Mesoporous silica containing sulfonic acid groups as catalysts for alpha-pinene methoxylation
The methoxylation of a-pinene was studied over sulfonic acid-functionalized mesoporous silica (MCM-41, PMO) at 60ºC. The support functionalization was achieved by the introduction of 3-(mercaptopropyl)trimethoxysilane onto the surface of these materials either by grafting or by co-condensation. The...
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| Other Authors: | , , , |
| Format: | article |
| Language: | por |
| Published: |
2012
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10174/6558 |
| Country: | Portugal |
| Oai: | oai:dspace.uevora.pt:10174/6558 |
| Summary: | The methoxylation of a-pinene was studied over sulfonic acid-functionalized mesoporous silica (MCM-41, PMO) at 60ºC. The support functionalization was achieved by the introduction of 3-(mercaptopropyl)trimethoxysilane onto the surface of these materials either by grafting or by co-condensation. The thiol groups were oxidized to SO3H by treatment with H2O2. All the catalysts were active in the studied reaction being the PMO-SO3H-g the best one. Good values of selectivity to a-terpinyl methyl ether were obtained with these catalysts. Catalytic stability of the PMO-SO3H-g was evaluated by performing consecutive batch runs with the same catalyst sample. After the third batch it was observed a stabilisation of the activity. |
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