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 Chemisorption
In contrast to physisorption, chemical adsorption (chemisorption) involves the formation of strong bonds between adsorbate molecules and specific surface locations known as active sites. Chemisorption is used primarily to evaluate the number of surface active sites which are likely to promote (catalyze) chemical reactions. Related temperature programmed (i.e. non-isothermal) methods such as TPR, TPO and TPD are used to determine relative ease of reduction (of oxides), oxidation (of low valency species, particularly carbons) and desorption (of ammonia from acid sites for example). Activation energy for a given chemical process can be gleaned by employing different heating rates.
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Analysis Types
06007
 Standard Chemisorption.
Standard chemisorption analysis with H2, O2, CO, CO2, or NH3. Includes combined, weak and strong isotherms for determination of monolayer uptake. Report includes tabular and graphical isotherms, monolayer uptake, active metal surface, metal dispersion (%), and crystallite size. Customer provides reduction (preparation) temperature and metal loading (%) for dispersion and crystallite size calculations. 
06007-H
High Resolution ChemisorptionHigh resolution analysis chemisorption analysis with H2, O2, CO, CO2, or NH3 includes additional low pressure data. Includes combined, weak and strong isotherms for determination of monolayer uptake. Report includes tabular and graphical isotherms, monolayer uptake, active metal surface, metal dispersion (%), and crystallite size. Customer provides reduction (preparation) temperature and metal loading (%) for dispersion and crystallite size calculations. 06007-C
Customized ChemisorptionCustomized analysis, including pulse chemisorption and/or TPR/TPD (Temperature Programmed Reduction/Desorption). Multiple temperature runs to calculate activation energy and/or energy of desorption. Each run counts as one analysis. Comprehensive report provided with calculated activation energy/energy of desorption. Alternatives include at least three runs on a vacuum/volumetric system for purposes of determining isosteric heats of adsorption. Customer provides reduction (preparation) temperature. .
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