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Temperature-Programmed Chemisorption Option

ChemiSoft TPx Option

When the optional programmable furnace system and accompanying ChemiSoft TPxsoftware are added to the 2720 or the 2750, another category of chemical adsorption testing can be performed –—Temperature-programmed reactions reduction (TPR),oxidation (TPO), and desorption (TPD). 

Temperature control is provided by a furnace that operates from ambient (20 °C) to 1100 °C, and is able to produce temperature ramps of up to 50 °C/min within the 20 to 500 °C range, 30 °C/min within the 500 to 750 °C range, and up to 10 °C/min in the 750 to 1100 °C range.  The furnace controller can be programmed to provide multiple ramps and soak times.

Temperature-programmed Chemisorption

Temperature-programmed chemisorption provides information about adsorption strength when a catalyst is at working condition or at an elevated temperature.TPD analyses determine the number, type,and strength of active sites available on the surface of a catalyst from measurement of the amount of gas desorbed at various temperatures. During a TPR analysis, a metaloxide is reacted with hydrogen to form a pure metal. TPR determines the number of reducible species present in the catalyst and reveals the temperature at which reduction occurs. TPO examines the extent to which a catalyst can be reoxidized and measures the degree of reduction of certain oxides.

ChemiSoft TPx Software

Included in the Temperature-Programmed Chemisorption option is Micromeritics’ChemiSoft software that can be used to simplify chemisorption and physisorption aswell as temperature-programmed analyses.The software tracks and records time, monitors and records the analytical temperature and detector output, creates and organizes data files, reduces collected data, and produces a variety of user-defined reports. Advanced peak integration capabilities assure reliable results.

With ChemiSoft, you can create and store standard sets of analysis conditions for guiding frequently performed analyses. Analysis and prep conditions also are reported to provide a record of the environment under which the reported data were collected; this also assures faithful repeating of an experiment if required. Cut-and-paste and data export features simplify moving data to reports or incorporating chemisorption data with data from other analytical techniques.

ChemiSoft TPx software can be set up to run independently of the instrument. This means that data files can be reviewed, calculation parameters changed, and reports generated on any computer anywhere, anytime.

For the novice operator, the software features prompts for each step in the analysis process, literally talking the user through an analysis sequence. When you are ready to move up to Micromeritics’ more advanced AutoChem 2920 or ASAP 2020 Chemi, or to incorporate other Micromeritics products into your laboratory, your operators will find that the format of the operating software is the same from product to product, thus training time is minimized.

Data Reduction and ReportingVersatility     

The basic instrument without theTemperature-Programmed Chemisorptionoption provides two ways to obtain data:

  • Front panel meter readout
  • Chart recorder monitoring the analog output from the thermal conductivity detector

Data are reduced and reported automatically by the ChemiSoft TPx software, which is part of theTemperature-Programmed Chemisorption option and can be used with either ChemiSorb instrument. Reports include single- and multipoint BET surface area, percent dispersion, peak area volume, calculated stoichiometry factor, gram molecular weight, cross-sectional area, calculated metal density,active (metallic) surface area, active particle (crystallite) size, and activation energy (first order kinetics).When used with the ChemiSorb 2750, additional reports on Injection loop calibration, Injection loop volume with temperature change, and calibration error are available.

Other functions of ChemiSoft:

  • Allows control of units, axis scales, and reporting range
  • Prints report to screen, printer, or file (text only)
  • Cut-and-paste capabilities
  • Capture displayed plots as a series of x-y coordinates
  • Capture tables from screen as ASCII text files
  • Integrates detector signals both automati-cally and manually
  • Displays and prints peak graphs andreports
  • Establishes calibration curves for calculation of unknown sample concentrations
  • Reprocess stored analysis data using different parameters
  • Exports data in ASCII text format for use in other applications
  • Allows for off-line data manipulation
  • Provides the ability to monitor two instruments from one computer
  • Monitors and records furnace temperature