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Carboxyl-modified colloidal crystal templates for the synthesis of three-dimensionally ordered macroporous SmMn2O5 mullite and its application in NOx-assisted soot combustion

Abstract

The strict regulation of emission levels demand the development of novel catalysts and techniques to remove soot from the exhaust gas. Three-dimensionally ordered macroporous SmMn2O5 (3DOM SMO) mullite catalysts with large pore sizes and interconnected macroporous frameworks were designed and synthesized successfully by applying the carboxyl-modified colloidal crystal templates, and tested for soot combustion reaction. The catalytic performance for soot combustion were evaluated using temperature-programmed oxidation (TPO) raction technology under “loose” contact conditions. Meanwhile, the physical and chemical properties were characterized by means of XRD, SEM, BET, XPS, O2-TPD and H2-TPR. The thermostability of polymer templates were investigated by TG measurements. The TG results and SEM images showed that the template with CPMMA-5% exhibited the desirable decomposition temperature and hexagonal close-packed structure. The 3DOM SMO prepared with CPMMA-5% as template exhibited the overall highest catalytic activity for soot combustion. The corresponding T50 was 366 °C and the CO2 selectivity was 99.5%. The O2-TPD and H2-TPR measurements indicated higher mobility and better reducibility of surface adsorbed oxygen on the 3DOM SMO sample than other specimens, leading to its enhanced catalytic performance.

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Publication details

The article was received on 10 Aug 2018, accepted on 09 Oct 2018 and first published on 10 Oct 2018


Article type: Paper
DOI: 10.1039/C8CY01663A
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Carboxyl-modified colloidal crystal templates for the synthesis of three-dimensionally ordered macroporous SmMn2O5 mullite and its application in NOx-assisted soot combustion

    Y. Chen, C. Du, Y. Lang, L. Jia, R. Chen and B. Shan, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01663A

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