Amination of dimethyl ether on zeolite catalysts. 2. Acidic properties of the used T-zeolites and their influence on the catalytic reaction

Freshly prepared and used H/Na, K-T-zeolite catalysts for the conversion of dimethyl ether and ammonia to the three methylamines have been characterized by temperature-programmed desorption of ammonia and IR spectroscopy. Activity and selectivity depend on the nature and number of the acid sites. Wi...

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Bibliographic Details
Published in:Catalysis Letters, Vol. 14, No. 3/4 (1992), p. 359-371
Main Author: Martin, A.
Other Involved Persons: Berndt, H. ; Wolf, U. ; Lücke, B.
Format: electronic Article
Language:English
ISSN:1572-879X
Physical Description:Online-Ressource
DOI:10.1007/BF00769674
Subjects:
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520 |a Freshly prepared and used H/Na, K-T-zeolite catalysts for the conversion of dimethyl ether and ammonia to the three methylamines have been characterized by temperature-programmed desorption of ammonia and IR spectroscopy. Activity and selectivity depend on the nature and number of the acid sites. With time on-stream, deep alterations in the catalyst behaviour have been observed. The activity of the catalyst is decreased by blocking of active sites ≈ 5–10 h: furthermore, during an initial period hydrocarbons were formed almost exclusively on strong-acid sites. A second period is characterized by an increased "shape selectivity” observed in the distribution of the methylamines. The amination will proceed probably on left weak-acid sites and on the outer surface in a third period, however, without "shape selectivity” due to the progressive blocking of the inner catalyst surface. 
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