Recent developments of core-shell structured catalysts for the selective catalytic reduction of NOx with ammonia

Selective catalytic reduction of NOx with ammonia (NH3-SCR) is an efficient and established technology for removing NOx emission from anthropogenic sources. The commercial de-NOx catalysts based on V2O5-WO3/TiO2 possess some significant drawbacks limiting their applicability, including narrow operating temperature window, biotoxicity, poor hydrothermal stability and SO2/H2O intolerance. To circumvent these shortcomings, modifications of existing V2O5-WO3/TiO2 catalysts as well as development of novel catalysts have been investigated intensively. Recently, the unique properties of core-shell structures and their extensive application within, e.g. biotechnology, pharmaceutics, electrochemical cells, optics as well as catalysis have also made their use in NH3-SCR attractive. This review summarizes recent material developments and provides an up-to-date appraisal of core-shell structured catalyst design and assembly for NH3-SCR, including classification, synthesis, catalytic performance as well as structure-property relationships. The review may inspire future developments within the NH3-SCR technology leading to novel catalyst designs with improved de-NOx performance.

Automated summary

Selective catalytic reduction of NOx with ammonia (NH3-SCR) is an effective technology for reducing NOx emissions from anthropogenic sources. However, commercial de-NOx catalysts based on V2O5-WO3/TiO2 have limitations such as a narrow operating temperature window, biotoxicity, poor hydrothermal stability, and intolerance to SO2/H2O. To overcome these drawbacks, modifications of existing catalysts and the development of novel catalysts, including core-shell structures, have been extensively investigated. This review summarizes recent material developments and provides an up-to-date evaluation of core-shell structured catalyst design and assembly for NH3-SCR, which may inspire future developments with improved de-NOx performance.