Kinetics of styrene oxidation catalyzed by Ti-ZSM-5 prepared through gas-solid isomorphous substitution

The macro-kinetics of styrene oxidation catalyzed by Ti-ZSM-5 prepared thro ugh TiCl4 gas-solid isomorphous substitution, using 30% H2O2 as oxidant, wa s studied. The effects of catalyst amount, styrene and H2O2 concentration o n the reaction rate of styrene oxidation were also investigated in details. The results showed that the reaction rate of styrene oxidation was first o rder with respect to both Ti-ZSM-5 amount and styrene concentration, and wa s 1/2 order for H2O2 concentration. The apparent activation energy E-a of 4 8.14 kJ/mol was obtained according to temperature effect on the kinetics of styrene oxidation. At the same time, phenylacetaldehyde selectivity and H2 O2 effective utilization ratio can reach 91.9% and 88.6% respectively, unde r the conditions of n (PhCH:CH2) In (H2O2) = 7.91, [Ti-ZSM-5 20 g/L, T = 34 3 K and t = 360 min.