摘要
采用蒸汽相合成法,在F-作为矿化剂以及乙二胺作为液相的条件下,合成出低硅沸石DFT和GIS。重点考察了氢氟酸(HF)用量和硅铝比(n(Si O2)/n(Al2O3))对低硅沸石DFT和GIS合成的影响,其较佳固相凝胶组成分别为:n(HF)∶n(Si O2)∶n(Al2O3)∶n(H2O)=0.5∶1.0∶0.5∶5.0,n(HF)∶n(Si O2)∶n(Al2O3)∶n(H2O)=2.5∶1.0∶0.5∶5.0。元素分析和热重结果表明,双质子化的乙二胺起到平衡骨架负电荷的作用,结构导向合成出低硅沸石DFT和GIS。HF的用量对合成产物物相有明显影响,少量的HF有利于合成低硅沸石DFT,增加HF的用量则导致低硅沸石GIS的生成。
Synthesis of low -silica zeolite DFT and GIS were conducted with ethylene diamine as liquid phase and fluoride ion as mineralizing agent. Factors that affect the crystallization of low - silica zeolites, such as the dosage of hydrofluoric acid （HF） and mole ratio n （ SiO2 ）/n （ Al2 O3 ）, were examined. Results showed that suitable molar compositions of the solid phase gels for low - silica zeolites DFT and GIS are n （HF） ： n（SiO2）： r^（A1203）： n（U20） =0.5： 1.0：0.5： 5. 0 and n（HF）： n（SiO2） ： n（A1203 ）： n（H20） =2.5： 1. O： O. 5： 5.0, respectively. The results of elemental analyses as well as TG analyses confirmed that di - protonated ethylene diamine plays structure -directing and negative charge -compensating roles in the formation of zeolites DFT and GIS. The results also showed that the HF concentration displays a remarkable influence on the product type. Lower dosage of HF is preferable to form zeolite DFT, while increasing of the dosage of HF is preferable to form zeolite GIS.
出处
《日用化学工业》
CAS
CSCD
北大核心
2015年第6期332-336,共5页
China Surfactant Detergent & Cosmetics
基金
国家自然科学基金资助项目(21306126)
山西省基础研究计划资助项目(2013021008-1)
关键词
低硅沸石
合成
蒸汽相
low - silica zeolite
synthesis
vapor phase
