Gravimetric Sorption Analyzer
Gravimetric Sorption Analyzer from UHV up to 1000 bar
Linseis offers a wide range of Gravimetric Sorption Analyzers (GSA). Our integrated solution offers the ability to independently software control the pressure, temperature and gas dosing. We offer two different balance mechanisms, a mechanically connected taught band microbalance and a Magnetic Suspension Balance offering a unique hermetically sealed reactor for highly reactive gases.
A large range of reactors from -196°C to 2400°C and ultra-high vacuum to 300 bar are available. An optional TG-DSC Thermogravimetry – Differential Scanning Calorimetry measuring head allows the simultaneous determination of weight change and caloric reactions in one run.
Linseis offers the broadest range of Sorption Analyzers for numerous applications such as:
- Chemisorption/Physisorption (UHV to 1000 bar)
- Adsorption Isotherms (BET Surface Analysis)
- TPD, TPO, TPR measurements (-196 to 1800°C)
- Sorption Enthalpies (Simultaneous TG/DSC-sensor)
- In-situ Gas Analysis (FTIR, Raman, ELIF)
- Corrosive Atmospheres Magnetic Suspension Balance
Linseis GSA-Series
Gravimetric Sorption
The adsorption or desorption of various gases by materials like catalysts or porous structures is one special, but very frequently asked application on thermo-balances. In general, there are two ways of monitoring adsorption and desorption, the volumetric sorption, where a definite amount of gas is brought into a sample chamber and the pressure change provides the information, and the gravimetric sorption, where the mass change of the sample is analyzed.
With our thermo-balance series, we use the gravimetric sorption setup which is possible due to our high resolution balance cells that can monitor very small mass changes over a broad pressure range. This enables the gravimetric analyzer to analyze precisely the adsorption and desorption behavior of various materials in a temperature range from -196°C to 2400°C and a pressure range of 0.01 mbar to 300 bars.
There are a lot of advantages coming up with gravimetric sorption: If a DSC measurement system is used, there is also the possibility to detect the sorption enthalpy during the measurement, what can provide very interesting information about the adsorption process as well.
Another point is the flexibility in measurement systems and sample volumes that can be some milligram or even some gram using different sample holders. The gravimetric vapour sorption is the easier, faster and more flexible method to get information about gas adsorption, even if the accuracy of volumetric sorption can’t be reached so far.
The following devices can be used for gravimetric sorption analysis:
- GSA PT 10 (STA PT 1600)
- GSA PT 100 (MSB)
- GSA PT 1000 (STA HP)
Application areas:
- Gas Sorption Analysis
- Sorption Enthalpies (Simultaneous TG/DSC- sensor)
- Density Determination
- Gas Storage
- Zeolites
- Catalysts
- In-situ Gas Analysis (FTIR, Raman, ELIF)
- Kinetic Analysis
- Corrosive Atmospheres – Magnetic Suspension Balance
- Adsorption Isotherms (BET Surface Analysis)
- TPD, TPO, TPR measurements (-196 to 1800°C)
Measuring Ranges:
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FTIR Coupling for GSA
All LINSEIS gravimetric sorption systems can be coupled with additional analyzing tools like FTIR. In the experiment charcoal was gasified in CO2 atmosphere. Therefore the coal sample was placed in the instrument and the temperature at constant pressure of CO2 was increased. During an isothermal segment at 1100°C, a huge mass loss could be observed, which symbolizes the gasification of the bound carbon (following the equation C+CO2 2 CO).
The graphic shows the in-situ FTIR measurement during gasification of coal in a TGA system. (Sample temperature: 1100°C, pure CO2 atmosphere at a gas flow rate of 20 ml/min at 273K, 0.013 bars) The FTIR measurement was taken for 30s during the main mass loss step. The CO and CO2 signals can be clearly seen in the IR spectrum, proving the release of CO gas during the mass loss step.
