Selective Crystallization of SAPO-5 and SAPO-34 Molecular Sieves in Alkaline Condition: Effect of Heating Method

Bulletin of the Korean chemical society

Ji Woong Yoon¹  Young Ho Kim¹  Jong-San Changa¹  Sang-Eon Park¹  Sung Hwa Jhung¹ 

关键词: SAPO-5;    SAPO-34;    Phase selectivity;    Microwave heating;    N;    N;    N¡¯;    N¡¯-Tetraethylethylenediamine;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Crystallization of SAPO-5 and SAPO-34 molecular sieves with microwave and conventional electric heating of the same gel has been investigated in an alkaline condition using N,N,N�?,N�?-tetraethylethylenediamine as a template molecule. SAPO-5 structure can be selectively prepared with microwave heating because of the fast crystallization of the technique. On the other hand, SAPO-34 is the sole product with usual conventional electric heating because SAPO-5 can be gradually transformed into SAPO-34 structure with an increase in crystallization time. This phase selectivity is probably because of the relative stability of the two phases at the reaction conditions (kinetic effect). Crystallization with microwave heating can be suggested as a phase selective synthesis method for relatively unstable materials because of fast crystallization.

【 授权许可】

Unknown