New Chemisorption Instrument at Particle Technology Labs

New at PTL – 3Flex Surface and Catalyst Characterization

Particle Technology Labs is pleased to announce the installation of our newest advanced instrument, the Micromeritics 3Flex Surface Characterization Analyzer.

The 3Flex instrument is capable of high-performance chemisorption and physisorption (mesopore and micropore) analyses with superior accuracy, resolution, and data reduction.

PTL’s model, the Micromeritics 3Flex Chemi TCD, has wide-ranging capabilities for various chemisorption methods. This includes isothermal methods (static volumetric, and dynamic or pulse chemisorption) as well as temperature programmed methods (temperature-programmed reduction or TPR, temperature-programmed oxidation or TPO, and temperature-programmed desorption or TPD). Furthermore, our instrument can also utilize an organic vapor source as the probe molecules (e.g., pyridine, isopropyl amine, methanol, etc.) in addition to standard gases (e.g., ammonia, H2, CO, etc.) most commonly used in various chemisorption analyses.

Chemisorption measurements are important for surface characterization of catalysts used in several industries including oil and gas (e.g. petroleum refining, syngas conversions, biofuel production, fuel cells), petrochemicals, fine chemicals (e.g. hydrogen production, polymers and plastics production), environmental (e.g. automotive catalytic converters, green chemistry), and many others.


Chemical adsorption, or chemisorption, is a process resulting from a chemical bond between adsorbate molecules and specific surface locations on a material, known as active sites. This interaction is much stronger than physical adsorption, or physisorption, which takes place on all surfaces if temperature and pressure conditions are favorable. Chemisorption only occurs on clean active sites and, unlike physisorption, ceases when the adsorbate can no longer make direct contact with the surface, making chemisorption a single layer process.

Chemisorption measurement techniques are useful for evaluating physical and chemical properties of materials that are critical for process / reaction performance. Primarily, chemisorption is used to evaluate the number of available active sites to increase the rate of, or catalyze, chemical reactions. Other properties can include the (reduction or oxidation) temperature at which catalysts become active, strength of specific types of active sites, or ability of materials to perform after reduction/oxidation cycles.

To read more about chemisorption, click here.
ASTM D4824, D3908
Analyses Offered

Chemisorption Tests:

  • Volumetric Chemisorption analysis
  • Dynamic or Pulse Chemisorption analysis
  • Pulse Chemisorption using liquid vapors

Temperature-Programmed Studies:

  • Temperature-Programmed Reduction (TPR)
  • Temperature-Programmed Desorption (TPD)
  • Temperature-Programmed Oxidation (TPO)

Other Chemisorption Experiments:

  • Heat of Desorption, first order Kinetics
  • Isosteric Heat of Adsorption