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Chemisorption Measurement

Chemisorption Lab Services

Quantachrome Instrument’s contract lab, LabQMC, offers analytical services for chemical adsorption (chemisorption) characterization of materials. Chemisorption involves the formation of strong bonds between adsorbate molecules and specific surface locations known as active sites. Chemisorption is primarily used to evaluate the number of active sites which are available to promote, or catalyze, chemical reactions. Active surface area measurements and metal dispersion measurements can be performed using either static chemisorption or pulse titration experiments (isothermal measurements). Related temperature programmed experiments (reduction –TPR, oxidation – TPO, desorption – TPD) can also be performed to determine relative ease of reduction (metal oxides), oxidation, or desorption. Activation energies for these processes can also be calculated through measurement of temperature programmed experiments at different heating rates.


Static Chemisorption Lab Services

Monolayer uptake, active metal surface area, metal dispersion, and/or crystallite size can all be determined from static chemisorption experiments. Commonly used gases include hydrogen, carbon monoxide, ammonia, carbon dioxide, and oxygen and the gas is chosen based on sample type. Static experiments include measurement of the combined, weak, and strong isotherms for determination of monolayer uptake. Customer specifies pre-treatment (often reduction) temperatures and conditions. For dispersion and crystallite size calculations, customer must also specify metal loading %.


Pulse Titration Lab Services

Monolayer uptake, active metal surface area, metal dispersion, and/or crystallite size can also all be determined from flow experiments such as pulse titration. Commonly used gases include hydrogen, carbon monoxide, ammonia, carbon dioxide, and oxygen and the gas is chosen based on sample type. N2O (nitrous oxide) is also commonly used for analysis of copper metal containing samples. Customer specifies pre-treatment (often reduction) temperatures and conditions. For dispersion and crystallite size calculations, customer must also specify metal loading %.


Temperature Programmed Reduction (TPR) Lab Services

TPR measurements are used to evaluate the relative ease of reduction of samples and are typically used to evaluate metal supported catalysts. TPR analyses can be performed up to 1100 °C and detection is done via TCD detector. Mass spectrometry detection is available for an additional fee. Customer specifies pre-treatment and analysis conditions.


Temperature Programmed Oxidation (TPO) Lab Services

TPO measurements are used to evaluate the relative ease of oxidation of samples and are typically used to evaluate carbons and redox catalysts. TPO analyses can be performed up to 1100 °C and detection is done via TCD detector. Mass spectrometry detection is available for an additional fee. Customer specifies pre-treatment and analysis conditions.


Temperature Programmed Desorption (TPD) Lab Services

TPD measurements are used to evaluate the desorption of physically and chemically bound species on a surface. Common requests include the use of ammonia desorption to evaluate the relative strength of acid sites in a material or carbon dioxide desorption to evaluate the relative strength of basic sites in a material. Another common application is the decomposition or dissociation of a material, for example, carbonate decomposition into carbon monoxide and carbon dioxide or hydrides dissociating from hydrogen storage materials. TPD analyses can be performed up to 1100 °C and detection is done via TCD detector. Mass spectrometry detection is available for an additional fee. Customer specifies pre-treatment and analysis conditions.

Chemisorption measurements are often used in the following industries:
  • Catalysts
  • Oil and Gas
  • Fuel Cell
  • Ceramics
  • Energy and Environmental
  • And many more
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Analysis Types

06007
Standard Chemisorption.

06007-H
High Resolution Chemisorption

06007-C
Customized Chemisorption

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LabQMC - 1900 Corporate Drive, Boynton Beach, FL 33426
Phone: 1-561-731-4999 l Fax 1-561-732-9888 l U.S. and Canada 1.800.989.2476
email:qmclab@quantachrome.com

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