摘要
采用水热晶化法成功地合成了Ｔｉβ分子筛．运用ＸＲＤ，ＩＲ，ＵＶＶｉｓ和ＳＥＭ等多种现代物理技术表征了合成的Ｔｉβ分子筛样品的物化特性，证明了它具有ＢＥＡ拓扑结构，结晶良好，且钛原子进入了分子筛的骨架，无非骨架钛存在，晶粒大小约为０３μｍ．考察了合成路线、晶化时间等因素对Ｔｉβ分子筛的影响，发现不同合成路线只对结晶度有影响，晶化时间在１０～１２ｄ较好．探针反应结果表明，Ｔｉβ分子筛对苯乙烯氧化具有较好的催化性能．
Ti β molecular sieves through isomorphous replacement of Si by Ti in zeolite β have been successfully synthesized according to hydrothermal procedure. The samples are subjected to physicochemical characterization by XRD, IR, UV Vis and SEM. The results confirm that Ti β molecular sieves contain a BEA phase of good crystallinity, Ti is incorporated in the framework, there are no extraframework Ti species, Ti β crystals are round and their size is about 0 3 μm. The synthesis routes only have effect on crystallinity of Ti β molecular sieves. To obtain pure Ti β molecular sieves, the optimum crystallization time is between 10 and 12 d. Ti β molecular sieves exhibit good catalytic behavior in the selective oxidation of styrene with H 2O 2, which indirectly prove that the titanium atoms are indeed introduced in the framework.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1998年第6期574-578,共5页
关键词
分子筛
Ti-β分子筛
合成
催化性能
苯乙烯
氧化
Ti β molecular sieve, Synthesis, Characterization, Catalytic behavior, Styrene, Oxidation
