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Frontiers of Chemical Science and Engineering

Front. Chem. Sci. Eng.    2020, Vol. 14 Issue (6) : 967-975     https://doi.org/10.1007/s11705-020-1922-0
RESEARCH ARTICLE
The preparation, characterization, and catalytic performance of porous fibrous LaFeO3 perovskite made from a sunflower seed shell template
Zhifei Wu1, Li Wang1, Yixiao Hu2, Hui Han1, Xing Li1, Ying Wang1()
1. School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
2. College of Science & Technology, Ningbo University, Cixi 315000, China
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Abstract

LaFeO3 perovskite with a porous fibrous structure was successfully synthesized using a sunflower seed shell as a template. To investigate the effects of this template, a sample was prepared without a template via the same procedure. Through various characterization techniques, such as X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, N2 adsorption-desorption analysis, X-ray photoelectron spectroscopy, oxygen temperature programed desorption, and hydrogen temperature programed reduction, the physiochemical properties of the samples were investigated. The results showed that the sample made with a template had a larger surface area and a larger amount of adsorbed oxygen, which further illustrated that the sunflower seed shell template had a significant impact on the physiochemical properties of the samples. Furthermore, we explored the catalytic activity for nitric oxide (NO) oxidation, and studied the factors affecting it, which highlighted its potential application in automobile exhausts.

Keywords NO oxidation      porous fibrous LaFeO3      sunflower seed shell     
Corresponding Author(s): Ying Wang   
Online First Date: 11 May 2020    Issue Date: 11 September 2020
 Cite this article:   
Zhifei Wu,Li Wang,Yixiao Hu, et al. The preparation, characterization, and catalytic performance of porous fibrous LaFeO3 perovskite made from a sunflower seed shell template[J]. Front. Chem. Sci. Eng., 2020, 14(6): 967-975.
 URL:  
https://journal.hep.com.cn/fcse/EN/10.1007/s11705-020-1922-0
https://journal.hep.com.cn/fcse/EN/Y2020/V14/I6/967
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Zhifei Wu
Li Wang
Yixiao Hu
Hui Han
Xing Li
Ying Wang
Fig.1  XRD patterns of the La and Lb samples.
Fig.2  FTIR spectra of the La and Lb samples.
Fig.3  SEM images of (a) a proto-ecological sunflower seed shell, (b, c, d) the La sample under different magnifications.
Fig.4  SEM images of the Lb sample under different magnifications.
Sample SBET/(m2·g1) Vp/(cm3·g1) Dp/nm
La 20.1688 0.145131 32.0916
Lb 15.0631 0.057706 18.2478
Tab.1  Textural parameters of La and Lb samples
Fig.5  Nitrogen adsorption/desorption isotherms (a) and pore size distribution (b) of the La and Lb samples.
Sample La Fe O La/Fe Fe4+/Fe3+ Oads/Olatt
La 14.69 14.17 71.14 1.04 0.981 1.12
Lb 14.56 18.52 66.92 0.79 0.967 0.93
Tab.2  Quantitative calculation results of surface elements (%) and atomic ratios for the La and Lb samples
Fig.6  (a) Fe 2p XPS spectra and (b) O 1s XPS spectra of La and Lb samples.
Fig.7  O2-TPD profiles of the La and Lb samples.
Sample Amounts of oxygen desorbed/(mmol·g1) H2 consumption/(mmol·g1)
α-Oxygen β-Oxygen γ-Oxygen 100°C?430°C 430°C?750°C
La 172.04 302.83 174.85 127.03 180.86
Lb 112.05 201.10 8.62 121.63 162.04
Tab.3  Quantitative analysis of O2-TPD and H2-TPR profiles
Fig.8  H2-TPR profiles of the La and Lb samples.
Fig.9  Catalytic oxidation performance of the La and Lb samples for NO.
Fig.10  Arrhenius plots of the La and Lb samples.
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