摘要
利用N2 吸附 ,TG DTA ,FT IR ,UV Vis和UV Raman光谱等技术对以硅溶胶和TiCl3水溶液为原料合成的中孔Ti MCM 4 1分子筛的孔结构和钛的配位状态进行了详细的表征 .N2 吸附等温线表明 ,Ti MCM 4 1分子筛的孔径比纯硅MCM 4 1分子筛小 ,钛的加入使分子筛的单胞体积大大增加 ,比表面积和孔壁厚度也显著增大 .TG DTA结果表明 ,Ti MCM 4 1分子筛中存在着两种不同的模板剂键合位 .FT IR ,UV Vis及UV Raman光谱表明 ,Ti原子存在于分子筛骨架中且以四面体方式配位 ,没有结晶状态的TiO2 形成 .
The Ti-MCM-41 molecular sieve synthesized with colloidal silica and titanium trichloride has been characterized by nitrogen adsorption, TG-DTA and spectroscopies of FT-IR, UV-Vis and UV-Raman. N-2 adsorption isotherms reveal that with the incorporation of titanium into the framework of the molecular sieve, the pore size decreases and the wall thickness increases. TG and DTA profiles suggest that different template sorption sites exist in the framework of Ti-MCM-41. FT-IR, UV-Vis and UV-Raman spectra indicate that the formation of anatase TiO2 can be avoided during the preparation of the synthesis gel and the crystallization of the molecular sieve. Most Ti4(+) ions are isolated and tetrahedrally coordinated in the framework of MCM-41.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2001年第4期331-334,共4页
