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Remarkable N2-selectivity enhancement of NH3-SCR over HPMo modified MnCo-BTC@SiO2 catalyst.
Ko, Songjin; Tang, Xiaolong; Gao, Fengyu; Yi, Honghong; Liu, Hengheng; Luo, Ning.
Afiliação
  • Ko S; Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; Department of Chemistry, Pyongyang University of Architecture, Pyongyang, DPR of Korea.
  • Tang X; Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: txiaolong@126.com.
  • Gao F; Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
  • Yi H; Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
  • Liu H; Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
  • Luo N; Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
J Environ Sci (China) ; 138: 482-495, 2024 Apr.
Article em En | MEDLINE | ID: mdl-38135414
ABSTRACT
In this work, the phosphomolybdate (HPMo) modification strategy was applied to improve the N2 selectivity of MnCo-BTC@SiO2 catalyst for the selective catalytic reduction of NOx, and further, the mechanism of HPMo modification on enhanced catalytic performance was explored. Among MnCo-BTC@SiO2-x catalysts with different HPMo concentrations, MnCo-BTC@SiO2-0.75 catalyst exhibited not only the highest NH3-SCR performance (∼95% at 200-300°C) but also the best N2 selectivity (exceed 80% at 100-300°C) due to the appropriate redox capacity, greater surface acidity. X-ray photoelectron spectrometer (XPS) and temperature programmed reduction of H2 (H2-TPR) results showed that the modification with HPMo reduced the oxidation-reduction performance of the catalyst due to electron transfer from Mo5+ to Mn4+/Mn3+ and prevent the excessive oxidation of ammonia adsorption species. NH3 temperature-programmed desorption of (NH3-TPD) results showed that the modification with HPMo could significantly improve the surface acidity and NH3 adsorption, which enhance the catalytic activity and N2 selectivity. In-situ diffused reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS) revealed that modification with HPMo increased significantly the amount of adsorbed NH3 species on the Bronsted acid site and CB/CL, it suppressed the production of N2O by inhibiting the production of NH species, the deep dehydrogenation of ammonia adsorption species. This study provided a simple design strategy for the catalyst to improve the low-temperature catalytic performance and N2 selectivity.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dióxido de Silício / Amônia Idioma: En Revista: J Environ Sci (China) Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dióxido de Silício / Amônia Idioma: En Revista: J Environ Sci (China) Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2024 Tipo de documento: Article
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