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Thermal Transformation of Caffeic Acid on the Nanoceria Surface Studied by Temperature Programmed Desorption Mass-Spectrometry, Thermogravimetric Analysis and FT–IR Spectroscopy

1
Chuiko Institute of Surface Chemistry, NAS of Ukraine, 17 General Naumov Str., 03164 Kyiv, Ukraine
2
Stockholm University, Department of Physics, AlbaNova University Center, SE-106 91 Stockholm, Sweden
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Authors to whom correspondence should be addressed.
Colloids Interfaces 2019, 3(1), 34; https://doi.org/10.3390/colloids3010034
Received: 31 December 2018 / Revised: 22 February 2019 / Accepted: 5 March 2019 / Published: 11 March 2019
The studies of pyrolysis of caffeic acid (CA) and its surface complexes is important for the development of technologies of heterogeneous catalytic pyrolysis of plant- and wood- based renewable biomass components. In this work, the structure and thermal transformations of the surface complexes of CA on the surface of nanoceria were investigated using Fourier transform–infrared (FT–IR) spectroscopy, thermogravimetric analysis (TGA) and temperature-programmed desorption mass spectrometry (TPD MS). It was found that CA on the surface of cerium dioxide forms several types of complexes: bidentate carboxylates, monodentate carboxylates and complexes formed as a result of interaction with phenolic hydroxyl groups. This is due to the ability of nanosized cerium dioxide to generate basic hydroxyl groups that can deprotonate phenolic groups to form phenolates on the surface. The main pyrolysis products were identified. The possible ways of forming 3,4-dihydroxyphenylethylene, acetylene carboxylic acid, pyrocatechol and phenol from surface complexes of CA were suggested. It was established that on the nanoceria surface effectively occur the decarboxylation, decarbonylation, and dehydration reactions of the CA, which are the desirable processes in biomass conversion technologies. View Full-Text
Keywords: pyrolysis; biomass conversion; renewable chemistry; carboxylate complexes; phenolates; thermal transformations; pyrocatechol; hydroxybenzene pyrolysis; biomass conversion; renewable chemistry; carboxylate complexes; phenolates; thermal transformations; pyrocatechol; hydroxybenzene
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Nastasiienko, N.; Palianytsia, B.; Kartel, M.; Larsson, M.; Kulik, T. Thermal Transformation of Caffeic Acid on the Nanoceria Surface Studied by Temperature Programmed Desorption Mass-Spectrometry, Thermogravimetric Analysis and FT–IR Spectroscopy. Colloids Interfaces 2019, 3, 34.

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