Abstract
Thermogravimetry, together with DTA, was used to investigate sorption phenomena and surface reactions on solid catalysts. The measurements were carried out with NaX and X-type cation-exchanged zeolites and silica-alumina (Ketjen) treated with sodium hydroxide, in the presence of such hydrocarbons as isobutane, isobutene, heptane, cyclohexane, benzene, toluene, ethylbenzene, cumene,n-propylbenzene,tert-butylbenzene, biphenyl and naphthalene. On the basis of the quantitative results, it is possible to give an interpretation of the surface phenomena and to prove the existence of various active centres on the surfaces of the catalysts.
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