高岭土微球内置导向剂法制备原位晶化催化裂化催化剂

PREPARATION OF IN-SITU CRYSTALLIZATION TYPE CATALYTICCRACKING CATALYST BY INTRODUCING Y ZEOLITE SEEDSOLUTION TO PREFORM KAOLIN MICROSPHERES

在高岭土微球预成形过程中引入Y沸石导向剂,再以原位晶化法制备了NaY高岭土复合微球,并采用X射线荧光光谱(XRF)、X射线衍射(XRD)、低温N_(2)吸附-脱附、扫描电子显微镜(SEM)进行了表征。XRF和XRD表征结果显示,与常规方法相比,引入导向剂后所制备的NaY高岭土复合微球的硅铝比从1.61上升到1.70,Y沸石结晶度从21%增加到29%。N_(2)吸附-脱附表征结果显示,常规方法制备的NaY高岭土复合微球的比表面积为311.8 m^(2)/g,孔体积为0.28 cm^(3)/g,而引入导向剂后复合微球的比表面积和孔体积分别增加到521.8 m^(2)/g和0.41 cm^(3)/g,同时介孔孔径从4~25 nm增加到10~150 nm。与常规方法制备的催化剂相比,在引入导向剂所制备原位晶化催化剂作用下,重油催化裂化的油浆收率下降3.78百分点,汽油收率增加3.48百分点,总液体收率增加3.11百分点。

NaY kaolin composite microspheres were prepared by in-situ crystallization of kaolin microspheres after introducing Y zeolite seed solution in the preforming process,and it was characterized by X-ray fluorescence spectroscopy(XRF),X-ray diffraction(XRD),N_(2) adsorption-desorption at low temperature and scanning electron microscopy(SEM).XRF and XRD showed that compared with conventional methods,the silicon aluminum ratio of NaY kaolin composite microspheres prepared by introducing seed solution increased from 1.61 to 1.70,and the crystallinity of Y zeolite increased from 21% to 29%.N_(2) adsorption-desorption characterization result showed that the specific surface area and pore volume of NaY kaolin composite microspheres prepared by conventional methods were 311.8 m^(2)/g and 0.28 cm^(3)/g,respectively.After the introduction of seed solution,the specific surface area and pore volume increased to 521.8 m^(2)/g and 0.41 cm^(3)/g,respectively,and the mesoporous distribution increased from 4-25 nm to 10-150 nm.The catalytic cracking test results of heavy oil showed that compared with conventional methods,the slurry yield over the in-situ crystallization catalyst prepared by introducing seed solution as additives decreased by 3.78 percentage points,the gasoline yield increased by 3.48 percentage points,and the total liquid yield increased by 3.11 percentage points.