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Citation: SU Zhao-Hui, CHEN Qi-Yuan, LI Jie, LIU Shi-Jun. Preparation and Characterization of Mesoporous Silicon Dioxide Doped with Tungsten[J]. Acta Physico-Chimica Sinica, ;2007, 23(11): 1760-1764. doi: 10.3866/PKU.WHXB20071120 shu

Preparation and Characterization of Mesoporous Silicon Dioxide Doped with Tungsten

1.
School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China; Zhengzhou Research Institute of CHALCO, Zhengzhou 450041, P. R. China

Received Date: 7 May 2007
Available Online: 3 September 2007

Mesoporous silicon dioxide materials doped with tungsten were synthesized by hydrothermal technique, employing nonionic surfactant block copolymer (P123) as template, ethyl silicate (TEOS) as inorganic precursor and sodium tungstate (Na2WO4·2H2O) as the source of tungsten. Several methods such as XRD, HRTEM, EDX, FT-IR and nitrogen adsorption-desorption isotherms were employed to characterize the structure of the W-doped SiO2 mesoporous materials and the state of tungsten in the mesoporous materials. The results showed that the tungsten species in W-SiO2 was highly dispersed when the amount of WO3 was less than 10%; when the amount of WO3 was 20%, some WO3 crystal could be detected in W-SiO2. When the amount of WO3 was lower than 60%, well organized pore structures could still be detected in W-SiO2 material. As the amount of WO3 was more than 60%, the mesoprous structure was collapsed.
- Mesoporous materials; Tungsten oxide; Silicon dioxide; Template assemble method
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