Four new types of materials that all catalyze the desired oxidative decontamination (selective sulfoxidation) of CEES, the best mustard (HD) simulant, using simply air as the oxidant under extremely mild conditions will be described. The high reactivity for this challenging yet attractive decontamination/protection chemistry derives in all cases from the incorporation of particular catalytically active polyoxometalates (POMs) into the materials. First, a gel comprised of esterified hexavanadate (V6) POM units ...