Catalysts are used in a variety of
applications from the production of consumer goods to the protection of the
environment. Optimum design and efficient utilization of catalysts require a
thorough understanding of the surface structure and surface chemistry of the
active material.
Chemical adsorption (chemisorption) analysis techniques provide much of the
information necessary to evaluate catalyst materials in the design and
production phases, as well as after a period of use. Catalytic activity is
evaluated by measuring the amounts and types of reactive gas adsorbed. This
volume of gas, along with an understanding of the reaction stoichiometry, is
used to calculate metal dispersion, active surface area, size of crystallites,
and surface acidity.
Micromeritics instruments are specifically designed for the highly aggressive
environment present during chemisorption analysis. Internal components are
constructed of highest-quality stainless steel to prevent reactivity with most
commonly used chemisorptives. Heated manifolds, gas lines, and detectors are
provided to allow analysis with condensable vapors. Sample preparation occurs in
situ to prevent contamination prior to analysis. Samples can be prepared at high
temperatures (up to 1100 deg C) and at low pressures (<10 -5
mmHg).
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The ASAP 2020 Accelerated Surface Area and Porosimetry Analyzer
uses gas sorption techniques for research and quality control
applications. Also available is the Chemical Adsorption (“Chemisorption”)
option, which uses the static volumetric technique to determine the
percent metal dispersion, active metal surface area, size of active
particles, and surface acidity of catalyst materials.
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Micromeritics also provides a number of Chemisorption
Reference Materials for use in the above mentioned systems. Please
contact us for more information on which reference materials best apply to your
application and type of instrument.
