One-step 2,6-lutidine synthesis from acetone, ammonia and methanol. Temperature-programmed desorption–reaction (TPDR)–mass spectrometry (MS) study

1993 ◽  
Vol 89 (24) ◽  
pp. 4381-4386
Author(s):  
Francesco P. Vatti ◽  
Lucio Forni
Keyword(s):  
Mass Spectrometry ◽  
Temperature Programmed Desorption ◽  
One Step ◽  
Temperature Programmed ◽  
Desorption Reaction

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

2019 ◽  
Vol 3 (1) ◽  
pp. 34 ◽  
Author(s):  
Nataliia Nastasiienko ◽  
Borys Palianytsia ◽  
Mykola Kartel ◽  
Mats Larsson ◽  
Tetiana Kulik
Keyword(s):  
Mass Spectrometry ◽  
Thermogravimetric Analysis ◽  
Cerium Dioxide ◽  
Temperature Programmed Desorption ◽  
Hydroxyl Groups ◽  
Surface Complexes ◽  
Desorption Mass Spectrometry ◽  
Ft Ir ◽  
Temperature Programmed ◽  
Ft Ir Spectroscopy

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.

Optimized Reactants Mixture and Products Hydrolysis in the Manganese Oxide Thermochemical Cycle

2009 ◽  
Author(s):  
Francesca Varsano ◽  
Mariangela Bellusci ◽  
Carlo Alvani ◽  
Aurelio La Barbera ◽  
Franco Padella ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Manganese Oxide ◽  
Hydrogen Evolution ◽  
Temperature Programmed Desorption ◽  
Inert Gas ◽  
Thermochemical Cycle ◽  
Temperature Programmed ◽  
Lower Temperature ◽  
Desorption Reaction ◽  
Aqueous Slurry

A novel system composed by an aqueous slurry prepared by MnO and NaOH mixture was tested for the hydrogen production in the sodium manganese oxide thermochemical cycle. The hydrogen evolution occurs at lower temperature than conventional mixtures utilized in the cycle. Experiments performed in a Temperature Programmed Desorption/Reaction apparatus (TPD/TPR) have evidenced hydrogen production around 500°C. The hydrolysis step of α-NaMnO2 has been studied and the importance to conduct hydrolysis reaction under inert gas is discussed. A manganese disproportion mechanism is hypothesized to explain the appearance of manganese (II) and manganese (IV) containing phases.

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