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450 C over that dehydrated at 350 C. The material was also sensitive to heating in air with a reduced capacity when initially dried in air at 100 C before being fully dehydrated in a vacuum. The material was especially sensitive to heating to dehydration temperatures (350 C and higher) in air. Both Ag-LSX samples contained supercage cations in the SIII, SII, and SII* positions with the Ag-LSX-450 zeolite containing approximately 3 more SII* cations per unit cell than the Ag-LSX-350 sample. The total energy of physical adsorption, φT, is the result of the adsorbate- adsorbate interactions and adsorbate-zeolite interactions.29 The φT is comprised of dispersive (D), repulsive (R), polarization (P), field-dipole (FD) interactions, field- quadrupole (FQ) interactions, and adsorbate-adsorbate energies and can be written as follows: φT = -(φD - φR) - φP - φFD - φFQ - φAA In this case, nitrogen does not have a permanent dipole and the coverages considered here are low; therefore, the field-dipole and adsorbate-adsorbate interactions can be ignored and eq. (3) can be reduced to: (3) φT = -(φD - φR) - φP - φFQ (4) Substituting the terms for various interactions, eq. (4) can be written as: φ = − 1 Q ∂F − 1 α s F 2 − ∑ A + ∑ B (5) T 12 6 4∂r2k r r where Q is the adsorbate quadrupole moment, k is a constant (in SI units k = 9 x 109), F is the electric field, r is the distance between the adsorbate and the zeolite surface site, and αs is polarizability of the adsorbate molecule.30 The values of A, the repulsion constant, and B, the dispersion constant, may be calculated using a number of theoretical equations.1,29 27PDF Image | PSA USING SUPERIOR ADSORBENTS
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