Micromeritics Instrument Corporation (Auto Chem1 II 2920)
Chemisorption is the adsorption of adsorbent molecules and atoms (or molecules) on the surface of a solid surface when electrons are transferred, exchanged, or shared to form an adsorbed chemical bond.
Due to the non-uniform force field on the solid surface, the atoms on the surface often have residual bonding ability. When gas molecules collide with the solid surface, they exchange, transfer, or share electrons with the surface atoms, forming adsorption of chemical bonds. effect.
Chemisorption is a very important branch in the field of material surface research. It has important applications in catalysis (especially heterogeneous catalysis), corrosion, electrolysis, crystallography, metallurgy and metallurgy. It is commonly used in the characterization of catalysts, such as metal dispersion, active metal surface area, number of acid centers and strength distribution.
H2 -TPR, CO-TPD, CO2 -TPD, H2 -TPD, NH3 -TPD, N2 -TPD, O2 -TPD, CO pulse, H2 pulse, the test temperature range is 50-800 degrees Celsius, and TCD and MS detector modes are available.
Requirement on Sample
- Bio- carbon materials are not accepted for testing. For other carbon materials , please ensure that no tar will appear under the test conditions provided. Otherwise, the sample will cause blockage of the instrument pipeline and compensation will be required.
- The test temperature range is 50-800 degrees Celsius, to ensure that the sample must be stable throughout the process , the sample itself cannot be decomposed or produce explosive, toxic and harmful gases during the temperature rise process.
- General powder samples (40-80 mesh is necessary, not too fine), the sample mass is 100-200mg; solid block, film samples need to be broken to about 0.2mm, and consider whether gas can enter the sample and the sample reacts.
- The sample quantity is related to the metal content. If the metal content is low, please improve the quality of the sample delivery as appropriate.
What is the difference between TCD detector and MS detector?
- TCD cannot distinguish between gases, and peaks will emerge only if there are changes; mass spectrometry can detect specified small molecules.