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Synthesis and characterization of mesoporous sodalite and investigation of the effects of inorganic salts on its structure and properties

Microporous and Mesoporous Materials(2020)

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Abstract
Mesoporous sodalite was prepared using a bridged polysilsesquioxane monomer as the mesoporogen in the presence of chloride-containing salts (NaCl, KCl, and NH4Cl), and characterized using different analytical techniques. As the amount of organosiloxane increased in the synthetic mixture, the total BET surface areas of samples initially increased and then decreased. When 6 ml mesoporogen was added, the prepared sodalite sample showed the largest external BET surface area of 179 m2/g. Meanwhile, the addition of salts promoted crystallization, and the sodalite surface area reached 295 m2/g, making its skeletal framework more regular and weakening the template effect. Furthermore, mesoporous sodalite samples were used to evaluate the alkali catalytic performance of 1,3-dichloropropanol during the preparation of epichlorohydrin. The results showed that a larger surface area and pore volume were beneficial to the conversion and selectivity of this reaction.
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Key words
Sodalite,Mesoporous,Soft template,Inorganic salt,Alkali catalytic
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