富硅超稳八面沸石研究──组成与结构参数及稳定性的关系  

Studies of Ultrastable Faujasites Enriched in Silicon -The Relation between Composition Structure Parameters and Stability

作　　者：朱超[1] 乔晨生[1] 王秋莹[1] 吕绥生 

机构地区：[1]兰州大学化学系,甘肃省中医学院

出　　处：《兰州大学学报（自然科学版）》1995年第4期127-132,共6页Journal of Lanzhou University(Natural Sciences)

摘　　要：用（ＮＨ４）２ＳｉＦ６二次合成法制备了ｓｉ／Ａｌ比不同的ＦＳＹ样品，再经５００℃水热处理制得相应的ＵＳ－ＳＹ系列样品，用ＸＲＤ技术测定诸样品的晶胞参数α０和相对结晶度；用ＤＴＡ分别测定脱水峰温和晶格崩塌峰温；以ＩＲ法测定其骨架振动谱带。结果表明总Ｓｉ／Ａｌ＝３．９～７．１的ＦＳＹ系列样品及相应的ＵＳ－ＳＹ系列样品随Ｓｉ／Ａｌ增大，晶胞参数依次缩小，与ＮＨ４Ｙ及ＵＳＹ相比有较高的结晶度和热稳定性及骨架稳定性。系列ＵＳ－ＳＹ样品以ＵＳ－ＳＹ（５．７）具有最佳结构参数。Faujasite zeolites with different Si/Al ratios (FSY=3. 9￣7. 1) were prepared by secondary synthesis with (NH4)2SiF6. Corresponding US-SY (4.2￣ 7.1) samples are obtained by FSY (4.2￣ 7.1) series samples after 500℃ hydrothermal treatment. Comparision with NH4Y and USY; these zeolites have higher crystallinity and thermal stability; the relations among crystal collapse temperature, unit cells constants, IR asymmetric stretch frequency and Al/(Al+Si ) ratios of these zeolites have been described. The US-SY (5.7) zeolite possesses excellent structure parameters and stability.

关 键 词：晶胞常数 热稳定性 超稳八面沸石 催化剂 沸石 

分 类 号：O643.36[理学—物理化学]