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3 Flex Chemisorption

Catalyst Characterization - 3Flex Chemisorption Option

With the chemisorption option, the 3Flex is configured to perform chemical adsorption analyses that enable the researcher to obtain valuable information about the physical or chemical properties of catalysts, catalyst supports, and a variety of other materials.

Features and Benefits:

  • VCR seals provide higher levels of system cleanliness, low outgas rates, and base pressures. The result is accurate low pressure chemisorption isotherms and the ability to measure oxygen-sensitive materials
  • Standard high-precision mass flow controller provides extremely accurate, programmable gas control
  • High-temperature furnace (up to 1100 °C) provides quick and accurate ramp rates to desired temperature with precise temperature control and repeatability (±1 °C)
  • A total of twelve gas inlets allow multiple probe gases to be investigated maximizing efficiency and range of applications
  • Superior temperature control maintains accuracy and repeatability in monotonic isotherms
  • Design permits transition from chemisorption to micropore physisorption within seconds
  • New high-temperature, precision quartz cell improves accuracy and sensitivity for challenging analyses
  • Heated vapor can also be used as the adsorptive for chemical adsorption analyses
  • Kalrez, Viton, or Buna 0-rings provide maximum flexibility for chemical compatibility

NLDFT Dual Isotherm Deconvolution and Pore Size Distribution

The NLDFT Advanced PSD, Dual OFT modeling allows the user to combine the information gathered from nitrogen and carbon dioxide isotherms to deliver a full pore size distribution on materials (such as carbon slit pores) where pores of molecular sizes are present. The range of pore size analysis in this method is extended to smaller pore sizes compared to the standard nitrogen analysis. This is due to the fact that CO2 can access some very small micropores that are not accessible to N2 at cryogenic temperatures because of diffusion limitations.

Mercury Porosimetry/ Gas Adsorption Overlay

MicroActive for the 3Flex software also includes a powerful utility that allows you to overlay a mercury porosimetry pore size distribution with a pore size distribution calculated from gas adsorption isotherms. This new import function allows you to rapidly view micropore.

Superior Hardware Versatility

A twelve-inlet gas manifold and vapor dosing are standard with the chemisorption capability. Flow control during sample activation utilizes a mass flow controller (MFC) for precise and repeatable sample preparation. The MFC is included in the standard chemisorption hardware.

Sample Analysis Options

  • Gas selection
  • Free space measured at both ambient and analysis temperature
  • Dosing options added to the pressure table give you the ability to change the pressure increment, volume dose increment, and equilibrium interval time between data points
  • Dosing from gas inlets or vapor source
  • Repeat isotherm to analyze reversible sorption

Reported Data Includes:

  • Active metal area
  • Crystallite size
  • Irreversible and reversible sorption Monolayer capacity
  • Active metal dispersion