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Received February 10, 2015
Accepted November 26, 2015
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Catalytic removal of CO and NOx using sol-gel synthesized LaB0.5Co0.5O3 (B=Cr, Mn and Cu) and LaMnxCo1.xO3 nano-perovskites

1Department of Chemical Engineering and Petroleum,, University of Tabriz, Tabriz, Iran 2Department of Applied Chemistry and Chemical Engineering, University of Tabriz, Tabriz, Iran 3, Iran 4Department of Chemistry, Faculty of Science, Urmia University, 57159, Urmia, Iran
Korean Journal of Chemical Engineering, April 2016, 33(4), 1192-1199(8), 10.1007/s11814-015-0254-0
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Abstract

Perovskite formulations of LaB0.5Co0.5O3 (B=Cr, Mn and Cu) were examined and evaluated as catalyst for reduction of NOx by CO. Among the different and various formulations, LaMn0.5Co0.5O3 showed the highest activityselectivity with 89.84% conversion of NO and 9.62% yield of N2O at 400 ℃. Therefore, more precise evaluations were implemented on LaMnxCo1-xO3 to find the optimum formulation. The LaMn0.25Co0.75O3 included the maximum performance (68.79% conversion of NO at 350 ℃ and 92.85% at 400 ℃) and N2O yield (9.01); therefore, it was selected as optimum catalyst. Characterization methods were utilized to correlate activity and physical-chemical properties. The presented activity and reducibility of catalysts were improved due to partial substitution of Co3+ by B cation. Finally, no direct relationship was found between surface area and catalyst activity. The optimum catalyst showed complete activity-selectivity higher than 450 ℃.

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