Accession Number:

AD0700981

Title:

SORPTION PUMPING OF HYDROGEN BY CRYODEPOSITS-PREDICTION OF SORPTION CAPACITY

Descriptive Note:

Final rept. Apr-Sep 1969

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN

Personal Author(s):

• Tempelmeyer, K. E.

Report Date:

1970-02-01

Pagination or Media Count:

39.0

Abstract:

The applicability of several existing adsorption theories for predicting the equilibrium isotherms for the sorption of hydrogen H2 by carbon dioxide CO2 cryodeposits has been examined in the pressure range from 10 to the - 8th power to 10 to the -3rd power torr. It is demonstrated that the H2 sorption capacity of CO2 frost cryosorbents at temperatures between 12 and 20K may be accurately predicted by an equilibrium isotherm equation proposed by Dubinin and Radushkevich. This equation is then used to calculate families of sorption isotherms for CO2 frosts formed at various conditions and consequently having different structures. These results may be used to estimate the H2 capacity of cryosorption pumping systems which would employ CO2 frost as a cryosorbent.

Descriptors:

• *CRYOPUMPING
• *HYDROGEN
• CARBON DIOXIDE
• MATHEMATICAL PREDICTION
• POTENTIAL THEORY
• SORPTION

Subject Categories:

• Physical Chemistry
• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE