BiMnO3 Perovskite Catalyst for Selective Catalytic Reduction of NO with NH3 at Low Temperature

A perovskite was used for selective catalytic reduction of NO with NH3 (NH3-SCR) at low temperature in the presence of excess oxygen. The BiMnO3 perovskite catalyst showed high activity in NH3-SCR at 100-240 °C. Experiment and DFT calculation showed that more Lewis acid sites and a high concentration of surface oxygen on BiMnO3 as compared with LaMnO3 were responsible for its better performance. In addition, BiMnO3 was also resistant to water vapor and a mixture of H2O and SO2.

摘要研究了 CuO 与 吵-Al2O3 和 CeO2 的相互作用, 并由此制备出能有效脱除 CO, C3H6 和 NO 的催化剂, 考察了不同载体表面 CuO 簇的分散稳定性和耐老化性能. 结果发现, 随 CuO 负载量的增加, CuO 簇因与 CeO2 载体的强相互作用而稳定存在; 而在 吵-Al2O3 表面, CuO 簇易聚集成较大的颗粒. 另一方面, 由于 CeO2 本身较差的热稳定性, 表面分散的 CuO 在 950 °C 高温处理后烧结. 因此, 基于 吵-Al2O3 载体优越的耐老化性能, 在 吵-Al2O3 载体分散 CeO2, 然后再担载 CuO, 从而得到了稳定的 CuO 簇, 所得催化剂比 CuO/吵-A12O3 和 CuO/CeO2 具有更好的催化性能和抗热老化性能.

Graphical abstractBiMnO3 perovskite displayed good catalytic activity for NH3-SCR at low temperature and had good resistance to water and SO2.Figure optionsDownload full-size imageDownload as PowerPoint slide