The preparation of bimetallic cerium/copper organic framework-derived CeCuO_x/C NH₃-SCR catalysts

The bimetallic Ce/Cu-MOF was synthesized by the room temperature hydrothermal method, and then the CeCuO_x/C catalyst was obtained by in-situ pyrolysis method under nitrogen atmosphere. Moreover, their catalytic performance was studied in the selective catalytic reduction of nitrogen oxides using NH₃ as the reductant (NH₃-SCR). Meanwhile, the effect of pyrolysis temperature on the NH₃-SCR performance was also explored. The results showed that the optimum pyrolysis temperature was 600 °C and the CeCuO_x/C-600 catalyst displayed excellent low-temperature activity in the low temperature window (125–275 °C), with a maximum NO_x conversion of 93.4% at 250 °C. It was because that the addition of cerium ions could create more oxygen vacancies as well as the synergistic effect between the bimetallic catalysts, promoting electron transfer and enhancing the redox performance. In addition, the crystallinity and small crystallite size could also affect the catalytic performance.

NH₃-SCR is the most commonly technology to eliminate NO_x. Aiming at the unsatisfactory low-temperature NH₃-SCR performance, the CeCuO_x/C-600 catalysts was prepared by in-situ pyrolysis. It exhibited excellent low-temperature activity within the temperature range of 125–275 °C, and the maximum NO_x conversion at 250 °C was 93.4%.