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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

邮发代号 80-974

2019 Impact Factor: 1.747

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Frontiers of Materials Science  2019, Vol. 13 Issue (1): 77-86   https://doi.org/10.1007/s11706-019-0451-6
  本期目录
Formation mechanism of yolk--shell LaMnO3 microspheres prepared by P123-template and oxidation of NO
Lihui WU, Qiuling JIANG, Li WANG(), Ying WANG, Mengxue WANG
School of Materials Science and Chemical Engineering, Ningbo University, No. 818, Fenghua Road, Ningbo 315211, China
 全文: PDF(4262 KB)   HTML
Abstract：

The yolk–shell LaMnO3 perovskite microspheres were fabricated by a novel, simple and mild soft template approach. A series of template-P123 concentrations (0–6.12 mmol∙L−1) were employed to optimize the most complete spheres. When the concentration of P123 is 3.0 mmol·L−1, the obtained yolk–shell microspheres with a diameter of 200–700 nm were constructed by nanoparticles. The possible formation mechanism of the yolk–shell microspheres was revealed step by step via XRD, SEM, TEM, EDS and HRTEM. Molecules of P123 were suitably mixed with solvents for double shelled vesicles through self-assembly, which interacted with metal complexes to form P123–metal vesicles. After the removal of P123 and citric acid by calcination at 700 °C, the yolk–shell LaMnO3 microspheres with through-channels were obtained. Through-channels on the surface were due to citric acid and the solid core was attributed to the shrink of inner vesicles. Prepared yolk–shell microsphere samples possessed a larger surface area and a higher maximum NO conversion value of 78% at 314 °C for NO oxidation, compared with samples without the yolk–shell structure.
Key words： perovskite    yolk--shell    microspheres    NO oxidation
收稿日期: 2018-10-14      出版日期: 2019-03-07
Corresponding Author(s): Li WANG   
 引用本文:   
. [J]. Frontiers of Materials Science, 2019, 13(1): 77-86.
Lihui WU, Qiuling JIANG, Li WANG, Ying WANG, Mengxue WANG. Formation mechanism of yolk--shell LaMnO3 microspheres prepared by P123-template and oxidation of NO. Front. Mater. Sci., 2019, 13(1): 77-86.
 链接本文:  
https://academic.hep.com.cn/foms/CN/10.1007/s11706-019-0451-6
https://academic.hep.com.cn/foms/CN/Y2019/V13/I1/77
Sample c(P123)/(mmol?L−1) n(citric acid)/mol
LM-0 – 0.02
LM-2.0 2.04 0.02
LM-2.7 2.72 0.02
LM-3.0 3.06 0.02
LM-4.0 4.08 0.02
LM-6.1 6.12 0.02
LM-CA-F 3.06 –
Tab.1  
Fig.1  
Sample Unit-cell parameters Crystal size/nm Interplanar space/nm
a/nm b/nm c/nm
LM-6.1 0.3885 0.3885 0.3885 18.2 0.2738
LM-4.0 0.3885 0.3885 0.3885 17.9 0.2744
LM-3.0 0.3883 0.3883 0.3883 17.8 0.2738
LM-2.7 0.3878 0.3878 0.3878 17.1 0.2736
LM-2.0 0.3873 0.3873 0.3873 17.9 0.2747
LM-0 0.3886 0.3886 0.3886 18.3 0.2741
Tab.2  
Fig.2  
Fig.3  
Fig.4  
Fig.5  
Fig.6  
Fig.7  
Sample Surface area/(m2·g−1) Pore size/nm Pore volume/(cm3·g−1)
LM-0 12 49 0.06
LM-3.0 15 68 0.15
Tab.3  
Fig.8  
Catalyst Preparation method Reaction condition η(NO)/% Ref.
La0.9MnO3 sol–gel method 100 ppm NO; 10% O2; 30000 h−1; 250 °C 50 [5]
LaMnO3 sol–gel method 100 ppm NO; 10% O2; 30000 h−1; 300 °C 73 [2]
La0.9Sr0.1MnO3 sol–gel method 650 ppm NO; 6% O2; 123500 h−1; 350 °C 64.9 [21]
La0.9Ca0.1MnO3 sol–gel method 100 ppm NO; 10% O2; 30000 h−1; 300 °C 82 [4]
LaMnO3 sol–gel method 400 ppm NO; 8% O2; 30000 h−1; 350 °C 62 [29]
La0.9Sr0.1MnO3 sol–gel method 400 ppm NO; 8% O2; 30000 h−1; 350 °C 62.5 [30]
LaMnO3 soft-template method 400 ppm NO; 8% O2; 30000 h−1; 314 °C 78 this work
LaMnO3 sol–gel method 400 ppm NO; 8% O2; 30000 h−1; 356 °C 56 this work
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