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The minimal H O values required for cyclohexene, a-methylstyrene, styrene, 2,4-diphenyl-4-methyl-1-pentene, 4-phenyl-1-butene, tert-butylbenzene and cumene to undergo the chosen test reactions over solid acids at 303 K have been established. The chosen reactions and the respective H O min values obtained are as follows: a-methylstyrene and styrene oligomerization (-3.3 and -5.3), 2,4-diphenyl-4-methyl-1-pentene and 4-phenyl-1-butene oligomerization and isomerization (-6.9 and -7.9), cyclohexene oligomerization (-7.8), tert-butylbenzene disproportionation (-10.8) and cumene disproportionation (-11.5). The above mentioned test reactions were used to study the acid strength of different solid acids.

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A relation between the acid strength of the active centers of sulfated alumina catalysts and the results of transformation of styrene dimers was studied. The acid strength measurements were performed according to the test reaction method using a-methylstyrene, styrene, tert-butylbenzene and cumene reactions at 2) allowed to transform them selectively (96 %) into benzene and alkylbenzenes. When the acid strength of the catalyst was higher (H O B -3.5), the selectivity of the reaction changed. The selectivity of benzene and its derivatives diminished (to 65 %) and dicyclic compounds (indane and indene derivatives) appeared (selectivity 21 %) among the reaction products.

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