Formation mechanism of yolk--shell LaMnO<sub>3</sub> microspheres prepared by P123-template and oxidation of NO

doi:10.1007/s11706-019-0451-6

Front. Mater. Sci.

2019, Vol. 13

Issue (1) : 77-86 https://doi.org/10.1007/s11706-019-0451-6

RESEARCH ARTICLE

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

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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.

Keywords perovskite yolk--shell microspheres NO oxidation

Corresponding Author(s): Li WANG

Online First Date: 29 January 2019 Issue Date: 07 March 2019

Cite this article:

Lihui WU,Qiuling JIANG,Li WANG, et al. Formation mechanism of yolk--shell LaMnO₃ microspheres prepared by P123-template and oxidation of NO[J]. Front. Mater. Sci., 2019, 13(1): 77-86.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-019-0451-6
https://academic.hep.com.cn/foms/EN/Y2019/V13/I1/77

Tab.1 Nomenclature and conditions of the catalysts prepared

Fig.1 XRD patterns of different samples.

Tab.2 Crystalline structures and particle sizes of different LaMnO₃ samples

Fig.2 SEM images of LaMnO₃ samples obtained in different P123 concentrations of (a) LM-0, (b) LM-2.0, (c) LM-2.7, (d) LM-3.0, (e) LM-4.0, and (f) LM-6.1. (g) SEM, (h) TEM and (i) HRTEM images of LM-3.0. (j) EDS result of LM-3.0. (k) TEM and (l) HRTEM images of LM-0.

Fig.3 SEM images of transitional samples in the procedure of LM-3.0: (a) dried 150 °C for 4 h; (b) calcined to 300 °C; (c) calcined to 500 °C. (d) SEM, (e) TEM and (f) HRTEM images of LM-CA-F. (g) XRD patterns of transitional samples and LM-CA-F.

Fig.4 Schematic illustration of the formation process of yolk–shell LaMnO₃ microspheres.

Fig.5 FTIR spectra of LM-3.0-700 °C (a), LM-3.0-500 °C (b), LM-3.0-300 °C (c), LM-3.0-150 °C (d), LM-CA-F-150 °C (e), and LM-0-150 °C (f).

Fig.6 TG–DTA curves of the xerogel LM-3.0 precursor.

Fig.7 (a) N₂ adsorption desorption isotherms of LM-3.0, LM-0 and LM-CA-F. (b) Pore size distributions of LM-3.0 and LM-0.

Tab.3 BET surface areas and pore parameters of LM-0 and LM-3.0

Fig.8 NO conversion over LM-0 and LM-3.0 samples.

Tab.4 Properties of LaMnO₃ perovskite catalysts in the literature and this work [²,⁴–⁵,²¹,²⁹–³⁰]

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