In situ deposition of 0D CeO2 quantum dots on Fe2O3-containing solid waste NH3-SCR catalyst: Enhancing redox and NH3 adsorption ability

Yangfan Chen; Yuchen Zhang; Xin Feng; Jiangling Li; Weizao Liu; Shan Ren; Jian Yang; Qingcai Liu

doi:10.1016/j.wasman.2022.06.030

In situ deposition of 0D CeO₂ quantum dots on Fe₂O₃-containing solid waste NH₃-SCR catalyst: Enhancing redox and NH₃ adsorption ability

Waste Manag. 2022 Jul 15:149:323-332. doi: 10.1016/j.wasman.2022.06.030. Epub 2022 Jun 27.

Authors

Yangfan Chen¹, Yuchen Zhang¹, Xin Feng¹, Jiangling Li², Weizao Liu³, Shan Ren³, Jian Yang³, Qingcai Liu³

Affiliations

¹ College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China.
² College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China; Chongqing Key Laboratory of Vanadium-Titanium Metallurgical and New Materials, Chongqing University, Chongqing 400044, PR China. Electronic address: lijiangling@cqu.edu.cn.
³ College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China; Chongqing Key Laboratory of Vanadium-Titanium Metallurgical and New Materials, Chongqing University, Chongqing 400044, PR China.

PMID: 35772293
DOI: 10.1016/j.wasman.2022.06.030

Abstract

As NO_x has been turning into a crucial environmental problem, NH₃-SCR technology with relatively simple device, reliable operation and low secondary pollution, has become a widely used commercial and mature de-nitration technology. However, some weaknesses restricted the further application of commercialized V₂O₅-WO₃/TiO₂ NH₃-SCR catalysts, while Fe₂O₃-based catalysts have received much attention due to their high thermal stability, passable N₂ selectivity and low cost. In this study, Fe₂O₃-containing solid waste derived from Zn extraction process of electric arc furnace dust was exploited as the base material for catalyst preparing. Owing to the complementary and synergistic effect of CeO₂ and Fe₂O₃, 0D CeO₂ quantum dots (CeQDs) with fully-exposed active sites, large specific surface area, and rapid charge transfer have been introduced and deposited onto Fe₂O₃-containing solid waste nanorods. The in-situ deposition of CeQDs led to the admirable enhancement in NH₃-SCR catalytic activity, N₂ selectivity and SO₂ tolerance of the extremely low-cost Fe₂O₃ catalyst. Comprehensive characterizations and DFT calculations describing the adsorption of O₂ and NH₃ were applied to analyze the catalyst structure and further investigate the detailed relationship between structural properties and activity as well as reaction mechanism. This work provides new insights for the high-value utilization of iron-containing solid waste and a practical reference for boosting the performance of NH₃-SCR catalysts by introducing quantum dots.

Keywords: CeO(2) quantum dots; DFT calculation; Fe(2)O(3)-containing solid waste; NH(3)-SCR.