Simultaneous removal of NOx and soot particulates from diesel engine exhaust by 3DOM Fe-Mn oxide catalysts

A series of three-dimensionally ordered macroporous (3DOM) Fe-Mn oxide catalysts are prepared using the colloidal crystal template method, and their catalytic performance is tested for eliminating soot and NOx. The 3DOM Fe-1-Mn-3-O-x catalyst exhibits the highest activity for eliminating soot and NOx. The temperature of maximum CO2 concentration (T-m) for soot combustion is 435 degrees C, and that for 80% NOx conversion is 302-485 degrees C. The high catalytic activity of 3DOM Fe-1-Mn-3-O-5 is due to its abundant oxygen vacancies, excellent reducibility, and sufficient acid sites. The use of low-cost catalysts will be beneficial for practical applications. (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.