预处理方法对钛硅沸石催化性能的影响  

Effect of Pretreatment Methods on Catalytic Performance of Titanium Silicalite-1

作　　者：郭新闻[1] 刘民[1] 王祥生[1] 李钢[1] 陈永英[1] 刘松[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室,大连116012

出　　处：《催化学报》2001年第4期370-372,共3页

基　　金：国家自然科学基金;中国石化总公司联合资助项目 ( 2 9792 0 71)

摘　　要：采用不同的介质 (HCl H2 O2 ,NH4F H2 O2 ,HNO3 H2 O2 ,H2 SO4 H2 O2 )对钛硅沸石TS 1进行预处理 ,并用IR ,XRD ,UV Vis,XRF和 2 7AlMASNMR对样品进行了表征 ;以丙烯环氧化为探针反应 ,考察了样品的催化性能 .结果表明 ,经预处理后 ,TS 1中的TiO2 均被脱除约 2 0 % ,而Al几乎未被脱除 ;所脱除的TiO2 为非骨架钛 ;环氧丙烷的选择性降低 ,但H2 O2 的有效利用率明显升高 .特别是采用NH4F H2 O2 预处理时 ,H2 O2 的转化率和有效利用率均提高 10 % .Titanium silicalite-1 (TS-1) was pretreated by solution of HCl-H2O2, NH4F-H2O2, HNO3-H2O2 or H2SO4-H2O2. The pretreated samples were characterized by IR, XRD, UV-Vis, XRF and Al-27 MAS NMR and evaluated by epoxidation of propylene with H2O2. The results showed that almost all Na+ and about 20% of TiO2 are removed from TS-1 after pretreatment. The TiO2 removed from TS-1 is extra-framework titanium species. After pretreatment, the selectivity for PO decreases, and the utilization of H2O2 increases obviously. Concerning the utilization and the conversion of H2O2, the pretreatment method with NH4F-H2O2 is the best one.

关 键 词：钛硅沸石 预处理 盐酸 氟化铵 硝酸 硫酸 丙烯 环氧化 催化性能 环氧丙烷 TS-1 催化剂 

分 类 号：O643.3[理学—物理化学]