高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (S1): 200.

• 研究论文 • 上一篇    下一篇

高钛含量钛硅中孔材料的合成及理化性质研究

唐祥海, 温新, 孙世伟, 蒋海燕, 陈铁红   

  1. 南开大学化学学院, 天津 300071
  • 收稿日期:2001-08-07 出版日期:2001-12-31 发布日期:2001-12-31
  • 通讯作者: 唐祥海(1968年出生),男,博士,副教授,从事物理化学研究.e-mail:xhtans@public.cpt.tj.cn E-mail:xhtans@public.cpt.tj.cn
  • 基金资助:

    国家自然科学基金重点基金(批准号:29733070)及天津市自然科学基金(批准号:013608111)资助.

Studies on the Synthesis and Physicochemical Property of Mesoporous Titanosilicate with High Titanium Content

TANG Xiang-Hai, WEN Xin, SUN Shi-Wei, JIANG Hai-Yan, CHEN Tie-Hong   

  1. College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2001-08-07 Online:2001-12-31 Published:2001-12-31
  • Contact: xhtans@public.cpt.tj.cn E-mail:xhtans@public.cpt.tj.cn

摘要:

通过单独水解混合成胶在静态条件下采用水热晶化及水热后处理,在模版剂用量较低和n(Ti)/n(Si)高达1/4的条件下合成了钛硅中孔材料.XRD、FT-IR、UV-Vis DRS和催化选择氧化反应表征结果表明,新合成方法有效防止了成胶过程在高钛含量下产生不溶性钛硅物种,合成产物呈高度有序的MCM-41六方结构,并具有较高的热稳定性和催化选择氧化反应活性.四丁基氢氧化铵在成胶过程不仅有利于钛形成稳定的可溶性物种从而提高其利用率,同时还促进孔墙内基本结构单元的交联和有序化.

关键词: 钛硅中孔材料, 水热晶化, 水热后处理, MCM-41结构, 表征

Abstract:

With a gel of relatively low template content and high n(Ti)/n(Si) ratio up to 1/4, mesoporous titanosilicate has been synthesized under static conditions by hydrothermal crystallization and post-treatment. The novel approach includes a separate hydrolysis procedure before mixing the titanium and silicon resources during gel preparation. By means of XRD, FT-IR, UV-Vis DRS and selective catalytic oxidation, it reveals that the new approach effectively prevents titanium ions from formation of indissoluble titaniosilicate species in the synthesis gel at high titanium content. The obtained material possesses a highly ordered, hexagonal MCM-41 structure and is thermally stable and catalytically reactive in selective catalytic oxidation. The addition of tetrabutylammonium hydroxide during gel preparation not only helps the formation of stable soluble titanium species hence to improve the efficiency of titanium, but also results in the framework of the material more cross-linked and ordered.

Key words: Mesoporous titanosilicate, Hydrothermal crystallization, Hydrothermal post-tneatmenl, MCM-41 structure, Characterization

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