Disclosing the thermal reactions of aliphatic amines in the presence of TiO2 nanoparticles by multi-shot analytical pyrolysis

0545011 - ÚACH 2022 RIV NL eng J - Journal Article
Komárková, Bára - Mattonai, M. - Degano, I. - Slovák, V.
Disclosing the thermal reactions of aliphatic amines in the presence of TiO2 nanoparticles by multi-shot analytical pyrolysis.
Journal of Analytical and Applied Pyrolysis. Roč. 159, OCT (2021), č. článku 105284. ISSN 0165-2370. E-ISSN 1873-250X
R&D Projects: GA MŠMT(CZ) LM2018124; GA MŠMT(CZ) 8X20001
Institutional support: RVO:61388980
Keywords : Aliphatic amines * Analytical pyrolysis * Multi-shot pyrolysis * Reactive pyrolysis * TiO2 nanoparticles
OECD category: Inorganic and nuclear chemistry
Impact factor: 6.437, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.jaap.2021.105284

Analytical pyrolysis is a powerful tool to study the thermal behaviour of organic compounds, but relatively little information is available on the pyrolysis of amines, especially when bound to inorganic systems. In this study, we analysed aliphatic amines (propylamine, dipropylamine, tripropylamine, and tert-butylamine), both as pure compounds and bound to titania nanoparticles, using multi-shot analytical pyrolysis-gas chromatography coupled to mass spectrometry (Py-GC–MS) with a liquid nitrogen cryo-trap system. Desorption of amines was observed at 260 °C, while pyrolysis reactions were mostly observed at 600 °C. Pure amines underwent intermolecular reactions, generating heavier nitrogen-containing compounds. Conversely, amines bound to titania nanoparticles underwent loss of ammonia and hydrogen, and both inter- and intramolecular couplings generate unsaturated hydrocarbons and aromatics. Differences in the pyrolysis mechanisms were attributed to the catalytic effect of the nanoparticles. The present work provides fundamental information on the pyrolytic behaviour of aliphatic amines and on the catalytic effect of titania nanoparticles.
Permanent Link: http://hdl.handle.net/11104/0321793