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Promoting Effect of Organic Ligand on the Performance of Ceria for the Selective Catalytic Reduction of NO by NH 3
Author(s) -
Yin Mengqi,
Qiu Wenge,
Song Liyun,
Zhu Hongtai,
Chen Yun,
Li Shining,
Cheng Jie,
Sun Yanming,
Bai Guangmei,
Zhang Guizhen,
He Hong
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800088
Subject(s) - catalysis , x ray photoelectron spectroscopy , fourier transform infrared spectroscopy , temperature programmed reduction , selective catalytic reduction , microstructure , thermogravimetric analysis , infrared spectroscopy , thermal desorption spectroscopy , adsorption , raman spectroscopy , materials science , desorption , adipic acid , inorganic chemistry , chemistry , chemical engineering , crystallography , organic chemistry , polymer chemistry , physics , optics , engineering
Two CeO 2 catalysts were fabricated by dry ball milling in the absence or presence of organic ligand, denoted as CeO 2 ‐A and CeO 2 ‐B, respectively, and tested for selective catalytic reduction of NO by NH 3 (NH 3 ‐SCR). It was found that the CeO 2 ‐B catalyst exhibited high NH 3 ‐SCR activities as well as high SO 2 and H 2 O resistance. The characterizations of nitrogen adsorption (BET), X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), Raman spectroscopy, temperature‐programmed reduction (H 2 ‐TPR), temperature‐programmed desorption (SO 2 ‐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 CeO 2 catalyst, which played important roles in enhancing NH 3 ‐SCR performance. Meanwhile, the interaction between SO 2 and CeO 2 under different condition was investigated in detail by in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) and SO 2 ‐TPD. The data suggested that the high resistance to SO 2 poisoning of CeO 2 ‐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.