Integration of SiC Membrane and CePO₄ Catalyst for the Simultaneous Efficient Removal of Dust and NO

Synergistic removal of nitrogen oxides (NO_x) and particulate matter (PM) can be achieved using multifunctional catalytic membranes. In this work, CePO₄ nanorods were loaded on the pore surfaces of SiC membranes to construct the CePO₄/SiC-X catalytic membranes. The stacked nanorod structure of the CePO₄ catalyst layer facilitates the diffusion of gases to the catalyst surface during reactions. Owing to the high specific surface area, rich surface acidity, and strong redox capacity, the CePO₄/SiC-400 catalytic membrane exhibits the best ammonia-selective catalytic reduction (NH₃-SCR) denitration activity, achieving >90% NO conversion at a temperature of 250-380 °C and negligible N₂O byproduct. In addition, the CePO₄/SiC-400 catalytic membrane demonstrates excellent H₂O and SO₂ resistance. The performance of dust filtration and simultaneous dust filtration and denitration at 250-350 °C proposed that the dust rejection efficiency reached more than 99% at various conditions, and the dust filtration process did not affect the NH₃-SCR performance of the CePO₄/SiC-400 catalytic membrane. From the above results, the CePO₄/SiC-400 catalytic membrane presents a broad application prospect in the simultaneous dust removal and denitration of high-temperature flue gas.