摘要
采用水热晶化法合成了含骨架杂原子的TiY分子筛,通过X射线粉末衍射(XRD)、傅里叶变换红外光谱(FT-IR)、差示扫描量热、吡啶吸附红外光谱等方法考察了杂原子Ti进入Y分子筛骨架后对分子筛各项性能的影响。结果表明,TiY分子筛具有典型的Y型分子筛晶体结构;随着Ti添加量的增加,TiY分子筛晶化所需的时间延长,晶胞常数增大,分子筛的热稳定性和水热稳定性均有所增强。与Y分子筛相比,TiY分子筛的L酸中心数量明显增加,同时B酸中心强度增加,TiY分子筛的裂化反应活性提高,催化剂上的积炭量明显减少。
The hetero-atomic zeolite TiY was synthesized hydrothermally. The crystal structure, thermal stability, surface acidity and catalytic properties of TiY were characterized by X-ray diffraction （ XRD）, infrared spectroscopy （IR）, pyridine-IR and micro-reaction activity test （MAT）. The results showed that titanium had not influence on the crystal form of Y, but the time of crystallization prolonged and the unit cell of zeolite TiY increased. TiY has higher thermal and hydrothermal stability than USY. Both the amount of Lewis acid sites and the strength of Bronsted acid sites of TiY increased. Comparing with USY, the activity of TiY for cracking reaction enhanced whereas the coke on the catalyst reduced distinctly.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2006年第5期616-619,共4页
Journal of Fuel Chemistry and Technology
基金
国家重点基础研究发展规划(973计划
2004CB217806)
关键词
杂原子
TiY分子筛
骨架稳定性
表面酸性
裂化活性
hetero-atom
zeolite TiY
hydrothermal stability
surface acidity
cracking activity
