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预处理方法对钛硅沸石催化性能的影响
引用本文:郭新闻,刘民,王祥生,李钢,陈永英,刘松.预处理方法对钛硅沸石催化性能的影响[J].催化学报,2001,22(4):370-372.
作者姓名:郭新闻  刘民  王祥生  李钢  陈永英  刘松
作者单位:大连理工大学
基金项目:国家自然科学基金,中国石油化工总公司资助项目,,29792071,,
摘    要: 采用不同的介质(HCl-H2O2,NH4F-H2O2,HNO3-H2O2,H2SO4-H2O2)对钛硅沸石TS-1进行预处理,并用IR,XRD,UV-Vis,XRF和27AlMASNMR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20%,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H2O2的有效利用率明显升高.特别是采用NH4F-H2O2预处理时,H2O2的转化率和有效利用率均提高10%.

关 键 词:钛硅沸石  预处理  盐酸  氟化铵  硝酸  硫酸  丙烯  环氧化
文章编号:0253-9837(2001)04-0370-03
收稿时间:2001-08-25

Effect of Pretreatment Methods on Catalytic Performance of Titanium Silicalite-1
GUO Xinwen ,LIU Min,WANG Xiangsheng,LI Gang,CHEN Yongying,LIU Song.Effect of Pretreatment Methods on Catalytic Performance of Titanium Silicalite-1[J].Chinese Journal of Catalysis,2001,22(4):370-372.
Authors:GUO Xinwen  LIU Min  WANG Xiangsheng  LI Gang  CHEN Yongying  LIU Song
Institution:GUO Xinwen *,LIU Min,WANG Xiangsheng,LI Gang,CHEN Yongying,LIU Song
Abstract:Titanium silicalite-1 (TS-1) was pretreated by solution of HCl-H 2O 2,NH 4F-H 2O 2,HNO 3-H 2O 2 or H 2SO 4-H 2O 2. The pretreated samples were characterized by IR, XRD, UV-Vis, XRF and 27 Al MAS NMR and evaluated by epoxidation of propylene with H 2O 2. The results showed that almost all Na + and about 20% of TiO 2 are removed from TS-1 after pretreatment. The TiO 2 removed from TS-1 is extra-framework titanium species. After pretreatment, the selectivity for PO decreases, and the utilization of H 2O 2 increases obviously. Concerning the utilization and the conversion of H 2O 2, the pretreatment method with NH 4F-H 2O 2 is the best one.
Keywords:titanium silicalite-1  pretreatment  hydrochloric acid  ammonium fluoride  nitric acid  sulphuric acid  propylene  epoxidation  
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