低稀土超稳Y分子筛的改性研究及表征-化学工艺专业论文.docxVIP

低稀 低稀土超稳 Y 分子筛的改性研究及表征 兰州 兰州交通大学硕士学位论文 万方数据 万方数据 万方数据 万方数据 酸强度，从而影响酸性分布，对酸性和活性要求不高的反应具有一定的调节作用；研究 还发现，不同的浸渍处理方式会对 Y 型分子筛的物化性能产生不同影响。这些结论为进 一步的相关实验研究提供了理论基础，为开发新型分子筛催化剂的制备技术积累了一些 实验数据与材料，并为 FCC 催化剂的工业化生产应用提供了一定的参考与借鉴。 关键词：超稳 Y 分子筛；稳定性；催化裂化；改性 论文类型：应用研究 II Abstract Fluid catalytic cracking (FCC) is the major heavy-oil refining operation, and also is the crucial technology to oil refining enterprises. Y zeolite has been used as active ingredient in cracking catalyst for FCC process almost all the time when it was found, due to it‘s special structure of ?twelve-membered ring‘ in Y zeolite as Three-dimensional Open Framework, it‘s markedly physicochemical properties and the lower cost. The cracking activity and selectivity of zeolite largely decide the products distribution; Therefore, the structure stability, cracking activity and selectivity of Y zeolite are so important to petrochemical companies about manufacture and economic interests. Currently, zeolite catalysts with higher rare earth (RE) content and bigger unit cell have succeeded in industrialized application, nevertheless, the ratio of residual oil in FCC raw materials has become much more gradually. In order to adapt to complex reaction environment better, the zeolite catalysts with higher performance badly in need. For exploiting a new style of Y zeolite catalyst, which possess higher silica-alumina ratio, smaller unit cell, better stability and selectivity. In this study, the ultra stable Y (USY) zeolites which with different rare earth content and different sodium (Na) content are prepared by impregnation method. For the aim that synthetic effects of RE and Na on physicochemical Parameters of USY Zeolite with different content were investigated thoroughly, These samples were characterized using X-ray diffraction (XRD), The NH3-temperature programmed desorption technique (NH3-TPD), infrared spectra of pyridine adsorbed (IR), X-ray fluorescence (XRF), micro-activity reactor (MAT) and N2-adsorption technique.