Incorporation of titanium into H-ZSM-5 zeolite via chemical vapor deposition: Effect of steam treatment

作者：Xu CH; Jin TH; Jhung SH; Hwang JS^*; Chang JS; Qiu FL; Park SE

来源：Bulletin of the Korean Chemical Society, 2004, 25(5): 681-686.

• TS-1
• TiCl4
• secondary synthesis
• water vapor
• styrene oxidation

Ti-ZSM-5 prepared by secondary synthesis, from the reaction of H-ZSM-5 with vapor phase TiCl4, was characterized with several physicochemical techniques including FT-IR and UV/VIS-DRS. It was found that zeolite structure, surface area and pore volume did not change, and the framework aluminum could not be replaced by titanium atom during the secondary synthesis of Ti-ZSM-5. The incorporation of titanium into the framework might be due to reaction of TiCl4 with the silanol groups associated with defects or surface sites. The formation of extra-framework titanium could not be avoided, unless the samples were further treated by water vapor at 550 degreesC or higher temperature. High temperature steam treatment of Ti-ZSM-5 prepared by chemical vapor deposition with TiCl4 was efficient to prevent the formation of non-framework titanium species. Ti-ZSM-5 zeolites prepared in this work contained only framework titanium species and exhibited improved catalytic property close to TS-1 prepared by hydrothermal synthesis.

• 出版日期2004-5-20
• 单位中国科学院成都有机化学有限公司