Abstract
This work illustrates a novel application of the thermal desorption spectroscopy technique to investigate adsorption, desorption, and surface diffusion phenomena on small zeolite crystals. Ultrahigh-vacuum procedures employed with zeolite samples of very small mass permit measurements to be made without the presence of intergranular diffusion effects. Studies of 1-butene and C 2H 4 adsorption have been carried out. A diffusion energy of ~2.7 kcal/mole has been measured for 1-butene on zeolite-X; for C 2H 4 the measured diffusion energy is ~1.9 kcal/mole. The desorption energy for C 2H 4 on zeolite-X is kinetically measured to be 8.9 kcal/mole in excellent agreement with the isosteric heat of adsorption (8.9 kcal/mole). The characteristic behavior of adsorbate thermal desorption states upon annealing may be employed to discriminate between species adsorbed on the outer surface of the zeolite crystals, and species which are present within the pores of the zeolite.
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