Activity and sulfur resistance enhancement of metal-based catalysts derived from layered double hydroxides for selective catalytic reduction of NOx with NH3

Abstract

NH₃ selective catalytic reduction (NH₃-SCR) over catalysts offers an effective method towards NO_x abatement at low to medium temperatures. Due to the unique structure and properties of layered double hydroxides (LDHs), metal-based catalysts derived from LDHs provide a potential solution for enhancing the catalytic activity, sulfur resistance and stability. In this review, the performance of various metal-based catalysts derived from LDHs was evaluated and summarized in terms of their ability to remove NO_x, the temperature range, N₂ selectivity, and sulfur resistance. An efficient strategy was also proposed to improve the resistance against sulfur poisoning. Given the high cost of catalysts, regeneration strategies for deactivated catalysts were also examined to prolong the lifespan. This study provided insights into the selection of a suitable method for catalyst synthesis, the design of active components, the control of electronic properties, along with the regulation of morphologies and structures for promoting the catalytic performance and sulfur resistance. LDH-derived catalysts exhibit significant potential for NH₃-SCR applications, and research in this field is encouraged.