HYPHENATED THERMAL ANALYSIS
by Evolved Gas Analysis (case 27)
QUESTION:
Can I identify the evolved gases when gradually heating a sample ?
Thermogravimetric Analysis (TGA) directly measures weight change of a material as it is heated over a temperature range in a controlled atmosphere. Evolved gas products are generally the result of decomposition, but can also evolve from desorption, evaporation or chemical reactions.
APPROACH:
Online FTIR or MS with HiRES-TGA
Evolved gas analysis (EGA) is typically performed by interfacing a mass spectrometer (MS) or Fourier transform infrared spectrometer (FTIR) to the exit port of the TGA furnace.
See AgfaLabs’ TGA 5500 thermogravimetric analyzer with FTIR EGA.
RESULT:
Evolved Gas Analysis of Aluminum Carbide Slurry with TGA-FTIR
An aluminium carbide slurry in water dissociates in function of temperature. After the initial evaporation of water, starting at 80C, a release of methane is observed at 120C.
The amount of water and carbide can be derived from the gravimetric data.
Want to analyse evolved gasses during thermogravimetric analysis ?
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