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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
| Content Provider | MDPI |
|---|---|
| Author | Urbano, Díaz Szymaszek-Wawryca, Agnieszka Samojeden, Bogdan Motak, Monika |
| Copyright Year | 2022 |
| Description | 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 $(NH_{3}$-SCR). Thus, our work describes, for the first time, the one-pot synthesis of Fe-modified $NH_{3}$-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 $Fe^{3+}$ sites, which significantly enhanced low-temperature activity and prevented $N_{2}$O generation during the reaction. All of the investigated samples exhibited almost 100% NO conversion at 250 °C. The most satisfactory activity was exhibited by Fe-modified MCM-36, since 50% of NO reduction was obtained at 150 °C for this catalyst. This effect can be explained by the abundance of isolated $Fe^{3+}$ species, which are active in low-temperature $NH_{3}$-SCR. Additionally, $SiO_{2}$ pillars present in MCM-36 provided an additional surface for the deposition of the active phase. |
| Starting Page | 2983 |
| e-ISSN | 14203049 |
| DOI | 10.3390/molecules27092983 |
| Journal | Molecules |
| Issue Number | 9 |
| Volume Number | 27 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-05-06 |
| Access Restriction | Open |
| Subject Keyword | Molecules Environmental Engineering Mww Zeolites Iron Catalysts One-pot Synthesis Denox |
| Content Type | Text |
| Resource Type | Article |
