多维NaY分子筛的水热稳定性研究

引入功能梯度化设计概念，合成了表面多维化的NaY分子筛，采用X射线衍射仪、X射线荧光光谱仪、比表面积、微反活性和小型流化床催化剂评价装置(ACE)等表征分子筛及其催化剂老化前后的性能。结果表明，由多维NaY分子筛制备的稀土Y型分子筛REY-D, 其水热稳定性低于常规NaY分子筛所制得的REY-C分子筛。当分子筛与基质结合后，结果相反，多维NaY分子筛催化剂的老化活性高于常规NaY分子筛所制得的催化剂，且随着老化时间的延长，效果更明显。ACE选择性测试结果表明，采用多维NaY分子筛所制得的催化剂汽油收率高，而重油和柴油收率低，且汽油产品中烯烃含量低，液化气中的低碳烯烃含量高。

Study on hydrothermal stability of DNY zeolites

A NaY zeolite with multi-dimensional surface （DNY） was synthesized using function-gradient design concept and properties of the zeolite and the zeolite-based catalysts were characterized by XRD, XRF, BET, MAT and ACE. The results showed that hydrothermal stability of the rare-earth Y zeolite REY-D prepared from the as-synthesized NaY zeolite was inferior to that of REY-C zeolite prepared from conventional NaY zeolite, while reversed results were observed after combining the REY zeolite with matrix, and these tendency became more and more remarkable with aging time. ACE test results showed that catalysts prepared from the as-synthesized NaY zeolite exhibited higher selectivity to gasoline and lower selectivity to heavier and diesel oil, with low content of olefins in gasoline and higher content of olefins in LPG.