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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

Postal Subscription Code 80-974

2018 Impact Factor: 1.701

Front. Mater. Sci.    2019, Vol. 13 Issue (3) : 288-295    https://doi.org/10.1007/s11706-019-0470-3
RESEARCH ARTICLE
Ag-assisted CeO2 catalyst for soot oxidation
Lirong ZENG1, Lan CUI2, Caiyun WANG1, Wei GUO1, Cairong GONG1()
1. Institute of New Energy, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
2. Center of Analysis, Tianjin University, Tianjin 300072, China
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Abstract

In this work, the Ag loaded Ce-based catalyst was synthesized (by the sol−gel method) and its performance was studied by TG, H2-TPR, XRD, SEM, TEM, BET and XPS. The results show that Ag nanoparticles be successfully loaded onto the CeO2 surface and the relative content of Ag nanoparticles is about 10.22 wt.% close to the theoretical value (10%). XPS shows that Ag nanoparticles induce a great number of oxygen vacancies in the CeO2 lattice through the electronic transfer, and H2-TPR indicates that the Ag-assisted CeO2 catalyst exhibits a better reduction performance and Ag nanoparticles can promote O transform into O2−. The catalytic activity for soot oxidation was studied by TG under air atmosphere and the activity was found to be obviously enhanced when Ag nanoparticles be load on the surface of CeO2 (T10 = 386 °C, T90 = 472.5 °C, Tm = 431 °C). The reaction mechanism was also presented and O2 species is regarded as the determinant factor for the catalytic activity.

Keywords soot oxidation      CeO2      oxygen vacancy     
Corresponding Author(s): Cairong GONG   
Online First Date: 11 September 2019    Issue Date: 29 September 2019
 Cite this article:   
Lirong ZENG,Lan CUI,Caiyun WANG, et al. Ag-assisted CeO2 catalyst for soot oxidation[J]. Front. Mater. Sci., 2019, 13(3): 288-295.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-019-0470-3
https://academic.hep.com.cn/foms/EN/Y2019/V13/I3/288
Fig.1  Soot conversion curves over different supports: (a) TG; (b) DSC.
Catalyst T10/°C T90/°C Tm/°C
CeO2 466.5 554.5 518
AgCe 386.5 472.5 431
Tab.1  Characteristic temperatures of the two catalysts
Fig.2  H2-TPR profiles of catalysts.
Fig.3  XRD patterns of catalysts.
Catalyst w(Ag)a)/wt.% SBETb)/(m2·g−1) ([OV]/([OV] + [OL]))c)/% (Ce3+/Ce4+)c)/%
CeO2 ? 5.438 33 15.91
AgCe 9.28 9.465 46 19.75
Tab.2  The structural properties and oxygen vacancy information of catalysts
Fig.4  TEM (left) and HRTEM (right) images of (a)(b) CeO2 and (c)(d) AgCe.
Fig.5  SEM images of (a) CeO2 and (b)(c) AgCe. (d) EDS spectrum of AgCe. The element distribution mappings of (e) Ag, (f) Ce and (g) O.
Fig.6  (a) N2 adsorption–desorption isotherms and (b) pore size distributions of catalysts.
Fig.7  XPS spectra of different catalysts: (a)(b) CeO2; (c)(d) AgCe.
Fig.8  The mechanism of soot oxidation over the AgCe catalyst.
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