Synthesis of zeolite SSZ-24 using a catalytic amount of SSZ-13 seeds

Lingxue Tang , Kok-Giap Haw , Ping He , Qianrong Fang (1) , Shilun Qiu (1) , Valentin Valtchev (2)

1 JLU - Jilin University
2 LCS - Laboratoire catalyse et spectrochimie

Highly crystalline and pure SSZ-13 zeolite is obtained by interzeolite conversion of zeolite Beta and zeolite L. Zeolite Beta is used without preliminary treatment, while zeolite L is subjected to dealumination in order to reach the Si/Al ratio appropriate for the synthesis of SSZ-13. The formation of SSZ-13 from conventional chemicals is also studied. The crystallization from zeolite precursors is much faster and provides pure and highly crystalline SSZ-13. The improved crystal growth kinetics is attributed to the directing effect of the dissolved Si-O-Al fragments from zeolite Beta and zeolite L frameworks. CHA-type zeolites obtained from dealuminated zeolite L crystallized faster, showed higher crystallinity and more defined crystals morphology in respect to those obtained from zeolite Beta. The dealuminated zeolite L was found to be an outstanding starting material for the crystallization of SSZ-13.

Mots clés: Zeolite synthesis; Interzeolite conversion; SSZ-13; Crystal growth kinetics; Zeolite synthesis

Domaines: Chimie

Lingxue Tang, Kok-Giap Haw, Ping He, Qianrong Fang, Shilun Qiu, et al.. Synthesis of zeolite SSZ-24 using a catalytic amount of SSZ-13 seeds. Inorganic Chemistry Frontiers, 2019, 6 (11), pp.3097-3103. ⟨10.1039/C9QI00971J⟩. ⟨hal-02397881⟩