由煤系高岭土原位合成NaY分子筛

以煤系高岭土为原料 ,经碱熔活化、补硅 ,在优化的合成条件下 ,可以原位水热合成NaY分子筛。详细考察了晶化温度、晶化时间、加水量、老化时间和合成体系中硅铝比等反应因子对合成产物的结构和热稳定性的影响。得出的最佳反应条件如下 :合成体系中硅铝经为 2 ,晶化温度 370K、晶化时间 10h、老化时间 12h、加水量 4 0～ 6 0mL。其中 ,晶化温度和加水量是影响结晶产物物理结构性能的主要因素。采用XRD、IR、N2 静态容量吸附法、DTA DTG等手段对结晶产物的晶态结构、比表面积及孔分布、热稳定性等进行了表征。结果表明 ,以高岭土为原料可以原位合成出结晶度较高、无杂晶的NaY分子筛。所得分子筛比表面积较高 (42 0m2 /g) ,孔径分布集中 (集中在 0 .6nm) ,热稳定性好。

In-situ synthesis of NaY zeolite with coal based clay

NaY zeolites were in situ synthesized with the coal based clay as the raw material using the activating treatment and hydroxide sodium fusion and subsequent in situ crystallization hydrothermal synthesis methods. The effects of treatment conditions on this synthesis processing, such as silicon to aluminum ratio, crystallization time, crystallization temperature, aging time, amount of adding water, were extensively investigated. The crystal phase, the specific area and pore distribution, skeletal vibration, thermal stability of the synthesized NaY zeolites were deeply characterized with XRD, N\-2 adsorption, IR and DTG DTA methods. The reaction conditions were optimized. The results show that the crystallization temperature and the adding amount of water are the main factors affecting the property of synthesized NaY zeolite. The synthesized NaY zeolites are of a higher relative crystallinity, the excluding impure crystals and better hydrothermal stability. The specific area of the zeolite is larger, and the diameter distribution of micropore is concentrated in 0.6 nm. It can be concluded that in situ synthesis of NaY zeolite with coal based clay is feasible. The in situ synthesis method may provide a commercial route for the utilization of coal based clay.