摘要
以二异丙胺为模板剂,利用微波辐射法合成了AlPO4-11和SAPO4-11分子筛,考察了合成压力、HF用量对合成AlPO4-11分子筛的影响;利用X射线衍射和扫描电子显微镜对所合成分子筛的结晶度及晶体形貌进行了表征。实验结果表明,利用微波技术合成的具有AEL晶体结构的AlPO4-11和SAPO4-11分子筛结晶度高、晶粒均匀(为长约5μm的棒状晶体)。通过考察晶化时间对合成产物的影响发现,微波合成的AlPO4-11分子筛是由六方晶系的正磷酸铝发生晶相转化而来的。利用X射线能谱对合成的SAPO4-11分子筛表面硅原子的含量进行了测定,并结合吡啶吸附傅里叶变换红外光谱表征结果证实,SAPO4-11分子筛具有B酸和L酸两种酸性位,但由于合成产物表面硅原子含量较少,因此酸性位也较少。
AIPO4-11 and SAPO4-11 molecular sieves were synthesized under microwave.radiation with diisopropylamine used as template. Influences of synthesis pressure, HF content and crystallization time on properties of end products were investigated. The molecular sieves obtained were characterized by means of XRD, SEM, EDS and Pyridine-FTIR to study their crystalline phase, purity and morphology. Both AIPO4-11 and SAPO4-11 molecular sieves are in form of AEL crystalline structure, high in crystallinity and rod-like crystals with length of rod about 5μm. The crystals of AIPO4-11 molecular sieves are transformed from hexagonal berlinite. The content of Si atoms on SAPO4-11 surface was determined. Both BrSnsted and Lewis acidic sites exist on SAPO4-11 molecular sieves. But acidic sites are not rich because of low content of Si atoms.
出处
《石油化工》
CAS
CSCD
北大核心
2007年第1期21-25,共5页
Petrochemical Technology
基金
陕西省科技攻关项目(2006k06-G9)
