Bifunctional YFeO3-Based Catalysts Used in the Selective Catalytic Reduction of Nitrogen Monoxide in the Presence of Excess Oxygen
| Autor: | S. Kemmler-Sack, J. Lentmaier |
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| Rok vydání: | 1998 |
| Předmět: |
inorganic chemicals
Chemistry Mechanical Engineering Inorganic chemistry chemistry.chemical_element Selective catalytic reduction Condensed Matter Physics Heterogeneous catalysis Oxygen Catalysis Bifunctional catalyst chemistry.chemical_compound Mechanics of Materials General Materials Science Bifunctional NOx Perovskite (structure) |
| Zdroj: | Materials Research Bulletin. 33:461-473 |
| ISSN: | 0025-5408 |
| Popis: | The catalytic activity of YFeO3-based catalysts in the lean-NOx process was studied for the sulfated perovskite YFeO3, composites between YFeO3 and the solid acid ZrO2, as well as sulfated composites YFeO3/ZrO2. Moreover, a mechanical mixture between YFeO3 and sulfated tetragonal zirconia (t-ZrO2/SO4) was studied. It is shown that the lean-NOx activity of YFeO3 is improved by forming the composites YFeO3/ZrO2 as well as by sulfating samples, with the highest conversion rates of NOx into N2 being about 30% at about 400°C. The disadvantage of these materials is that the activity decreases with increasing the oxygen content of the feed gas. However, the mechanical mixture between YFeO3 and t-ZrO2/SO4 shows not only an improved high-temperature activity at about 400°C but also a pronounced low temperature ( |
| Databáze: | OpenAIRE |
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