用DPA和/或DIPA模板剂合成SAPO-11分子筛

SYNTHESIS OF SAPO-11 MOLECULAR SIEVE WITH DPA AND/OR DIPA AS TEMPLATES

分别采用二正丙胺 (DPA)、二异丙胺 (DIPA)或其混合物为模板剂 ,在Al2 O3 P2 O5 SiO2 R (有机胺 ) H2 O体系中合成SAPO 11分子筛。结果表明 ,双胺法 (两种胺的混合物为模板剂 )合成能有效地避免单胺法 (单一模板剂 )合成中易出现SAPO 5、SAPO 31杂晶的问题。晶化产物的相对结晶度随模板剂组成的变化呈波形变化 ,当w (DPA)分别为 40 %、 6 0 %时 ,合成产物的相对结晶度出现极大值 ;当w(DPA)分别为 33%、 45 %时 ,相对结晶度出现极小值。这种结晶度的变化受晶化温度的影响不显著 ,但随凝胶中n(SiO2 ) /n(Al2 O3 )的变化而有所不同。

SAPO-11 was synthesized in the system of Al2O3-P2O5-SiO2-R Amine as template)-H2O with di-n-propylamine (DPA) or di-i-propylamine (DIPA) (Single template method) or their mixtures as templates (Dual-template method). The results showed that synthesis with dual-template can avoid the impure phases of SAPO-5 and SAPO-31 found in synthesis with single template method. The crystallinity of SAPO-11 is varied in a wave form with the variation of template composition by using dual-template method. When w(DPA)=40% or 60%, maximum values of product relative crystallinity appeared. When w(DPA)=33% or 45%, minimum values were obtained. The tendency of relative crystallinity was not significantly affected by crystallization temperature, but varied with the gel n(SiO2)/n(Al2O3) ratio.