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采用TiCl4 气固相同晶取代法制得的Ti ZSM 5作催化剂 ,对H2 O2 氧化苯乙烯反应的宏观动力学进行了研究 ,考察了催化剂、苯乙烯和H2 O2 用量及反应温度对苯乙烯氧化反应速率的影响 .结果表明 ,催化剂Ti ZSM 5和底物苯乙烯对苯乙烯氧化反应速率的贡献均为一级 ,而H2 O2 为 1/ 2级 ;苯乙烯氧化反应的表观活化能Ea=48 14kJ/mol.当以丙酮为溶剂 ,在n(PhCH∶CH2 ) /n(H2 O2 ) =7 91,催化剂用量为 2 0 g/L ,反应温度为 343K的条件下 ,反应 36 0min时 ,苯乙醛选择性和H2 O2 利用率分别可达 91 9%和 88 6 % .
The kinetics of the reaction of H2O2 with styrene was investigated by TiZSM5 catalyst prepared by TiCl4 gas-solid isomorphous substitution method. The effects of the amount of catalyst, styrene and H2O2 and the reaction temperature on the oxidation rate of styrene The results show that the contributions of TiZSM 5 and styrene to styrene are one order of magnitude, while that of H 2 O 2 is 1/2. The apparent activation energy Ea of styrene oxidation is 48 14 kJ / mol. When acetone is used as the solvent, when the reaction time is 36 min at n (PhCH: CH 2) / n (H 2 O 2) = 7 91, the amount of catalyst is 20 g / L and the reaction temperature is 343K, Aldehyde selectivity and H2O2 utilization rates were 91 9% and 88 6%, respectively.