Instruments of the RuboCAT series stand out due to their compact design and functionality, which can be customized according to specific requirements. The main features are including:
High-precision mass flow Controllers
Four thermal mass flow controllers are working within a flow range between 2 and 100 mln/min. Other flow rates are available on request.
High-pressure measurements of up to 1 MPa
The instrument is equipped with a back-pressure regulator, providing the opportunity to generate dynamic gas atmospheres of up to 1 MPa.
Humidity control included
The standard version already contains a saturator which can generate humidified gas flows. By adjusting flow rate and temperature, different levels of relative humidity can be achieved.
Highly accurate vapour dosing (option)
In addition, the instrument can be equipped with a highly accurate vapour dosing system using a HPLC pump in combination with an evaporator cell. Any condensable fluids are removed before the pressure regulator by means of an integrated cooling trap.
Wide temperature range
The reactor is temperature controlled within a range between 25 and 1100°C using heating rates of up to 25°C/min.
Pre-heated reactor inlet
Especially in high-pressure regions, the gas flow can lead to an inhomogeneous temperature distribution within the reactor. For compensation, the gas flow is preheated electrically before reaching the reactor.
Integrated TCD sensor
The standard version is already equipped with a thermal conductivity sensor being used for analysis of the dry gas composition.
Integration of mass spectrometer (option)
Additionally, the instrument can be paired with a mass spectrometer, ensuring even higher precision for analysis of the fluid composition. This optional mass spectrometer also makes the analysis of vapour fractions possible.
Temperature-programmed reduction (TPR)
TPR is used to investigate the reducibility or thermal behavior of catalysts as a function of temperature. Usually H2 is used as reductant. The figure shows the TPR data measured for a nickel oxide sample (NiO), according to:
Temperature-programmed desorption (TPD)
The binding energy of the adsorbate phase can be determined by means of a TPD measurement. A material previously loaded with adsorbate is heated under defined conditions, which leads to desorption of the previously adsorbed molecules. The desorption is detected by downstream analytics (TCD or MS).
Breakthrough curve (BTC)
The measurement of breakthrough curves is a commonly used method for the evaluation of adsorption capacity and corresponding kinetics: A gas mixture (e.g. CO2-N2) flows through an adsorber filled with the sorbent. First, the preferred adsorbing component will be adhered by the material. After saturation, the component breaks through and is detected by suitable gas analysis.