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Sorption and isomerization of cyclopropane on synthetic Faujasite by pulse techniques

Thesis/Dissertation ·
OSTI ID:6461650
Diffusion coefficients for cyclopropane and propylene on LiY, NaY, and KY zeolites at 30/sup 0/-55/sup 0/C were 1.3-5.0 x 10/sup -//sup 16/ sq m/sec, and the diffusional resistance for both gases increased in the order KY < NaY < LiY. The activation energies for diffusion were 2.0-3.7 kcal/mole for cyclopropane and 3.3-6.2 kcal/mole for propylene and increased in the order KY < NaY < LiY. Heats of adsorption were 6.1-9.3 kcal/mole and increased in the above mentioned order. The sorption capacity was 31-48 molecules per unit cell and was highest for cyclopropane on LiY zeolite. A mathematical model describing the transient behavior of a continuous-stirred tank reactor (CSTR) was applied to cyclopropane isomerization to propylene over these zeolites at 225/sup 0/-275/sup 0/C. KY was inactive, and LiY was more active than NaY. The activation energies were 16.7 kcal/mole for LiY and 23.5 kcal/mole for NaY. The intracrystalline diffusion coefficient from the CSTR method was 1.4-3.2 x 10/sup -//sup 15/ sq m/sec.
OSTI ID:
6461650
Country of Publication:
United States
Language:
English