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Thermal desorption in the pressure gap and at high pressure using a Micro Knudsen Effusion Cell
Authors:Keith V. Guinn  Richard K. Herz
Affiliation:(1) Chemical Engineering Group, Department of Applied Mathematics and Engineering Science, University of California, 92093-0310 San Diego, La Jolla, CA, USA
Abstract:A new method and apparatus are described for performing thermal desorption at relatively high adsorbate pressure over single crystals and over porous adsorbents and catalysts. The apparatus, a Micro Knudsen Effusion Cell, encloses a sample in a small chamber or cell and allows only a limited pumping speed from the cell. Adsorbate pressures from ultrahigh vacuum to industrial reaction pressures are attainable depending on the ratio of surface area to pumping speed.
Keywords:Thermal desorption  TPD  pressure gap  Micro Knudsen Effusion Cell
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