Integration of SiC Membrane and CePO<sub>4</sub> Catalyst for the Simultaneous Efficient Removal of Dust and NO
Jiangxiao Qiao, Jinxin Gan, Fei Gao, Xiangsen Xu, Jiesong Tan, Yiqing Zeng, Feng Zhang, Feng Han, Zhaoxiang Zhong, Weihong Xing
Abstract
Synergistic removal of nitrogen oxides (NO x ) and particulate matter (PM) can be achieved using multifunctional catalytic membranes. In this work, CePO 4 nanorods were loaded on the pore surfaces of SiC membranes to construct the CePO 4 /SiC-X catalytic membranes. The stacked nanorod structure of the CePO 4 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 CePO 4 /SiC-400 catalytic membrane exhibits the best ammonia-selective catalytic reduction (NH 3 –SCR) denitration activity, achieving >90% NO conversion at a temperature of 250–380 °C and negligible N 2 O byproduct. In addition, the CePO 4 /SiC-400 catalytic membrane demonstrates excellent H 2 O and SO 2 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 NH 3 –SCR performance of the CePO 4 /SiC-400 catalytic membrane. From the above results, the CePO 4 /SiC-400 catalytic membrane presents a broad application prospect in the simultaneous dust removal and denitration of high-temperature flue gas.