Gas-expanded pore MOF derived Sm/MnOx catalysts enable ultralow-temperature selective catalytic reduction of NOx

Abstract

Employing physical manipulation in macroscopic manner to achieve fine-tuning of solid mutiple-component interface and then improving of corresponding catalytic efficiency was still highly desirable but challengeable topic in design of advanced heterogeneous catalysts. Herein, a physical CO2 gas-intermediate pore-expanding strategy was deliberately integrated in the preparation of Mn-MOF precursor to facilitate the incorporation of Sm, which was employed to obtain derived Sm/MnOx catalyst with fine-tuned catalytic interface for NH3-Selective Catalytic Reduction (NH3-SCR) of NOx. Based on in-situ DRIFT analyses, DFT calculations was integrated to image that more sites exposed on the compact Sm-O-Mn interface would greatly lower the adsorption energies (Eads) for reactant and reaction intermediate. On such fine-tuned Sm-O-Mn interface, a distinct catalytic performance for NH3-SCR of NOx with 95% conversion was achieved at ultra-low temperature of 50 °C, which could be ranged in the best level compared to literature reports.