Journal
CATALYSIS LETTERS
Volume 131, Issue 3-4, Pages 545-551Publisher
SPRINGER
DOI: 10.1007/s10562-009-9937-7
Keywords
Chichibabin condensation; ZSM-5; Pyridine bases; Hydrogen; Deactivation
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Funding
- Natural Science Foundation of China [20425619, 20736007]
- Program of Introducing Talents to the University Disciplines [B06006]
- Changjiang Scholars and Innovative Research Teams in Universities [IRT 0641]
- Youths Science Foundation of Wuhan Institute of Technology [Q200901]
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The effects of H-2 in the feed gasses on the Chichibabin condensation of ammonia with formaldehyde and acetaldehyde for pyridine and 3-picolines synthesis were studied in this work. It was observed that over Pt/ZSM-5 and H-ZSM-5 catalyst hydrogen can moderate the deactivation, depressed the coke formation, slightly lower the initial yield of pyridine bases and increase the selectivity of pyridine over 3-picoline. These effects cannot be simply attributed to the reactant dilution by H-2, while are similar as those of spilt-over hydrogen on a Pt/ZSM-5 catalyst on this reaction. These phenomena are taken as the evidence to support the hypothesis that molecular H-2 is activated by the pure zeolite during the Chichibabin condensation.
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