Diesel soot oxidation over Mn-Pr-Ce oxide catalysts: structural changes and the impact of Mn doping

Sunaina S. Patil; Hari Prasad Dasari; Rahulkumar Shirasangi; Harshini Dasari

doi:10.1039/d4ma00968a

Diesel soot oxidation over Mn-Pr-Ce oxide catalysts: structural changes and the impact of Mn doping

Sunaina S. Patil, Hari Prasad Dasari^*, Rahulkumar Shirasangi, Harshini Dasari^*

^*Corresponding author for this work

Department of Chemical Engineering, Manipal Institute of Technology, Manipal

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The soot oxidation activity of manganese-doped ceria-praseodymium catalysts, synthesized via solution combustion synthesis, was evaluated. The analyses performed with XRD and Raman spectroscopy indicated that the Mn-doped CP catalysts displayed the typical fluorite structure of CeO ₂. The addition of Mn to CP led to a reduction in crystallite size from 14 nm to below 10 nm. The F _2g Raman active mode of fluorite-structured Ce and the oxygen vacancies resulting from the addition of Mn and Pr (bands B 560 cm ^–1 to 580 cm ^–1) were consistently observed across all Mn-doped CP catalysts. 15 and 20 Mn-CP exhibited an additional secondary phase identified as Mn ₂O ₃. The analysis of BET surface area and BJH pore size revealed that the Mn-doped CP catalysts exhibited both micro and mesoporous characteristics. The H ₂-TPR and O ₂-TPD profiles indicated enhanced reducibility resulting from the incorporation of Mn and Pr into CeO ₂-doped catalysts. The improved T ₅₀ (365 ± 1 1C) for the 5 Mn-CP catalytic system is primarily due to its increased specific surface area of 45 m ² g ^–1 and the presence of active surface adsorbed oxygen species identified in the XPS and O ₂-TPD studies. 5 Mn-CP exhibited the lowest activation energy value compared to all other Mn-doped catalysts.

Original language	English
Pages (from-to)	1131-1143
Number of pages	13
Journal	Materials Advances
Volume	6
Issue number	3
DOIs	https://doi.org/10.1039/d4ma00968a
Publication status	Published - 13-01-2025

All Science Journal Classification (ASJC) codes

Chemistry (miscellaneous)
General Materials Science

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title = "Diesel soot oxidation over Mn-Pr-Ce oxide catalysts: structural changes and the impact of Mn doping",

abstract = "The soot oxidation activity of manganese-doped ceria-praseodymium catalysts, synthesized via solution combustion synthesis, was evaluated. The analyses performed with XRD and Raman spectroscopy indicated that the Mn-doped CP catalysts displayed the typical fluorite structure of CeO 2. The addition of Mn to CP led to a reduction in crystallite size from 14 nm to below 10 nm. The F 2g Raman active mode of fluorite-structured Ce and the oxygen vacancies resulting from the addition of Mn and Pr (bands B 560 cm –1 to 580 cm –1) were consistently observed across all Mn-doped CP catalysts. 15 and 20 Mn-CP exhibited an additional secondary phase identified as Mn 2O 3. The analysis of BET surface area and BJH pore size revealed that the Mn-doped CP catalysts exhibited both micro and mesoporous characteristics. The H 2-TPR and O 2-TPD profiles indicated enhanced reducibility resulting from the incorporation of Mn and Pr into CeO 2-doped catalysts. The improved T 50 (365 ± 1 1C) for the 5 Mn-CP catalytic system is primarily due to its increased specific surface area of 45 m 2 g –1 and the presence of active surface adsorbed oxygen species identified in the XPS and O 2-TPD studies. 5 Mn-CP exhibited the lowest activation energy value compared to all other Mn-doped catalysts.",

author = "Patil, \{Sunaina S.\} and Dasari, \{Hari Prasad\} and Rahulkumar Shirasangi and Harshini Dasari",

note = "Publisher Copyright: {\textcopyright} 2025 The Author(s)",

year = "2025",

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day = "13",

doi = "10.1039/d4ma00968a",

language = "English",

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T1 - Diesel soot oxidation over Mn-Pr-Ce oxide catalysts

T2 - structural changes and the impact of Mn doping

AU - Patil, Sunaina S.

AU - Dasari, Hari Prasad

AU - Shirasangi, Rahulkumar

AU - Dasari, Harshini

PY - 2025/1/13

Y1 - 2025/1/13

N2 - The soot oxidation activity of manganese-doped ceria-praseodymium catalysts, synthesized via solution combustion synthesis, was evaluated. The analyses performed with XRD and Raman spectroscopy indicated that the Mn-doped CP catalysts displayed the typical fluorite structure of CeO 2. The addition of Mn to CP led to a reduction in crystallite size from 14 nm to below 10 nm. The F 2g Raman active mode of fluorite-structured Ce and the oxygen vacancies resulting from the addition of Mn and Pr (bands B 560 cm –1 to 580 cm –1) were consistently observed across all Mn-doped CP catalysts. 15 and 20 Mn-CP exhibited an additional secondary phase identified as Mn 2O 3. The analysis of BET surface area and BJH pore size revealed that the Mn-doped CP catalysts exhibited both micro and mesoporous characteristics. The H 2-TPR and O 2-TPD profiles indicated enhanced reducibility resulting from the incorporation of Mn and Pr into CeO 2-doped catalysts. The improved T 50 (365 ± 1 1C) for the 5 Mn-CP catalytic system is primarily due to its increased specific surface area of 45 m 2 g –1 and the presence of active surface adsorbed oxygen species identified in the XPS and O 2-TPD studies. 5 Mn-CP exhibited the lowest activation energy value compared to all other Mn-doped catalysts.

AB - The soot oxidation activity of manganese-doped ceria-praseodymium catalysts, synthesized via solution combustion synthesis, was evaluated. The analyses performed with XRD and Raman spectroscopy indicated that the Mn-doped CP catalysts displayed the typical fluorite structure of CeO 2. The addition of Mn to CP led to a reduction in crystallite size from 14 nm to below 10 nm. The F 2g Raman active mode of fluorite-structured Ce and the oxygen vacancies resulting from the addition of Mn and Pr (bands B 560 cm –1 to 580 cm –1) were consistently observed across all Mn-doped CP catalysts. 15 and 20 Mn-CP exhibited an additional secondary phase identified as Mn 2O 3. The analysis of BET surface area and BJH pore size revealed that the Mn-doped CP catalysts exhibited both micro and mesoporous characteristics. The H 2-TPR and O 2-TPD profiles indicated enhanced reducibility resulting from the incorporation of Mn and Pr into CeO 2-doped catalysts. The improved T 50 (365 ± 1 1C) for the 5 Mn-CP catalytic system is primarily due to its increased specific surface area of 45 m 2 g –1 and the presence of active surface adsorbed oxygen species identified in the XPS and O 2-TPD studies. 5 Mn-CP exhibited the lowest activation energy value compared to all other Mn-doped catalysts.

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Diesel soot oxidation over Mn-Pr-Ce oxide catalysts: structural changes and the impact of Mn doping

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