Should ammonium chloride be added when performing a wet ion exchange of metals into zeolites and why?

Ladislao Sandoval-Rangel @Ladislao-Sandoval-Rangel

01 November 2013 1 4K Report

I'm reading an article where NH4Cl is added with metallic salts to zeolites to perform ion exchange, but they won't explain why.

Mehri Sanati

A proper device to store a batch of zeolite for ion-exchange investigations is to store the washed material in a chamber or vessel over a saturated aqueous solution of NH4Cl. This method provides the zeolite with a constant water content because the water activity of a saturated NH4Cl solution does not vary significantly with little changes in temperature

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