A correlation between Hammett acidity of catalysts and their activity in temperature-programmed reaction of cumene dealkylation

On the basis of TPR spectra of cumene adsorbed on oxide catalysts, the relationship between Hammett acidity and reciprocal benzene formation temperature (H₀ = 32.50 – 18.37 10³/T_m) has been found. Using this relationship, it is possible to estimate a value of H₀ for oxide materials in an interval of –5.6 < H₀ < –16. The correlation between acidic strength of B-sites and rate constants of heterogeneous catalytic reactions is discussed.This revised version was published online in December 2005 with corrections to the Cover Date.