Study on the catalytic denitrification performance of low-temperature NH3-SCR over LaMnO3/biochar catalyst

被引：0
|
作者：
Fan X. [1 ,2 ]
Hao L. [1 ]
Fan C. [1 ]
Li S. [1 ]
机构：
[1] State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Science, Beijing
[2] Sino Danish College, University of Chinese Academy of Science, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2023年 / 74卷 / 09期
关键词：
biochar; denitration; perovskite oxide; selective catalytic reduction; steady-state dynamics;
D O I：
10.11949/0438-1157.20230455
中图分类号：
学科分类号：
摘要：
Selective catalytic reduction with ammonia (NH3-SCR) is one of the most widely adopted technology to reduce the emission of nitrogen oxides. The activity and stability of catalyst plays a major role in the denitration process, and the increasing requirements for low working temperature, strong SO2/H2O resistance capability have stimulated the development of new type NH3-SCR catalyst. In this work, La-Mn perovskite oxide as active component and porous biochar as support were introduced to a biochar-supported catalyst, LMO/BCNA. The catalytic performance and SO2/H2O resistance of catalysts was tested in a fixed bed reactor. NO conversion achieved over 80% and N2 selectivity was over 90% within the temperature range of 100—250℃, and the highest NO conversion reached 95.8% with N2 selectivity of 95.4% at 225℃ . Compared to LMO, LMO/biochar catalyst significantly improved denitration efficiency and widened working temperature window due to the synergistic catalytic effect of biochar. The introduction of biochar carrier weakens the catalyst’s adsorption of H2O and SO2, and enhances sulfur and water resistance. The kinetic model was built based on steady-state dynamics. On the test conditions and the presence of 5% O2, the NH3-SCR reaction order with respect to NO, O2 and NH3 was 0.66, 0 and 0, respectively. Accordingly, the activation energy for LMO/BCNA was 25.52 kJ/mol, which was much lower than that for commercial vanadium-wolframium-titanium catalysts of 40—94 kJ/mol. © 2023 Chemical Industry Press. All rights reserved.
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页码：3821 / 3830
页数：9
相关论文
共 31 条
  • [11] Tuo K, Zhang P, Wang L, Et al., Perovskite catalysts for selective catalytic reduction of NO<sub>x</sub> with NH<sub>3</sub>, Journal of Huazhong Agriculture University, 39, 5, pp. 26-34, (2020)
  • [12] Tang C J, Zhang H L, Dong L., Ceria-based catalysts for low-temperature selective catalytic reduction of NO with NH<sub>3</sub>, Catalysis Science & Technology, 6, 5, pp. 1248-1264, (2016)
  • [13] Zhang R D, Yang W, Luo N, Et al., Low-temperature NH<sub>3</sub>-SCR of NO by lanthanum manganite perovskites: effect of A-/B-site substitution and TiO<sub>2</sub>/CeO<sub>2</sub> support, Applied Catalysis B: Environmental, 146, pp. 94-104, (2014)
  • [14] Zhang Z K, Zhu Z Y, Shen B X, Et al., Insights into biochar and hydrochar production and applications: a review, Energy, 171, pp. 581-598, (2019)
  • [15] Fan X X, Hao L F, Gu X Y, Et al., Low-temperature selective catalytic reduction of NO with NH<sub>3</sub> over a biochar-supported perovskite oxide catalyst, Energy & Fuels, 37, 10, pp. 7339-7352, (2023)
  • [16] Liu H P, Yin H B, Xiong S C, Et al., A pilot scale study of low-temperature De-NO<sub>x</sub> in cement furnace, China Environmental Science, 41, 7, pp. 3169-3175, (2021)
  • [17] Valdes-Solis T, Marban G, Fuertes A B., Kinetics and mechanism of low-temperature SCR of NO<sub>x</sub> with NH<sub>3</sub> over vanadium oxide supported on carbon-ceramic cellular monoliths, Industrial & Engineering Chemistry Research, 43, 10, pp. 2349-2355, (2004)
  • [18] Xing J Y, Wang C B, Huang Y L, Et al., A comprehensive exploration about the effects of O<sub>2</sub>, SO<sub>2</sub> and NO on As<sub>2</sub>O<sub>3</sub> adsorption over Cu/γ-Al<sub>2</sub>O<sub>3</sub> SCR catalyst: a DFT study, Chemical Engineering Science, 248, (2022)
  • [19] Millan R, Cnudde P, Van Speybroeck V, Et al., Mobility and reactivity of Cu<sup>+</sup> species in Cu-CHA catalysts under NH<sub>3</sub>-SCR-NO<sub>x</sub> reaction conditions: insights from AIMD simulations, JACS Au, 1, 10, pp. 1778-1787, (2021)
  • [20] Yao X J, Wang Z, Yu S H, Et al., Acid pretreatment effect on the physicochemical property and catalytic performance of CeO<sub>2</sub> for NH<sub>3</sub>-SCR, Applied Catalysis A: General, 542, pp. 282-288, (2017)
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