| Autor: |
N. ſilková, Jiří Čejka, Gabriela Košová, S. Ernst, Josef Kotrla |
| Rok vydání: |
2005 |
| Předmět: |
|
| DOI: |
10.1016/s0167-2991(05)80519-1 |
| Popis: |
Alkali metal exchanged zeolites ZSM-5, X and Y were characterized by adsorption of pyrrole and tested in toluene side-chain alkylation with methanol. Adsorption of pyrrole followed by FTIR spectroscopy and gravimetry indicated that there exist at least two different adsorption sites for pyrrole in these zeolites depending on the aluminum distribution in the framework. With increasing size of the alkali metal cation (Li Si /n Al ratio. The highest activities in toluene side-chain alkylation with methanol were achieved over Cs-X and Cs-Y zeolites. With Cs-ZSM-5 (n Si /n Al =14) some methylation activity was also observed. It is proposed that not only the higher electronegativity of the zeolite catalysts but also a proper distance between two neighboring Al atoms in ZSM-5 is required for the activation of the methyl group of toluene. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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