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Issue 11, 2017
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Constructing a three-dimensionally ordered macroporous LaCrOδ composite oxide via cerium substitution for enhanced soot abatement

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Abstract

La1−xCexCrOδ (0 ≤ x ≤ 0.3) composite oxides with three-dimensionally ordered macroporous (3DOM) structures were constructed by a colloidal crystal template method and characterized via XRD, FT-IR, FESEM, N2 adsorption–desorption, XPS, H2-TPR, and O2-TPD techniques. The catalytic performances of the as-prepared samples for soot oxidation were further evaluated. In the case of unsubstituted species, the crystal size of LaCrO3 increased with the increasing calcination temperature, which resulted in the destruction of the 3DOM structure. The introduction of Ce delayed the crystal phase transition from LaCrO4 monazite to LaCrO3 perovskite and inhibited the growth of the crystal size; thus, the collapse of the 3DOM structure was inhibited. Moreover, the concentration of active and lattice oxygen species was further enhanced. The optimization of the structure and intrinsic properties of the catalyst impels the enhancement of its catalytic performance for soot removal.

Graphical abstract: Constructing a three-dimensionally ordered macroporous LaCrOδ composite oxide via cerium substitution for enhanced soot abatement

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Publication details

The article was received on 10 Feb 2017, accepted on 13 Apr 2017 and first published on 13 Apr 2017


Article type: Paper
DOI: 10.1039/C7CY00253J
Citation: Catal. Sci. Technol., 2017,7, 2204-2212
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    Constructing a three-dimensionally ordered macroporous LaCrOδ composite oxide via cerium substitution for enhanced soot abatement

    N. Feng, C. Chen, J. Meng, G. Liu, F. Fang, J. Ding, L. Wang, H. Wan and G. Guan, Catal. Sci. Technol., 2017, 7, 2204
    DOI: 10.1039/C7CY00253J

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