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.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
1995年第4期127-132,共6页
Journal of Lanzhou University(Natural Sciences)
关键词
晶胞常数
热稳定性
超稳八面沸石
催化剂
沸石
unit cells constants
lattice stability
thermal stability
ultrastable faujasite zeolites
stretch frequency of framework
