Abstract
By interpretation of the sequence in which perturbations or new FTIR bands appear as a function of benzene loading it is concluded that the adsorption path follows the route through the straight channels into the channel intersections and at last into the sinusoidal channels of HZSM5. FTIR-derived site-specific adsorption isotherms revealed the adsorption and saturation behavior of benzene on the hydroxyl groups of the zeolite and on the copper ions. The overall adsorption order for ZSM5 zeolites is Cu > terminal Si(OH) > internal Si(OH)Al. The benzene molecules adsorb atop of the cation or are slightly tilted. While some of the Cu(II) ions are reduced, others suffer a change of environment, and benzene cation radicals are formed. There are two copper peroxide dimers. One of them is sensitive to benzene adsorption but is not cleaved by it, as in the case of the adsorption of oxygen. The other one seems to be secluded and unable to interact either with benzene or with oxygen. The presence of Na+ ions does ...
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