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A colorimetric study was made of the kinetics of the reduction of acidic titanium(IV) chloride solutions by hydrogen diffusing through a palladium membrane. The rate of this reaction was found to be first order with respect to the concentration of the titanium and was inhibited by the addition of organic poisons. The inhibition followed an adsorption isotherm leading to the conclusion that the rate of the reaction was controlled either by adsorption of titanium(IV) or by a reaction involving an adsorbed titanium(IV) species.

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