Selective catalytic reduction of NOx with NH3 over Mn-Ce mixed oxide catalyst at low temperatures

• Published in: Catalysis today 2013-11, Vol.216, p.76-81
• Main Authors: Liu, Zhiming, Yi, Yang, Zhang, Shaoxuan, Zhu, Tianle, Zhu, Junzhi, Wang, Jinggang
• Format: Article
• Language: English
• Subjects: adsorption; ammonia; Catalysis; catalysts; catalytic activity; Chemistry; Exact sciences and technology; General and physical chemistry; In situ DRIFTS; Mn-Ce mixed oxide; NOx; Preparation method; Selective catalytic reduction; surface area; temperature; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2013.06.009

•Catalyst for the selective reduction of NOx with NH3 at low temperatures.•Mn-Ce mixed oxide prepared by the surfactant-template (ST) method is more active.•More reactive NH3 species formed on Mn-Ce catalyst prepared by the ST method.•NOx adsorption and activation was promoted on Mn-Ce catalyst prepared by the ST method. A series of Mn-Ce mixed oxide catalysts with different molar ratio of Mn/Ce were prepared by the surfactant-template (ST) method and conventional co-precipitation (CP) method for the selective catalytic reduction of NOx with ammonia (NH3-SCR) at low temperatures. Catalyst preparation method exerts significant influence on the catalytic performance, and Mn-Ce mixed oxide catalyst prepared by ST method is more active than that prepared by CP method. The best Mn-Ce mixed oxide catalyst prepared by ST method yielded nearly 100% NOx conversion in the temperature range of 100–200°C. Moreover, its resistance against H2O and SO2 is higher. The high surface area of Mn-Ce mixed oxide catalyst prepared by the ST method could contribute to the adsorption and activation of NH3 as well as NOx, thus promoting the NOx reduction to proceed.