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Issue 14, 2016
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Promotional role of La addition in the NO oxidation performance of a SmMn2O5 mullite catalyst

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Abstract

A series of LaxSm1−xMn2Oδ (x = 0, 0.1, 0.3, 0.5) catalysts were synthesized through a co-precipitation method. The catalytic activity for NO oxidation was enhanced with La substitution, and the maximum activity was achieved at x = 0.3. XRD and HRTEM results revealed the formation of a multiphase oxide as well as the interface structure between the mullite (SmMn2O5) phase and Mn-rich perovskite (La0.96MnO3.05) phase. The main impact of different La/Sm molar ratios is the amount of surface adsorbed oxygen (Oads) and surface Mn4+ ions as revealed by XPS results. The NO oxidation performance was enhanced through La addition by promoting the decomposition of nitrate/nitrite species and desorption of NO2, improving the reducibility of surface adsorbed oxygen, as determined by H2-TPR, NO + O2-TPRD and in situ DRIFTS studies. Mono-, bi-dentate and bridged nitrates formed on the surface were determined to be the primary reaction intermediates.

Graphical abstract: Promotional role of La addition in the NO oxidation performance of a SmMn2O5 mullite catalyst

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Publication details

The article was received on 09 Nov 2015, accepted on 30 Mar 2016 and first published on 31 Mar 2016


Article type: Paper
DOI: 10.1039/C5CY01919B
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Catal. Sci. Technol., 2016,6, 5580-5589

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    Promotional role of La addition in the NO oxidation performance of a SmMn2O5 mullite catalyst

    Z. Feng, J. Wang, X. Liu, Y. Wen, R. Chen, H. Yin, M. Shen and B. Shan, Catal. Sci. Technol., 2016, 6, 5580
    DOI: 10.1039/C5CY01919B

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