Mesoporous silica supported LaCoO3 perovskites as catalysts for methane oxidation
| Autor: | Serge Kaliaguine, S. V. Nguyen, V Szabo, D. Trong On |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Inorganic chemistry
Oxide General Chemistry Mesoporous silica Condensed Matter Physics law.invention chemistry.chemical_compound Mesoporous organosilica chemistry Chemical engineering Lanthanum oxide Mechanics of Materials law Specific surface area General Materials Science Calcination Mesoporous material Perovskite (structure) |
| Zdroj: | Microporous and Mesoporous Materials. 54:51-61 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/s1387-1811(02)00340-2 |
| Popis: | A series of mesoporous silica supported LaCoO 3 perovskites with various La–Co oxide contents (from 10 to 50 wt.%) was synthesized by impregnation of a La–Co citrate complex with highly ordered mesoporous silica followed by calcination. The loaded catalysts were characterized by means of XRD, BET, TEM techniques and their catalytic activity was tested for complete methane oxidation. The results revealed that after calcination at 600 °C, highly dispersed LaCoO 3 perovskite was formed within the pore channels of the mesoporous host. No La-oxide and Co-oxide phases were detected by XRD. The specific surface area, pore volume and pore diameter of the loaded samples gradually decreased with increasing LaCoO 3 content. These catalysts displayed high specific surface area and good thermal stability. They showed catalytic activities and resistance to SO 2 poisoning in the complete methane oxidation higher than bulk LaCoO 3 perovskites. However, an internal diffusion control was observed at high temperature (conversion >40%), as a result of the one dimensional mesopore channels of the supports. |
| Databáze: | OpenAIRE |
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