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Enhancing Water Tolerance and N2 Selectivity in NH3-SCR Catalysts by Protecting Mn Oxide Nanoparticles in a
Sarah Komaty1, Marram Andijani1, Ning Wang2
1Physical Sciences and Engineering Division (PSE), KAUST Catalysis Center (KCC), Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia.
Abstract:
Mn-based catalysts are promising candidates for eliminating harmful nitrogen oxides (NO) via selective catalytic reduction with ammonia (NH3-SCR) due to their inherent strong redox abilities. However, poor water tolerance and low N2 selectivity are still the main limitations for practical applications. Herein, we succeeded in preparing an active catalyst for NH3-SCR with improved water tolerance and N2 selectivity based on protecting MnO with a secondary growth of a hydrophobic silicalite-1. This protection suppressed catalyst deactivation by water adsorption. Interestingly, impregnating MnO on MesoTS-1 followed by silicalite-1 protection allowed for a higher dispersion of MnO species, thus increasing the concentration of acid sites. Consequently, the level of N2O formation is decreased. These improvements resulted in a broader operating temperature of NO conversion and a modification of the NH3-SCR mechanism. Diffuse reflectance infrared Fourier transform spectroscopy analysis revealed that unprotected Mn/MesoTS-1 mainly followed the Eley-Rideal mechanism, while Mn/MesoTS-1@S1 followed both Langmuir-Hinshelwood and Eley-Rideal mechanisms.
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