In-situ fabrication of three-dimensional porous structure Mn-based catalytic filter for low-temperature NO reduction with NH3

A series of highly dispersed manganese-based catalysts coating on PPS were prepared using a novel in-situ synthesis method to enhance selective catalytic reduction of NOx with NH3 (NH3-SCR) performance. The changes of catalysts' structure, morphology, and valence state were systematically researched to explore the formation mechanism of three-dimensional (3D) porous structure. The best ternary Mn-based catalytic filter (0.6 Mn-Ce-SnOx/PPS) displayed excellent catalyst performance, achieving 100% NO conversion at 120 degrees C and above 90% conversion in a wide temperature range 100 to 180 degrees C. It can be regarded as the most excellent low-temperature de-NOx catalytic filter identified so far. It may be due to the synergistic effect between tin and cerium ions, as well as the 3D porous structure, the weak crystallization, and high ratios of Mn4+/Mn3+, Ce3+/(Ce3+ + Ce4+), and O-alpha/(O-alpha + O-beta).

Automated summary

A novel in-situ synthesis method was used to prepare highly dispersed manganese-based catalysts on PPS to enhance NOx reduction with NH3. The best Mn-based catalytic filter showed excellent performance with 100% NO conversion at 120 degrees C and over 90% conversion in a wide temperature range. The synergistic effect between tin and cerium ions, 3D porous structure, weak crystallization, and high ratios of Mn4+/Mn3+ were key factors contributing to the superior catalytic performance.