ADSORPTION OF C-8-HYDROCARBONS, POTENTIAL INTERMEDIATES OF SKELETAL ISOMERIZATION OF N-BUTENE, IN THE 10-MEMBERED RING ZEOLITE

Adsorption of various octanes and octanes was studied with a 10-member ed ring molecular sieve, H-[B]ZSM-5. Adsorption of octane was very fas t, the double-branched octane diffused slowly, and the triple-branched molecules could not enter the channels of the sample. Since the 10-me mbered ring molecular sieves are the best catalysts for skeletal isome risation of n-butene, trimethylpentenes or other larger oligomers cann ot be intermediates in this reaction. By contrast, skeletal isomerisat ion of n-butane which is known to require 12-membered ring channels, c an involve a trimethylpentane-like molecule as an intermediate.