CePO

4

(in particular

monoclinic CePO

4

) has been rarely used to make supported catalysts. Herein

monoclinic CePO

4

nanoparticles were prepared by calcining hexagonal CePO

4

nanorods (prepared by precipitation) in air at 900℃. Monoclinic CePO

4

nanowires were prepared by calcining hexagonal CePO

4

nanowires (prepared by hydrothermal synthesis at 150℃) in air at 900℃. Both monoclinic CePO

4

materials were used to support Rh

2

O

3

by impregnation using Rh(NO

3

)

3

as a precursor (followed by calcination). The catalytic performance of Rh

2

O

3

/monoclinic CePO

4

composite materials in N

2

O decomposition and CO oxidation was investigated. It was found that Rh

2

O

3

supported on monoclinic CePO

4

nanowires was much more active than Rh

2

O

3

supported on monoclinic CePO

4

nanoparticles. The stability of catalysts as a function of reaction time on stream was studied in both reactions. The influence of co-fed CO

2

O

2

and H

2

O on the catalytic activity in N

2

O decomposition was also studied. These catalysts were characterized by employing N

2

adsorption-desorption

ICP-OES

XRD

TEM

XPS

H

2

-TPR

O

2

-TPD

and CO

2

-TPD. The correlation between physicochemical properties and catalytic properties was discussed.