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无机材料学报

无机材料学报

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TiO2在MCM-41内表面单层及双层分散的结构表征

郑珊; 高濂; 郭景坤   

  1. 中国科学院上海硅酸盐研究所高性能结构陶瓷与超微结构国家重点实验室, 上海 200050
  • 收稿日期:2000-01-04 修回日期:2000-01-17 出版日期:2001-01-20 网络出版日期:2001-01-20

Preperation and Characterization of Monolayered or Two-layered Titania Modified Mesoporous Molecular Sieves MCM-41

ZHENG Shan; GAO Lian; GUO Jing-Kun   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2000-01-04 Revised:2000-01-17 Published:2001-01-20 Online:2001-01-20

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摘要： 首次以有机物钛酸丁酯为前驱体，合成了ＴｉＯ２呈单层分散状态（Ｔｉ／Ｓｉ＝０.２０）或双层分散状态（Ｔｉ／Ｓｉ＝０．３９）的介孔分子筛ＭＣＭ－４１（Ｓｉ／Ａｌ＝３５），并以 ＸＲＤ，ＦＴＩＲ，Ｎ２吸附－脱附，固体ＵＶ－ｖｉｓ 漫反射等表征手段对其结构特征和氧化钛分散状态进行了研究．结果表明： ＴｉＯ２在介孔分子筛ＭＣＭ－４１孔道中分散， ＭＣＭ－４１骨架结构结晶度降低，但是附着二层ＴｉＯ２后，仍能保持长程有序结构； ＴｉＯ２与ＭＣＭ－４１孔道表面的ＳｉＯ２以化学键连接，生成Ｓｉ－Ｏ—Ｔｉ键；无论是单层还是双层分散的 ＴｉＯ２在 ＭＣＭ－４１内孔壁均匀分散；且由于ＴｉＯ２粒子的减小使其对紫外光的吸收发生明显的蓝移现象．

关键词: 介孔分子筛, MCM-41, 分散, TiO2

Abstract: Two kinds of titania modified the inner surface of mesoporous slilcate MCM-41 (MCM-TiO2 and MCM-Ti-TiO2) were synthesized by precursor
tetrabutyltitanate and calcined MCM-41. The samples were characterized by XRD, FTIR, nitrogen adsorption/desorption at 77K and solid state diffuse
reflectance UV-vis spectroscopy. XRD suggested that a long-range a long-range order kept in the hexagonal phase of titania modified MCM-41. Tetrabutyltitanate
cocondensation with the pendant OH groups of MCM-41 via Si--O--Ti bonds and titania modified the inner walls of MCM-41. Titania on the inner walls of
modified MCM-41 was estimated monolayer or two-layer according to the results of nitrogen adsorption/desorption isotherms. In UV-vis spectra,
titania modified MCM-41 had significant blue shift compared to bulk TiO2 which is attributed to the well known quantum size effect for semiconductor as the
particle size decreases.

Key words: mesoporous molecular sieve, MCM-41, TiO2, titania-modified MCM-41

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