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The IMI-FLOW combines the static mode measurement capabilities of the full IMI range with unique dynamic (flowing) mode operation, allowing the performance of Temperature Programmed Desorption (TPD) as well as mixed gas experiments. High performance MFCs are used to regulate the flow of gas, while the integrated sample reactor heating system allows the precise control of the applied linear thermal ramp rates. Optional liquid nitrogen cryocooling allows the performance of TPD from cryogenic temperatures. In the IMI-FLOW, thermal desorption is performed into an inert carrier gas stream and detected using a downstream MFC or an optional integrated quadrupole mass spectrometer. The design of the instrument incorporates a low volume gas pathway for both a rapid response and maximum sensitivity. The addition of a dynamic sampling quadrupole mass spectrometer for evolved gas analysis, combined with multiple flow streams, also allows the performance of gas mixture and exchange experiments.
The versatile and integrated nature of the IMI-FLOW, which allows direct control of a close-coupled mass spectrometer from the IMIwin software suite, makes it a unique and sophisticated analysis system. Figure 8 A thermal desorption (TPD) spectrum showing the amount of hydrogen released from a 3 mg Pd sample hydrogenated in-situ at an elevated temperature and pressure in an IMI-FLOW. The hydrogen signal was determined using an optional dynamic sampling mass spectrometer
Figure 9 Dynamic flow experiment designed to determine the nature of selective adsorption of CO2 over CH4. The inlet and outlet CO2 flows are shown above, while CH4 flow/displacement and temperature are shown below. See Hiden Isochema Application Note 129 for more information Model IMI-FLOW.
- Sub-micromole gas sorption resolution
- High pressure operation from 77 K to 773 K
- Automatic switching between manometric and flowing mode operation
- Versatile control from standard methods to complete user-defined experiments
- Full integration of mass spectrometers from Hiden’s quadrupole range
- Gas storage
- Gas separation and purification
- Thermodynamic and kinetic studies
- Nanoporous materials (carbons, zeolites, MOFs and polymers)