Sb-Containing Metal Oxide Catalysts for the Selective Catalytic Reduction of NOx with NH3

Catalysts

Qingping Ke¹  Wangcheng Zhan²  Dandan Liu²  Chuchu Wang²  Li Wang²  Qian Xu²  Yanglong Guo²  Yun Guo²  MinhNgoc Ha³ 

[1] College of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China;Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China;VNU Key Laboratory of Advanced Material for Green Growth, VNU University of Science, Vietnam National University, Hanoi 100000, Vietnam;

关键词: SbCeZr;    NH₃-SCR;    active sites;    mechanism;   

DOI  :  10.3390/catal10101154

来源: DOAJ

【 摘 要 】

Sb-containing catalysts (SbZrO_x (SbZr), SbCeO_x (SbCe), SbCeZrO_x (SbCeZr)) were prepared by citric acid method and investigated for the selective catalytic reduction (SCR) of NO_x with NH₃ (NH₃-SCR). SbCeZr outperformed SbZr and SbCe and exhibited the highest activity with 80% NO conversion in the temperature window of 202–422 °C. Meanwhile, it also had good thermal stability and resistance against H₂O and SO₂. Various characterization methods, such as XRD, XPS, H₂-TPR, NH₃-TPD, and in situ diffuse reflectance infrared Fourier transform (DRIFT), were applied to understand their different behavior in NO_x removal. The presence of Sb in the metal oxides led to the difference in acid distribution and redox property, which closely related with the NH₃ adsorption and NO oxidation. Brønsted acid and Lewis acid were evenly distributed on SbCe, while Brønsted acid dominated on SbCeZr. Compared with Brønsted acid, Lewis acid was slightly active in NH₃-SCR. The competition between NH₃ adsorption and NO oxidation was dependent on SbO_x and metal oxides, which were found on SbCe while not on SbCeZr.

【 授权许可】

Unknown