Citation: WANG Hui-min, MA Yan-ping, CHEN Xi-ying, XU Si-yuan, CHEN Jin-ding, ZHANG Qiu-lin, ZHAO Bin, NING Ping. Promoting effect of SO₄^2- functionalization on the performance of Fe₂O₃ catalyst in the selective catalytic reduction of NO_x with NH₃[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(5): 584-593. shu

Promoting effect of SO₄^2- functionalization on the performance of Fe₂O₃ catalyst in the selective catalytic reduction of NO_x with NH₃

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China

Corresponding author: ZHANG Qiu-lin, qiulinzhang.kmust@163.com ZHAO Bin, 2859981152@qq.com
Received Date: 13 January 2020
Revised Date: 22 April 2020

Fund Project: Analysis and Testing Center of Kunming University of Science and Technology 2019M20182207001The project was supported by the National Natural Science Foundation of China (21666014) and Analysis and Testing Center of Kunming University of Science and Technology (2019M20182207001)the National Natural Science Foundation of China 21666014

Figures(10)

Fe(OH)₃ and Fe₂O₃ were first prepared by a precipitation method and then sulfated to obtain the SO₄^2--functionalized SO₄^2-/Fe(OH)₃ and SO₄^2-/Fe₂O₃ catalysts for the selective catalytic reduction of NO_x with NH₃ (NH₃-SCR); the promoting effect of SO₄^2- functionalization on the performance of Fe₂O₃ catalyst in NH₃-SCR was then investigated. The results indicate that the SCR activity of the SO₄^2--functionalized Fe₂O₃ catalysts is significantly improved in comparison with that of unmodified Fe₂O₃. In particular, the SO₄^2-/Fe(OH)₃ catalyst exhibits excellent performance in NH₃-SCR, with the NO_x conversion of over 80% at 250-450 ℃; besides, it also display high catalytic stability and resistance towards H₂O + SO₂. A series of characterization results including XRD, Raman spectroscopy, TG analysis, FT-IR spectroscopy, H₂-TPR, NH₃-TPD and in situ DRIFTS reveal that the functionalization with sulfuric acid can inhibit the growth of Fe₂O₃ grains; moreover, SO₄^2- combines with Fe³⁺ to form the sulfate complex, leading to an increase in the number of surface acid sites and the acid strength, which can inhibit the ammonia over-oxidation on Fe₂O₃ and enhance the deNO_x performance of Fe₂O₃.
- sulfation treatment,
- Fe₂O₃,
- selective catalytic reduction with NH₃,
- denitration,
- surface acidity,
- ammonia oxidation
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Promoting effect of SO42- functionalization on the performance of Fe2O3 catalyst in the selective catalytic reduction of NOx with NH3

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Promoting effect of SO₄^2- functionalization on the performance of Fe₂O₃ catalyst in the selective catalytic reduction of NO_x with NH₃