The catalytic oxidation of sulfides selectively to sulfoxides and/or sulfones is realised for the first time with heterogeneous tungstate-exchanged Mg-Al-LDH catalyst using 30% hydrogen peroxide in aqueous media at a faster rate in quantitative yields at room temperature. The heterogeneous catalyst showed higher activity (TOF) over its homogeneous analogues and other heterogeneous catalysts reported so far. The catalyst is well characterised by various instrumental techniques such as FT-IR spectroscopy, thermal analysis (TGA and DTA), powder XRD and chemical analysis. The catalyst is reused for six cycles with consistent activity and selectivity.
首次实现了在室温下使用异相
钨酸盐交换的Mg-Al-LDH催化剂,在30%
过氧化氢水溶液中快速定量地将
硫化物选择性催化氧化为亚砜和/或砜。该异相催化剂的活性(TOF值)高于其均相同类催化剂及其他已报道的异相催化剂。通过FT-IR光谱、热分析(TGA和DTA)、粉末XRD及
化学分析等多种仪器技术对催化剂进行了充分表征。该催化剂可循环使用六次,活性与选择性始终保持一致。