改性NaY分子筛研究NaY分子筛制备及其表征毕业论文.doc

海南大学
毕业论文(设计)
题目: 改性NaY分子筛研究

摘要
Y型分子筛是裂化催化剂的优良前驱体,其经改性后制备的催化剂广泛应用于催化裂化领域。因此,其改性技术一直是此领域的研究重点之一。本文利用原位晶化法制备了NaY分子筛微球;采用离子交换等方法对所制备微球进行改性,得到了改性Y型分子筛,分析了其化学组成及离子交换度,并考察了其使用性能。
利用原位晶化法制备了NaY分子筛微球,并通过分析其晶化反应硅钠比, %。利用氢离子、铵根离子、稀土离子、磷离子等对上述微球进行离子改性,得到了改性Y型分子筛(HD-C催化剂)。利用常规化学分析方法,对其离子交换后母液中硅、铝、稀土等离子含量进行了分析,得到了催化剂组成及离子交换度,催化剂钠、稀土、铝、%、%、%、%;%。
利用程序升温脱附法(TPD)考察HD-C及对比剂的酸特性,并对其选择性、活性、抗金属污染等使用性能进行了评价,HD-;老化4h时HD-,,;800℃,100%水蒸汽老化4小时,镍:钒(4:1) 4000ppm污染量时,HD-,;800℃,100%水蒸汽老化4小时
时,HD-,。结果表明,所制备的改性Y型分子筛能完全满足商用要求。
关键词:Y型分子筛;晶化;离子交换;改性
Abstract
Y-type zeolite is synthetic zeolite,it plays an important role in catalytic cracking process. So the modification has been a focus of research in this area . This article was prepared NaY zeolite microspheres in situ crystallization ; the prepared NaY zeolite microspheres were modified by ion exchange method . Their position and degree of ion exchange were analyzed , and the use of performance was investigated.
NaY zeolite microspheres were prepared with situ crystallization method , through the analysis of crystalline reaction of silica than sodium obtained its crystallinity was %.Using of hydrogen ions, ammonium ions, rare earth ions and phosphate ions and other ions modified microspheres ,got modified zeolite Y(HD-C catalyst) . Using conventional chemical analysis analyzed silicon, aluminum and rare earth ion content of mother liquor after ion-exchange , got the position and degree of ion exchange. The sodium, rare earth, aluminum and iron contents of the catalyst were %, %, %, % respectively , and the total exchange degree reached % Na2O .
Using TPD studied HD-C`s and contrast agent`s acid properties , and its selectivity, activity, anti-metal pollution were evaluated . HD-C`s total acidity reached , activity was , selectivity was . The results showed that the modified Y ze