Exploration of the Mn-O Coordination Regulated Reaction Stability of Manganese Oxides in Nh3-Scr: Effect of Deposited Ammonium Nitrates

26 Pages Posted: 17 Oct 2023

See all articles by Wang Song

Wang Song

Nanjing University

Qianni Cheng

Nanjing University

Li Han

Nanjing University

Jiawei Ji

Nanjing University

Yandi Cai

Nanjing University

Wei Tan

Nanjing University

Jingfang Sun

Nanjing University

Changjin Tang

Nanjing Normal University

Lin Dong

Nanjing University

Abstract

Manganese oxide-based catalysts exhibit excellent low-temperature denitration efficiency, making them potential candidates for application. Herein, the relationship between reaction stability and phase structure for MnO2, Mn2O3 and Mn3O4 was disclosed. The NO conversion for Mn2O3 drastically reduced after 120 h reaction, while minor decline was detected for MnO2 and Mn3O4. Based on dedicate qualitative and quantitative analyses over the deposits on catalyst surface, deactivation trigged by ammonium nitrate (AN) deposition was confirmed. Different from penta-coordinated Mn4+ on MnO2 (110) and tri-coordinated Mn2+, penta-coordinated Mn4+ on Mn3O4 (101), the unique tetra-coordinated Mn3+ on Mn2O3 (200) could stabilize the nitrates and make it difficult to be removed via decomposition or reaction and accumulate continuously, which resulted in the significant deactivation. This research could not only unveil the poisoning mechanism of MnOx based catalysts, but also provide new insights into the relationship between the catalytic stability and surface Mn-O microstructure.

Keywords: Low-temperature NH3-SCR, reaction stability, MnOx catalysts, deposited ammonium nitrates, coordination configuration

Suggested Citation

Song, Wang and Cheng, Qianni and Han, Li and Ji, Jiawei and Cai, Yandi and Tan, Wei and Sun, Jingfang and Tang, Changjin and Dong, Lin, Exploration of the Mn-O Coordination Regulated Reaction Stability of Manganese Oxides in Nh3-Scr: Effect of Deposited Ammonium Nitrates. Available at SSRN: https://ssrn.com/abstract=4605254 or http://dx.doi.org/10.2139/ssrn.4605254

Wang Song

Nanjing University ( email )

Nanjing
China

Qianni Cheng

Nanjing University ( email )

Nanjing
China

Li Han

Nanjing University ( email )

Nanjing
China

Jiawei Ji

Nanjing University ( email )

Nanjing
China

Yandi Cai

Nanjing University ( email )

Nanjing
China

Wei Tan

Nanjing University ( email )

Nanjing
China

Jingfang Sun

Nanjing University ( email )

Nanjing
China

Changjin Tang

Nanjing Normal University ( email )

Ninghai Road 122, Gulou District
Nanjing, 210046
China

Lin Dong (Contact Author)

Nanjing University ( email )

Nanjing
China

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