TY - JOUR
T1 - Surface tuning of 3DOM LaFe0.6Mg0.4O3 perovskite by acid etching to enhance catalytic performance for soot combustion
AU - Ren, Lingling
AU - Huo, Zhuobin
AU - Song, Shangzhi
AU - Yu, Haowei
AU - Tan, Bangjie
AU - Wang, Yujie
AU - Feng, Nengjie
AU - Wan, Hui
AU - Guan, Guofeng
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/8/30
Y1 - 2023/8/30
N2 - Acid etching is one of the most widely used methods for surface tuning of perovskite. In this paper, 3DOM LaFe0.6Mg0.4O3 was synthesized by a colloidal crystal template method, and was further etched by acetic acid at different times, which made the Mg element at the B-site of perovskite selectively dissolved. Through analysis of multiple characterization results, the introduction of B-site deficiency by acid etching could not only enhance oxygen vacancies, form the Fe4+/Fe3+ redox cycles on the surface of the catalyst, but also generate mesopores structure and increase the specific surface area. After acid treatment, the soot and NO oxidation performances were improved. Among all the as-prepared catalysts, 3DOM LaFe0.6Mg0.4O3 treated by acetic acid for 1 h (LFM-1) exhibited superior reducibility and better activity for soot combustion. The T50 of LFM-1 was 417 °C under 5 % O2/N2 and 500 ppm NO, and the activation energy and TOF were 66 kJ·mol−1 and 2.17 × 10-3 s−1, respectively. Herein, the strategy of introducing B-site deficient by acid treatment is an effective method to improve soot combustion activity, which might be applicable to other catalytic fields.
AB - Acid etching is one of the most widely used methods for surface tuning of perovskite. In this paper, 3DOM LaFe0.6Mg0.4O3 was synthesized by a colloidal crystal template method, and was further etched by acetic acid at different times, which made the Mg element at the B-site of perovskite selectively dissolved. Through analysis of multiple characterization results, the introduction of B-site deficiency by acid etching could not only enhance oxygen vacancies, form the Fe4+/Fe3+ redox cycles on the surface of the catalyst, but also generate mesopores structure and increase the specific surface area. After acid treatment, the soot and NO oxidation performances were improved. Among all the as-prepared catalysts, 3DOM LaFe0.6Mg0.4O3 treated by acetic acid for 1 h (LFM-1) exhibited superior reducibility and better activity for soot combustion. The T50 of LFM-1 was 417 °C under 5 % O2/N2 and 500 ppm NO, and the activation energy and TOF were 66 kJ·mol−1 and 2.17 × 10-3 s−1, respectively. Herein, the strategy of introducing B-site deficient by acid treatment is an effective method to improve soot combustion activity, which might be applicable to other catalytic fields.
KW - B-site acid etching
KW - LaFeMgO
KW - Macropores and mesopores
KW - Soot combustion
KW - Structural and surface modification
UR - http://www.scopus.com/inward/record.url?scp=85158870888&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2023.157435
DO - 10.1016/j.apsusc.2023.157435
M3 - 文章
AN - SCOPUS:85158870888
SN - 0169-4332
VL - 629
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 157435
ER -