This work reports the synthesis of mesoporous Ce_1-x-Zr_xO_2-δ (x = 0.5 and 0.8) mixed oxides with distinct Ce/Zr mole ratio by inverse micelle template method and their catalytic exploration for epoxidation of styrene in isopropanol solvent using TBHP as the oxidant. Among various catalysts investigated, the Ce_0.8Zr_0.2O₂ combination catalyst exhibited best catalytic activity with ~ 98% conversion and ~ 90% selectivity to styrene epoxide. The synthesized Ce–Zr mixed oxide catalysts were characterized by various state-of-the-art techniques. Characterization studies revealed that Ce/Zr mole ratio has an imperative influence on the physicochemical properties such as surface area, oxygen vacancy concentration, and redox nature. Interestingly, catalytic efficiency was significantly improved with the increase of Ce and decrease of Zr content in the Ce–Zr mixed oxides. Catalytic efficiency and distribution of the products for styrene oxidation under various conditions such as reaction time, solvent, temperature, and styrene to TBHP mole ratio were also evaluated. Reusability of the highly active Ce_0.8Zr_0.2O₂ mixed oxide catalyst was also demonstrated.

中文翻译：

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介孔的Ce-Zr混合氧化物，用于液相中苯乙烯的选择性氧化

这项工作报告了 通过逆胶束模板法合成具有不同Ce / Zr摩尔比的介孔Ce _{1- x} -Zr _x O2 _-δ（x = 0.5和0.8）混合氧化物及其催化在异丙醇溶剂中苯乙烯环氧化的探索使用TBHP作为氧化剂。在研究的各种催化剂中，Ce _0.8 Zr _0.2 O ₂混合催化剂表现出最佳的催化活性，转化率约为98％，对苯乙烯环氧化物的选择性约为90％。合成的Ce-Zr混合氧化物催化剂通过各种最新技术进行了表征。表征研究表明，Ce / Zr摩尔比对物理化学性质（如表面积，氧空位浓度和氧化还原性质）具有至关重要的影响。有趣的是，随着Ce的增加和Ce-Zr混合氧化物中Zr含量的减少，催化效率显着提高。还评估了在各种条件下（如反应时间，溶剂，温度和苯乙烯与TBHP的摩尔比），苯乙烯氧化产物的催化效率和分布。高活性Ce _0.8 Zr _0.2 O的可重用性还说明了_2种混合氧化物催化剂。