimum operating
conditions. The as-prepared nano-Ce0.5Zr0.5O2 was
loaded with Au to prepare nano-Au/Ce0.5Zr0.5O2
catalyst which was subsequently used for CO oxida-
tion test. CO conversion rate reached 100 % at room
temperature, indicating high catalytic activity of the
nano-Au/Ce0.5Zr0.5O2 catalyst