NO Reduction Reaction by Kiwi Biochar-Modified MnO2 Denitrification Catalyst: Redox Cycle and Reaction Process

Fan, Hao; Shen, Zhenxing; Wang, Xiuru; Fan, Jie; Sun, Jian; Sun, Jiaxiang

doi:10.3390/catal12080870

Open AccessArticle

NO Reduction Reaction by Kiwi Biochar-Modified MnO₂ Denitrification Catalyst: Redox Cycle and Reaction Process

by

Hao Fan

¹,

Zhenxing Shen

^1,*

,

Xiuru Wang

¹,

Jie Fan

¹,

Jian Sun

¹ and

Jiaxiang Sun

²

¹

Xi’an Key Laboratory of Solid Waste Recycling and Resource Recovery, Department of Environmental Sciences and Engineering, Xi’an Jiaotong University, Xi’an 710049, China

²

Instrumental Analysis Center of Xi’an Jiaotong University, Xi’an Jiaotong University, Xi’an 710049, China

^*

Author to whom correspondence should be addressed.

Catalysts 2022, 12(8), 870; https://doi.org/10.3390/catal12080870

Submission received: 30 June 2022 / Revised: 28 July 2022 / Accepted: 29 July 2022 / Published: 7 August 2022

(This article belongs to the Special Issue Environmental Catalysis for Air Pollution Applications)

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Abstract

NO is a major environmental pollutant. MnO₂ is often used as a denitrification catalyst with poor N₂ selectivity and weak SO₂ resistance. Kiwi twig biochar was chosen to modify MnO₂ samples by using the hydrothermal method. The NO conversion rates of the biochar-modified samples were >90% at 125–225 °C. Kiwi twig biochar made the C2MnO₂ sample with a larger specific surface area, a higher number of acidic sites and O_β/O_α molar ratio, leading to more favorable activity at high temperatures and better SO₂ resistance. Moreover, the inhibition of the NH₃ oxidation reaction and the Mn³⁺ → Mn⁴⁺ process played a crucial role in the redox cycle. What was more, Brønsted acidic sites present on the C1MnO₂ sample participate in the reaction more rapidly. This study identified the role of biochar in the reaction process and provides a reference for the wide application of biochar.

Keywords: kiwi twigs; oxygen vacancy; selective catalytic reaction; reaction process; high-value utilization

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MDPI and ACS Style

Fan, H.; Shen, Z.; Wang, X.; Fan, J.; Sun, J.; Sun, J. NO Reduction Reaction by Kiwi Biochar-Modified MnO₂ Denitrification Catalyst: Redox Cycle and Reaction Process. Catalysts 2022, 12, 870. https://doi.org/10.3390/catal12080870

AMA Style

Fan H, Shen Z, Wang X, Fan J, Sun J, Sun J. NO Reduction Reaction by Kiwi Biochar-Modified MnO₂ Denitrification Catalyst: Redox Cycle and Reaction Process. Catalysts. 2022; 12(8):870. https://doi.org/10.3390/catal12080870

Chicago/Turabian Style

Fan, Hao, Zhenxing Shen, Xiuru Wang, Jie Fan, Jian Sun, and Jiaxiang Sun. 2022. "NO Reduction Reaction by Kiwi Biochar-Modified MnO₂ Denitrification Catalyst: Redox Cycle and Reaction Process" Catalysts 12, no. 8: 870. https://doi.org/10.3390/catal12080870

APA Style

Fan, H., Shen, Z., Wang, X., Fan, J., Sun, J., & Sun, J. (2022). NO Reduction Reaction by Kiwi Biochar-Modified MnO₂ Denitrification Catalyst: Redox Cycle and Reaction Process. Catalysts, 12(8), 870. https://doi.org/10.3390/catal12080870

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NO Reduction Reaction by Kiwi Biochar-Modified MnO₂ Denitrification Catalyst: Redox Cycle and Reaction Process

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