Abstract

Ag@CeO₂ with a rice-ball configuration as a heterogeneous and highly efficient catalyst was described for activation of H₂O₂ in the selective oxidation of aromatic and aliphatic sulfides to their corresponding sulfones. Ag nanoparticles in the CeO₂–Ag interface increase the oxygen vacancy defects on the surface of CeO₂ and oxygen vacancy defects promote the reduction of Ce⁴⁺ to Ce³⁺ to keep the electroneutrality. Generated Ce³⁺ species act as the active sites in the interface of CeO₂–Ag to promote the oxidation of sulfides to sulfones. Compatibility with various aromatic and aliphatic sulfides, excellent selectivity, high yield of product, simple experimental procedure, and mild reaction conditions are some of the precious advantages of Ag@CeO₂/H₂O₂ catalyst system.

Graphic abstract

中文翻译：

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具有“饭团”构型的Ag @ CeO 2纳米颗粒，是一种有效的多相纳米催化剂，用于将硫化物选择性氧化为含30％H 2 O 2的砜

摘要

描述了具有饭团构型的Ag @ CeO ₂作为非均相和高效催化剂，用于在芳族和脂族硫化物选择性氧化为它们相应的砜时活化H ₂ O ₂。CeO ₂ -Ag界面中的Ag纳米颗粒增加了CeO ₂表面的氧空位缺陷，并且氧空位缺陷促进Ce ⁴⁺还原为Ce ³⁺以保持电子中性。生成的Ce ³⁺物种充当CeO ₂界面中的活性位点-Ag促进硫化物氧化成砜。Ag @ CeO ₂ / H ₂ O ₂催化剂体系与多种芳族和脂族硫化物的相容性，优异的选择性，高收率的产品，简单的实验程序以及温和的反应条件是其一些宝贵的优势。

图形摘要