Control the Size and Size Distribution of SAPO-34 Fine Particles by Variation of Agitation Method and the Type of Organic Templates

In the present study synthesis of nanostructured SAPO-34 fine particles was carried out by sol-gel hydrothermal method and the influence of two influential factors that are rarely considered in recent researches are considered and examined to achieve smaller, more uniform and higher phasepurity of SAPO-34 particles. It is concluded that external agitation against internal stirring of thegel mixture during hydrothermal process caused more thermal distribution of the gel mixture andimproved the size uniformity and phase purity of the synthesized SAPO-34 with finer size of the particles. Also Application of TEAOH as the single template produced finer and more unform particles than using mixed template of TEAOH and morpholine. Finally among the produced samples, the gel mixture with molar composition of Al2O3: 0.6 SiO2: 1 P2O5: 1.8 TEAOH: 0.4 morpholine: 75 H2O and external agitation method produced sufficiently fine SAPO-34 with narrow particle size distribution.

Keywords:

nanostructured material , SAPO-34 , zeotype molecular sieve , fine particles , sol-gel synthesis