Abstract
AbstractTwo CeO2 catalysts were fabricated by dry ball milling in the absence or presence of organic ligand, denoted as CeO2‐A and CeO2‐B, respectively, and tested for selective catalytic reduction of NO by NH3 (NH3‐SCR). It was found that the CeO2‐B catalyst exhibited high NH3‐SCR activities as well as high SO2 and H2O resistance. The characterizations of nitrogen adsorption (BET), X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), Raman spectroscopy, temperature‐programmed reduction (H2‐TPR), temperature‐programmed desorption (SO2‐TPD) and X‐ray photoelectron spectroscopy (XPS) revealed that the addition of adipic acid in the synthetic procedure leaded to a high reducibility of cerium species and a special surface microstructure, including relative high surface defects and hierarchical pore structure of the CeO2 catalyst, which played important roles in enhancing NH3‐SCR performance. Meanwhile, the interaction between SO2 and CeO2 under different condition was investigated in detail by in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) and SO2‐TPD. The data suggested that the high resistance to SO2 poisoning of CeO2‐B could be explained by a low amount of sulfur species formation and a low speed transformation of sulfites to sulfates on the ceria catalyst due to its special surface microstructure.
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