Catalytic Performance of La0.8K0.2Fe0.7Mn0.3O3 with Pt-Substitution in B-Site for Removal of NOx and Soot
Nanocrystalline, porous, perovskite La0.8K0.2Fe0.69Mn0.3Pt0.01O3, La0.8K0.2Fe0.67Mn0.3Pt0.03O3, La0.8K0.2Fe0.65Mn0.3Pt0.05O3
catalysts were prepared by the citrate-gel process. The optimized chemical composition La0.8K0.2Fe0.67Mn0.3Pt0.03O3 has a porous structure and it shows a good activity for soot combustion, with T
20, T
50
and T
90 being 149, 367 and 409 °C, respectively. Furthermore, the La0.8K0.2Fe0.67Mn0.3Pt0.03O3-coated honeycomb ceramic device was prepared by the citrate-gel assisted dip-coating process and it has the
effect of simultaneous removal of diesel soot and nitrogen oxides at the operational temperature range of 200 to 400 °C, with a NO
x
maximum conversion rate of 21.2%. It seems that the perovskite structure benefits the activity of low Pt content due to higher contribution
of lattice oxygen and local changes in redox reaction.
Document Type: Research Article
Publication date: 01 March 2015
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