ChemiSorb™ Series
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ChemiSorb™ Series Chemisorption Analyzers

The Versatility of the Chemisorption Technique for Catalyst Characterization Knowledge of surface chemistry and surface structure is essential in the design, production, and application of a catalytic material. The Micromeritics ChemiSorb 2720 and 2750 quickly and accurately measure the quantity of adsorbed or desorbed molecules allowing determination of these characteristics. The ChemiSorb 2720 makes chemisorption and physisorption analyses affordable for applications in which owning an instrument had once been impractical. Furthermore, if analytical needs grow, the basic system can be...

Typical ChemiSorb Applications Catalysts - The active surface area and pore structure of catalysts have great influence on reaction rates and yield of product. Limiting the pore size allows only molecules of desired sizes to enter and leave; creating a selective catalyst that will produce primarily the desired product. Chemisorption experiments are valuable for the selection of catalysts for a particular purpose, qualification of catalyst vendors, and the testing of a catalyst’s performance over time to establish when the catalyst should be reactivated or replaced. Fuel Cells -...

The Analytical Technique The ChemiSorb 2720 and 2750 both utilize the dynamic (flowing gas) technique of analysis. The quantity of gas adsorbed from the gas stream by the sample is monitored by a downstream thermal conductivity detector (TCD). The temperature and pressure at which adsorption/desorption occurs is either known or monitored. The instruments can be used to study physical or chemical adsorption. Preparation usually is accomplished by flowing either an inert or chemically active gas over the sample. After preparation, another gas is selected for analysis. Prep and carrier gases...

Four Carrier Gas Inlets ■ Push Button Selection of Carrier and Preparation Gases Sample Thermocouple ChemiSorb 2720 ChemiSorb Features 2720 2750 Sample Reactor Quartz Quartz Temperature Control Integrated 2$ 2 Standard Analyses Pulse Chemisorption Y Y ChemiSoft TPx Reports % Metal Dispersion Y Y Metal Surface Area Y Y Average Crystallite Size Y Y First Order Kinetics Y Y Single-Point Surface Area Y Y BET Multipoint Surface Area Y Y Langmuir Surface Area Y Y Total Pore Volume Y Y

The graphical reports can be customized by the user to show company logos, user-selected fonts, and user-selected line colors. ChemiSoft TPx System When the optional programmable furnace system and accompanying ChemiSoft TPx software 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...

Data are reduced and reported automatically by the ChemiSoft TPx software, which is part of the Temperature-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, crosssectional area, calculated metal density, active (metallic) surface area, active particle (crystallite) size, and activation energy (first order kinetics). Data Reduction and Reporting Versatility When used with the ChemiSorb 2750, additional reports...

The Science and Technology of Small Particles™ Micromeritics Instrument Corporation 4356 Communications Drive Norcross, GA 30093 USA Telephones: U.S.Sales (770) 662-3633 Micromeritics China - Beijing Office Room 1202. No. 1 Building Shi-Hao Ming-Di (Ten-Mansion) No. 81 Zi Zhu Yuan Rd. Hai Dian District Beijing, P.R. CHINA Code: 100089 Telephone (86)-10-68489371 Micromeritics France S.A. Parc Alata Rue Antoine Laurent Lavoisier F-60550 Verneuil en Halatte FRANCE Telephone (+33) (0)3 44 64 60 80 Micromeritics GmbH Avantis Science Park Rutherford 108 D-52072 Aachen Telephone (+49) (0) 241 189...