Catalytic Performance of One-Pot Synthesized Fe-MWW Layered Zeolites (MCM-22, MCM-36, and ITQ-2) in Selective Catalytic Reduction of Nitrogen Oxides with Ammonia

• Published in: Molecules
• Main Authors: Szymaszek-Wawryca, Agnieszka, DÍAZ MORALES, URBANO MANUEL, Samojeden, Bogdan, Motak, Monika
• Other Authors: National Science Centre, Polonia, Agencia Estatal de Investigación, AGH University of Science and Technology, Polonia
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2022
• Subjects: MWW zeolites; Iron catalysts; One-pot synthesis; DeNO(x); Diaz; Morales; samojed*
• Online Access: http://hdl.handle.net/10251/193771; https://doi.org/10.3390/molecules27092983

[EN] The application of layered zeolites of MWW topology in environmental catalysis has attracted growing attention in recent years; however, only a few studies have explored their performance in selective catalytic reduction with ammonia (NH3-SCR). Thus, our work describes, for the first time, the one-pot synthesis of Fe-modified NH3-SCR catalysts supported on MCM-22, MCM-36, and ITQ-2. The calculated chemical composition of the materials was Si/Al of 30 and 5 wt.% of Fe. The reported results indicated a correlation between the arrangement of MWW layers and the form of iron in the zeolitic structure. We have observed that one-pot synthesis resulted in high dispersion of Fe3+ sites, which significantly enhanced low-temperature activity and prevented N2O generation during the reaction. All of the investigated samples exhibited almost 100% NO conversion at 250 degrees C. The most satisfactory activity was exhibited by Fe-modified MCM-36, since 50% of NO reduction was obtained at 150 degrees C for this catalyst. This effect can be explained by the abundance of isolated Fe3+ species, which are active in low-temperature NH3-SCR. Additionally, SiO2 pillars present in MCM-36 provided an additional surface for the deposition of the active phase. Agnieszka Szymaszek-Wawryca gratefully acknowledges the financial support of the research from the National Science Centre Grant, Preludium 19 (no. 2020/37/N/ST5/00186). Monika Motak would like to kindly acknowledge AGH Grant "Excellence Initiative-Research University" (no. 501.696.7996) for the financial support. Bogdan Samojeden is thankful to AGH Grant (no. 16.16.210.476) for the foundation of the publication. Urbano Diaz acknowledges the support from the Government of Spain through the project PID2020-112590GB-C21/AEI/10.13039/501100011033. Szymaszek-Wawryca, A.; Díaz Morales, UM.; Samojeden, B.; Motak, M. (2022). Catalytic Performance of One-Pot Synthesized Fe-MWW Layered Zeolites (MCM-22, MCM-36, and ITQ-2) in Selective Catalytic Reduction of Nitrogen Oxides with ...