Organophosphates are highly toxic compounds used as pesticides and chemical warfare agents. Herein, we describe SiO₂-supported Fe, Co, and Cu catalysts that degrade organophosphate pesticide malathion at mild temperatures in the presence of H₂O₂. These catalysts are prepared by impregnation of SiO₂ with solutions of bulky metal chelates that promote dispersion and low coordination, as shown spectroscopically. Turnover frequencies of catalysts prepared from chelated precursors are higher than those of controls prepared from nitrates and oxides, and independent of metal loading. The latter indicates equal activity and accessibility of active sites and suggests invariant structure in the loading range studied.

有机磷酸盐是用作农药和化学战剂的剧毒化合物。在这里，我们描述了SiO ₂负载的Fe，Co和Cu催化剂，该催化剂在H ₂ O ₂存在的情况下，在温和的温度下降解有机磷酸盐农药马拉硫磷。这些催化剂通过用大体积金属螯合物溶液浸渍SiO ₂来制备，该溶液可促进分散和低配位，如分光镜所示。由螯合的前体制备的催化剂的周转频率高于由硝酸盐和氧化物制备的对照的周转频率，并且与金属负载量无关。后者表明活性位点的活性和可及性相等，并表明在所研究的负载范围内结构不变。