The particle size of catalyst has a great influence on its catalytic performance. In order to improve the performance and synthesis efficiency of the catalyst

a microwave plasma-assisted sol-gel method is proposed in this paper. A Ni/CeO

2

catalyst with a substance ratio of n（Ni）: n（Ce）=1:10

1:20

1:100 was synthesized. The catalytic performance of the methane dry reforming was evaluated. The results show that n（Ni）: n（Ce）=1:20 has the highest activity for methane dry reforming. The activity of catalyst synthesized by microwave plasma-assisted sol-gel method（n（Ni）: n（Ce））=1:20) is

higher than that prepared by traditional impregnation method（n（Ni）: n（Ce）=1:20） at both temperature and high air velocity. The catalysts（n（Ni）: n（Ce）=1:20） synthesized by microwave plasma-assisted sol-gel method and impregnation method was characterized by X-ray diffraction（XRD） and scanning electron microscope（SEM）. XRD patterns show that the CeO2 peaks of the catalyst prepared by microwave plasma-assisted sol-gel method is higher than the catalyst prepared by the dipping method. By SEM images characterization

the catalyst particles prepared by microwave plasma-assisted sol-gel method（impregnation method） are distributed at 50～100 nm（100～150 nm）

accounting for about 41%（37%）. The optical emission spectrum was also analyzed. The microwave plasma-assisted sol-gel method introduces active groups such as NH and OH and provides a quenching rate of 148 K/ms. A higher quenching rate effectively reduces the particle size and increases the activity of catalyst.