The use of ceria for the selective catalytic reduction of NOx with NH3

Abstract

The selective catalytic reduction of NOx with NH3 (NH3-SCR) is one of the widely used NOx control strategies for stationary sources (particularly for power plants) and mobile sources (particularly for diesel vehicles). The application is aimed at meeting the increasingly stringent standards for NOx emissions. Recently, ceria has attracted much attention for its applications in NH3-SCR catalysts owing to its unique redox, oxygen storage, and acid-base properties. In this article, we comprehensively review recent studies on ceria for NH3-SCR catalysts when used as support, promoter, or the main active component. In addition, the general development of ceria for NH3-SCR catalysts is discussed.

Quantum chemistry study on the oxidation of NO catalyzed by ZSM5 supported Mn/Co–Al/Ce

“…Ce has been widely used as the promoter to improve the thermal stability and catalytic activity for the transition metal oxide catalyst. 35,36 Based on the proposed three-step catalytic mechanism, the reaction processes of NO oxidation catalyzed by ZSM5-Co and ZSM5-Mn based on Al/Ce as the active T-center are calculated and obtained by the UB3LYP/SDD method. The reaction process of NO oxidation catalyzed by ZSM5-Co-Ce is shown in Fig.…”

Reaction and Characterization of Low-Temperature Effect of Transition Nanostructure Metal Codoped SCR Catalyst

“…In the pattern of 30Ce-V 2 O 5 /TiO 2 , the doped Ce exists mainly in the form of CeO 2 and part of CeVO 4 . It was found that CeO 2 can effectively improve the catalytic activity and make the reaction temperature window wider [18]. However, the formation of CeVO 4 has a certain suppression to the improvement of catalytic activity [23].…”

“…MnO has attracted significant attention because of its various types of labile oxygen species [16,17]. Recently, Ce-doped catalyst has been found to reduce the reaction temperature significantly and has high catalytic activity and selectivity [18]. Mn-doped catalyst has shown excellent lowtemperature activity, lower apparent active energy, and better ion dispersion than those of most previously reported SCR catalysts [17,19].…”

The promotion effects of TiO2 on the selective catalytic reduction of NOx with NH3 over ceo2‐WO3/ZrO2: The catalytic performance and reaction route

“…Nitrogen oxides (NO x ), derived from stationary sources (such as fossil energy plants) and mobile sources (such as diesel engines), could cause acid rain, greenhouse effects, photochemical smog, haze, and other environmental issues, all of which are harmful to the ecological environment and human health . Recently, with increasingly stringent emission standards, several techniques are employed to remove NO x .…”