Synthesis of manganese substituted hexaaluminate and its fabrication into monolithic honeycombs for catalytic combustion
| Autor: | Sung June Cho, Sun Ki Shon, Moon Hee Han, Young-Soo Ahn, Si Kyung Kim, Sung Kyu Kang |
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| Rok vydání: | 2001 |
| Předmět: |
Materials science
Mechanical Engineering Aluminate chemistry.chemical_element Catalytic combustion Manganese Condensed Matter Physics law.invention chemistry.chemical_compound Honeycomb structure chemistry Chemical engineering Mechanics of Materials law Lanthanum Honeycomb General Materials Science Calcination Composite material BET theory |
| Zdroj: | Materials Science and Engineering: A. 302:286-293 |
| ISSN: | 0921-5093 |
| Popis: | Hexaaluminate powder has been synthesized with the impregnation of La(NO 3 ) 3 and Mn(NO 3 ) 2 onto γ-Al 2 O 3 and subsequent calcination at 1400°C. The hexaaluminate powder was formed into monolithic honeycomb of 200 cpi. The results of X-ray diffraction of the samples showed that the powder and the monoliths consisted of LaAl 11 O 19 and LaAlO 3 phases. The BET surface area of the manganese substituted powder and honeycomb decreased dramatically to ∼13 m 2 g −1 at 1200°C. Further heat treatments up to 1400°C did not cause a significant reduction of the surface area, ∼7 m 2 g −1 for both sample. The bending strength of the monolithic honeycomb decreased significantly when the temperature jumped about 300°C as a thermal shock was applied. The manganese inserted as a catalyzing component in the magnetoplumbite structure allowed lean methane combustion, 1% over the honeycomb heated at 1400°C, to start at 480°C, comparable to that of the corresponding powder. |
| Databáze: | OpenAIRE |
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