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A method for producing chlorine dioxide by activating a mixture of impregnated zeolite crystals, the mixture itself, and a method for regenerating the mixture after chlorine dioxide production. The activation is accomplished by causing water or a moisture-containing gas (e.g., air including water va

A method for producing chlorine dioxide by activating a mixture of impregnated zeolite crystals, the mixture itself, and a method for regenerating the mixture after chlorine dioxide production. The activation is accomplished by causing water or a moisture-containing gas (e.g., air including water vapor) to flow through the mixture or otherwise exposing the mixture to such fluid, or by exposing the mixture to liquid hydrogen peroxide, liquid sulfuric acid, ferric chloride solution, or sodium chlorate solution. The mixture can include sodium chlorite-impregnated zeolite crystals and zeolite crystals impregnated with ferric chloride, ferric sulfate, or both, and optionally also zeolite crystals impregnated with calcium chloride. Alternatively, the mixture includes sodium chlorate-impregnated zeolite crystals, sulfuric acid-impregnated zeolite crystals, zeolite crystals impregnated with one or more of calcium chloride (or another deliquescent or water absorbing and retaining substance, such as one or more of ferric chloride and ferric sulfate), and an oxidizer (such as hydrogen peroxide, sodium metabisulfite, or sodium bisulfite). The oxidizer reacts (in the presence of water absorbed by the deliquescent or water absorbing substance) to release another substance which in turn reacts with one or more of the other impregnating substances to produce chlorine dioxide. The chlorine dioxide release rate can be controlled in any of several ways, including by selecting the concentration and amount of activating liquid, or using zeolite having a selected weight ratio of one or more impregnating substance to zeolite.

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[ What is claimed is:] [10.] A method for producing chlorine dioxide, including the steps of:(a) providing a zeolite crystal mixture, the zeolite crystal mixture comprising zeolite crystals impregnated with sodium chlorate, zeolite crystals impregnated with sulfuric acid, zeolite crystals impregnate

[ What is claimed is:] [10.] A method for producing chlorine dioxide, including the steps of:(a) providing a zeolite crystal mixture, the zeolite crystal mixture comprising zeolite crystals impregnated with sodium chlorate, zeolite crystals impregnated with sulfuric acid, zeolite crystals impregnated with at least one of a deliquescent and a water absorbing and retaining substance, and zeolite crystals impregnated with an oxidizer; and(b) causing the zeolite crystal to contact a moisture-containing fluid, thereby activates the zeolite crystal mixture to produce the chlorine dioxide.