Abstract

Activated carbon with its large surface area has extraordinary adsorptive capabilities through physical adsorption. Using this property a project on development of cryoadsorption Cryopump is ongoing at Institute for Plasma Research (IPR), India. Under the project, to study the desorption characteristics of various sorbents; a DeGassing Measurement System (DGMS) was set up. The DGMS facility works under vacuum environment with additional feature of baking to higher temperatures. DGMS provides accurate and sensitive measurements of weight change, with one microgram sensitivity, for a various samples (Activated carbon granules of different mesh sizes, Activated carbon spheres, Activated carbon pellets and fabrics i.e. Non-woven and Flat Knitted) exposed to controlled environmental conditions over an extended period of time. This paper reports degassing measurement results obtained for various samples studied to show quantitative evolution of the gases during vacuum and heating.

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