中文摘要：

以二丙胺异构体（二正丙胺DPA和二异丙胺D-iPA）为结构导向剂，在200℃加热2组反应原料物质的量之比不同的初始凝胶．合成出了高结晶度的磷酸铝分子筛A1PO4-11。利用X射线粉末衍射分析、元素分析等表征手段，研究了凝胶的晶化过程和液相的pH值以及A1和P的浓度演化。初始凝胶各组分物质的量之比为nAl2O5：nP2O5：nDPA/D：nH2O=1.0：1.0：1.2：75时，以为DPA结构导向剂．晶化过程中无中间相生成，而以D-iPA为结构导向剂时，晶化过程中生成了具有12元环孔道结构的磷酸铝分子筛A1PO4-5中间相；初始凝胶各组分物质的量之比为nAl2O5：nP2O5：nDPA/D：nH2O=1.0：1.0：1.2：75时，以为结构导向剂，晶化过程中DPA生成了具有18元环孔道结构的磷酸铝分子筛VPI-5中间相，而以D-iPA为结构导向剂时，晶化过程中同时出现了VPI-5及A1PO4-5两种中间相。表明对于同一种有机胺，凝胶物质的量之比的改变影响了其结构导向效应。理论计算结果显示质子化的DPA及D-iPA中N原子上的电荷有差异．表明有机胺的结构微调影响其结构导向效应，但该影响依赖于凝胶组成。

英文摘要：

The structure-directing effect of dipropylamine isomers, i.e., di-n-propylamine （DPA） and diisopro- pylamine （D-iPA）, was investigated. By heating the initial gels with certain composition at 200 ℃ for 24 h, highly crystalline aluminophosphate molecular sieve A1PO4-11 was obtained. The crystallization processes were investigated using X-ray diffraction, elemental analysis and pH value measurement. For the crystallization process of the initial gel with nA12O3：np205/nDPA/D.iPA ：nH2O=l.0：l.0：1.2：75, no intermediate phase was formed when the DPA was used as the structure-directing agent, whereas intermediate phase of aluminophosphate molecular sieve A1PO4-5 was observed when the D-iPA was used as the structure-directing agent. For the crystallization process of the initial gel with nAl2O3 ：nP2O5：nDPA/D-iPA ：nH2O =1.0：1.0：1.0：75, intermediate phase of aluminophosphate molecular sieve VPI-5 was formed when the DPA was used as the structure-directing agent, whereas intermediate phases of both VPI-5 and A1PO4-5 were observed when the D-iPA was used as the structure-directing agent. Theoretical calculation showed that the charge on the N of the protonated DPA was different with that on the N of the protonated D-iPA. The results indicate that the structure-directing effect of amine can be affected by the composition of the initial gel and the fine-tuning of the structure of amine can influence its structure-directing effect. However, such influence is affected by the composition of the initial gel.