Aqueous solution azide, properties

In aqueous solution, HN3 is a weak acid its salts are called azides. Azides contain the azide ion, N3, and resemble chlorides in some properties (for instance, AgNs is insoluble in water), but they are unstable. Some azides (such as lead azide) are used to make detonators. The release of N2(g) by the decomposition of sodium azide, NaN3, is the basis of the air-bag safety system in automobiles (page 212). 

In order to take benefit of the strong geometrical constraints of the zeolite voids, so as to improve the basic properties, basic moities insertion inside the pores was achieved by several authors [2-4,9,12,13]. The direct incorporation of alkali hydroxide during their synthesis by treatment of aqueous or methanolic solution [13] can lead to loss of crystallinity by Al-0 solvolysis. This phenomena can be avoided by using a mild method consisting of a thermal decomposition of neutral alkali salts previously occluded inside the zeolite void cavities [9]. In this respect. Martens et al. prepared supported sodium clusters on zeolites generated by impregnation of sodium azide followed by its thermal decomposition [2-4]. 

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