HYPHENATED THERMAL ANALYSIS

by Evolved Gas Analysis (case 27)

TGA FTIR Analysis Service

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 Agfa-Labs’ 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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