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Super-ions of sodium cations with hydrated hydroxide anions: inorganic structure-directing agents in zeolite synthesis†
Karel
Asselman, 
‡a
Nick
Pellens,
‡a
Sambhu
Radhakrishnan,
ab
C. Vinod
Chandran,
ab
Johan A.
Martens,
ab
Francis
Taulelle,
ab
Toon
Verstraelen,
c
Matti
Hellström,
d
Eric
Breynaert
*ab
and
‡a
Nick
Pellens,
‡a
Sambhu
Radhakrishnan,
ab
C. Vinod
Chandran,
ab
Johan A.
Martens,
ab
Francis
Taulelle,
ab
Toon
Verstraelen,
c
Matti
Hellström,
d
Eric
Breynaert
*ab
and
Abstract
In inorganic zeolite formation, a direct correspondence between liquid state species in the synthesis and the supramolecular decoration of the pores in the as-made final zeolite has never been reported. In this paper, a direct link between the sodium speciation in the synthesis mixture and the pore structure and content of the final zeolite is demonstrated in the example of hydroxysodalite. Super-ions with 4 sodium cations bound by mono- and bihydrated hydroxide are identified as structure-directing agents for the formation of this zeolite. This documentation of inorganic solution species acting as a templating agent in zeolite formation opens new horizons for zeolite synthesis by design.
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