Preparation of catalyst with carrier of ceria-zirconia solid solution and application of catalyst in NOx removal

The invention relates to a preparation method of a catalyst i.e., supported transition metal chrome with a carrier of a ceria-zirconia solid solution, and application of the catalyst in selectively catalytic oxidizing NO in flue gases. The preparation method of the catalyst comprises the following steps: 1, that cerium nitrate and zirconium oxychloride are dissolved in deionized water and stirred, and are dried and calcinated after fully reaction, thereby obtaining the carrier of the ceria-zirconia solid solution; and 2, that chromic nitrate and the ceria-zirconia solid solution are dissolved in water and stirred, and are dried and calcinated after fully reaction, thereby obtaining the catalyst Cr/CexZr1-xO2. The catalyst prepared in the invention increases superoxide radicals to the carrier which is used for catalytic oxidizing NO, thereby assisting migration and diffusion of bulk phase oxygen, and facilitating the NO to be oxidized on carrier surface. Thus, the catalyst has good capability of catalytic oxidizing NO.