利用Taguchi法以高岭土为原料制备高硅NaY分子筛

采用Taguchi试验方法优化出了以高岭土为原料制备高硅NaY分子筛的最佳合成参数，考察了硅溶胶的加入量、反应体系的碱度、加水量以及晶化时间对NaY分子筛硅铝比和结晶度的影响。结果表明，高硅NaY分子筛的最佳合成条件是：反应体系各组分的物质的量比为7.5SiO₂∶1.0Al₂O₃∶2.2Na₂O∶120H₂O，晶化时间为16 h。同时发现，对合成样品性能的影响最为显著的因素是硅溶胶的加入量和碱度。采用X射线衍射、N₂静态容量吸附法和扫描电镜对利用最佳条件所合成样品的硅铝比、比表面积、孔分布以及表观形貌进行了表征。结果显示，以高岭土原料制备的NaY分子筛比参考样品拥有更高的硅铝比和更大的比表面积。

Synthesis of High-Silica NaY Zeolite from Kaolin Based on Taguchi Technology

This paper repots a study of using Taguchi technology to find the optimum parameters for the synthesis of high-silica Y-zeolite from kaolinite.The effects of additional silica source,alkali,distilled water,and crystallization time on the synthesis of high Si/Al zeolite Y were investigated.The results show that the dosage of additional silica source (silica sol) and alkali are the most influential factors on the synthesis of high-silica Y zeolite.The optimum preparation conditions are that the molar composition of sodium aluminosilicate gel is 7.5SiO2:1.0Ai2O3:2.2Na2O:120H2O,and crystallization time is 16 h.The NaY zeolite synthesized at optimized conditions was characterized by X-ray diffraction(XRD),N2 adsorption-desorption techniques and Scanning electron microscope(SEM).The characterization results indicate that the sample has higher Si/Al ratio and larger Surface area than the referenee Y zeolite sample.