Sorption of argon, oxygen, nitrogen, nitric oxide and carbon monoxide by hydrogen mordenite, hydrogen ZSM-5 synthetic zeolite, and sodium hydrogen mordenites
Sorption experiments carried out over a temperature range of -60 to 70/sup 8/C found sorption affinities in the order Ar par. delta O/sub 2/ << N/sub 2/ < NO < CO for both hydrogen mordenite (H-M) and hydrogen ZSM-5 (H-ZSM-5). In terms of the gas sorbability, H-M falls between Na-M and K-M, while H-ZSM-5 ranks below Cs-M. The isosteric heats of sorption, q/sub st/(kcal mol/sup -1/), of Ar, O/sub 2/, N/sub 2/, NO, and CO are 4.3, 4.4, 5.6, 5.6, and 6.9 for H-M and 3.5, 3.6, 4.3, 4.4, and 5.1 for H-ZSM-5 at the coverage, theta, of 0.02. The value of q/sub st/ of CO for a series of sodium hydrogen mordenites (NaH-M) increases with an S-shape curve with an increase in the Na content. The sums of the energies of dispersion and repulsion (E/sub D/ + E/sub R/) were calculated for H-M, H-ZSM-5, and three kinds of hypothetical zeolites having 8- to 12-membered-ring channels and compared with each other. It was concluded that the E/sub D/ + E/sub R/ values are strikingly affected by the size and shape of the zeolite channel. Comparison of the E/sub D/ + E/sub R/ values with the q/sub st/ of Ar sorbed by H-ZSM-5 suggests that the effective electric charge of the framework oxygen in H-ZSM-5 is clearly smaller than that in H-M.
- Research Organization:
- Okayama Univ., Japan
- OSTI ID:
- 6555203
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 88:9
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electron spin-echo and electron spin-resonance studies of cupric ion-adsorbate interactions in hydrogen, sodium, potassium, and calcium mordenite
Coordination and reactivity of Cu/sup 2 +/ Cations in mordenite and ZSM-5
Related Subjects
ARGON
SORPTION
CARBON MONOXIDE
MORDENITE
SORPTIVE PROPERTIES
NITRIC OXIDE
NITROGEN
OXYGEN
SODIUM COMPOUNDS
ZEOLITES
EXPERIMENTAL DATA
MEDIUM TEMPERATURE
TEMPERATURE EFFECTS
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DATA
ELEMENTS
FLUIDS
GASES
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE GASES
SILICATE MINERALS
SURFACE PROPERTIES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)