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The Effect of H2 on Chichibabin Condensation Catalyzed by Pure ZSM-5 and Pt/ZSM-5 for Pyridine and 3-Picoline Synthesis

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Abstract

The effects of H2 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 H2, 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 H2 is activated by the pure zeolite during the Chichibabin condensation.

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Acknowledgments

This work has been supported by the Natural Science Foundation of China under contract numbers 20425619 and 20736007. The work has been also supported by the Program of Introducing Talents to the University Disciplines under file number B06006, the Program for Changjiang Scholars and Innovative Research Teams in Universities under file number IRT 0641 and the Youths Science Foundation of Wuhan Institute of Technology under file number Q200901.

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Jin, F., Li, Y. The Effect of H2 on Chichibabin Condensation Catalyzed by Pure ZSM-5 and Pt/ZSM-5 for Pyridine and 3-Picoline Synthesis. Catal Lett 131, 545–551 (2009). https://doi.org/10.1007/s10562-009-9937-7

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  • DOI: https://doi.org/10.1007/s10562-009-9937-7

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