Investigation of the Dual‐Regulatory Mechanism of Zr in MnRE<sub>1‐x</sub>Zr<sub>x</sub>O<sub>2+δ</sub> Oxide Catalysts for NO Oxidation

Utilizing Diesel Oxidation Catalysts (DOC) to partially oxidize NO to NO<sub>2</sub> is a crucial step in controlling NO<sub>x</sub> emissions from diesel engines. However, enhancing both catalytic activity and hydrothermal stability remains a significant challenge. Benefiting from abundant asymmetric oxygen vacancies and increased Mn<sup>4+</sup> content, MnRE<sub>0.5</sub>Zr<sub>0.5</sub> exhibits superior NO oxidation performance (T<sub>63</sub> = 337 °C) and hydrothermal aging resistance (T<sub>52</sub> = 340 °C) compared to the undoped sample (T<sub>53</sub> = 365 °C). XPS, Raman, TPR, and XAS are employed to verify the elevation of oxygen vacancy concentration and Mn valence state modulation due to Zr introduction. Furthermore, compared to MnRE (1.36 eV), the formation energy of oxygen vacancies in MnRE<sub>0.5</sub>Zr<sub>0.5</sub> is significantly reduced (0.17 eV). This work elucidates the dual regulatory role of Zr in the Mn-RE-Zr ternary system, providing theoretical support and guidance for the design of catalysts for atmospheric pollutant purification and industrial catalysis.

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Journal
Small
Published
2024-09-06
DOI
https://doi.org/10.1002/smll.202405740
Citations
2
Primary Topic
Catalytic Processes in Materials Science
Type
article
Field-Weighted Citation Impact
0.23

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Investigation of the Dual‐Regulatory Mechanism of Zr in MnRE1‐xZrxO2+δ Oxide Catalysts for NO Oxidation

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2 citations
Small
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article

Investigation of the Dual‐Regulatory Mechanism of Zr in MnRE1‐xZrxO2+δ Oxide Catalysts for NO Oxidation

Meisheng Cui, Yongke Hou, Dongming Chen, Chong Han, Yongqi Zhang, Zheng Zhao, Juanyu Yang, Rui Chen, Xiaowei Huang, Ziteng Mao, Zihao Xu
article en
2 citations

Abstract

Utilizing Diesel Oxidation Catalysts (DOC) to partially oxidize NO to NO<sub>2</sub> is a crucial step in controlling NO<sub>x</sub> emissions from diesel engines. However, enhancing both catalytic activity and hydrothermal stability remains a significant challenge. Benefiting from abundant asymmetric oxygen vacancies and increased Mn<sup>4+</sup> content, MnRE<sub>0.5</sub>Zr<sub>0.5</sub> exhibits superior NO oxidation performance (T<sub>63</sub> = 337 °C) and hydrothermal aging resistance (T<sub>52</sub> = 340 °C) compared to the undoped sample (T<sub>53</sub> = 365 °C). XPS, Raman, TPR, and XAS are employed to verify the elevation of oxygen vacancy concentration and Mn valence state modulation due to Zr introduction. Furthermore, compared to MnRE (1.36 eV), the formation energy of oxygen vacancies in MnRE<sub>0.5</sub>Zr<sub>0.5</sub> is significantly reduced (0.17 eV). This work elucidates the dual regulatory role of Zr in the Mn-RE-Zr ternary system, providing theoretical support and guidance for the design of catalysts for atmospheric pollutant purification and industrial catalysis.

SmallVol. 20(48)
General Research Institute for Nonferrous Metals (China) (CN), Grinm Advanced Materials (China) (CN), Northeastern University (CN)
National Natural Science Foundation of China, Young Elite Scientists Sponsorship Program by Tianjin
Affordable and clean energy
Openalex Percentile: Top 51%
Catalytic Processes in Materials Science
0.23
DOISourceOpenAlex
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